MOS Technology 8568

Script error: No such module "Unsubst".

The VDC was designed with office suite applications in mind. Shown here is SpeedScript 128, a word processor.

The MOS Technology 8568 Video Display Controller (VDC) was the graphics processor responsible for the 80-column^[1] or RGBI display on the Commodore 128DCR personal computer.^[1]^[2]^[3]^[4]^[5] In the Commodore 128 service manual, this component was referred to as the “80 column CRT controller.” The 8568 incorporated many of the features of the older 6545E monochrome CRT controller, with the addition of RGBI color.^[2]

The original ("flat") Commodore 128 and the Commodore 128D (European plastic housing version) used the 8563 video controller to generate the 80-column display. The 8568 was essentially an updated version of the 8563, combining its functionality with glue logic that had previously been implemented using discrete components located near the 8563. Unlike the 8563, the 8568 included an unused (in the C-128) active low interrupt request line (/INTR), which was asserted when the "ready" bit in the 8568's status register changed from 0 to 1. Reading the control register would automatically deassert /INTR. Due to differences in pin assignments and circuit interfacing, the 8563 and 8568 are not electrically interchangeable.^[3]

The Commodore 128 had two video display modes, which were usually used singularly, but could be used simultaneously if the computer was connected to two compatible video monitors. The VIC-II chip, also found in the Commodore 64, was mapped directly into main memory—the video memory and CPUs (the 8502 and Z80A processors) shared a common 128 kB RAM, and the VIC-II control registers were accessed as memory locations (that is, they were memory mapped).

Unlike the VIC-II, the 8568 had its own local video RAM, 64K in the C-128DCR model (sold in North America) and, depending on the date of manufacture of the particular machine, either 16 or 64K in the C-128D model (marketed in Europe). Addressing the VDC's internal registers and dedicated video memory must be accomplished by indirect means. First, the program must tell the VDC which of its 37 internal registers is to be accessed. Next, the program must wait until the VDC is ready for access, after which a read or write on the selected internal register may be performed. The following code is typical of a register read:

         ldx #regnum       ;VDC register to access
         stx $d600         ;write to control register
 loop    bit $d600         ;check bit 7 of status register
         bpl loop          ;VDC not ready
         lda $d601         ;read from VDC register
         ...

The following code is typical of a register write operation:

         ldx #regnum       ;VDC register to write to
         stx $d600         ;write to control register
 loop    bit $d600         ;check bit 7 of status register
         bpl loop          ;VDC not ready
         sta $d601         ;write to VDC register
         ...

Owing to this somewhat cumbersome method of controlling the 8568, the maximum possible frame rate in bit-mapped mode is generally too slow for arcade-style action video games, in which bit-intensive manipulation of the display is required.

The final versions of the 8568 had the revision codes R9a or R9b appended to the part number, apparently indicating undocumented improvements.

Features

80 × 25 characters text resolution
720 × 700 pixels maximum video resolution^[6]
Interlaced up to 80 × 50 text, 640H × 480V bitmap
3 character modes: standard, semigraphic and graphic, double width & HiRes bitmap.
Output: digital RGBI with 16 colors or 16 gray shades, plus limited monochrome composite.
Features: Interlace mode, horizontal & vertical scrolling, Light pen input, hardware cursor, underline, blink, reverse video, 2 character sets of 256 each, update ready interrupt
Can access 64 KB of memory, programmable to interface either 4164/4464 or 4416 DRAM
48 pins, +5 Volt DC supply^[7]

Register listing

This information was adapted from the Commodore 128 Programmer's Reference Guide^[8]

Register	Hexadecimal	Bit 7	Bit 6	Bit 5	Bit 4	Bit 3	Bit 2	Bit 1	Bit 0	Description
0 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	HT7 Script error: No such module "Check for unknown parameters".	HT6 Script error: No such module "Check for unknown parameters".	HT5 Script error: No such module "Check for unknown parameters".	HT4 Script error: No such module "Check for unknown parameters".	HT3 Script error: No such module "Check for unknown parameters".	HT2 Script error: No such module "Check for unknown parameters".	HT1 Script error: No such module "Check for unknown parameters".	HT0 Script error: No such module "Check for unknown parameters".	Horizontal Total
1 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	HD7 Script error: No such module "Check for unknown parameters".	HD6 Script error: No such module "Check for unknown parameters".	HD5 Script error: No such module "Check for unknown parameters".	HD4 Script error: No such module "Check for unknown parameters".	HD3 Script error: No such module "Check for unknown parameters".	HD2 Script error: No such module "Check for unknown parameters".	HD1 Script error: No such module "Check for unknown parameters".	HD0 Script error: No such module "Check for unknown parameters".	Horizontal Displayed
2 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	HP7 Script error: No such module "Check for unknown parameters".	HP6 Script error: No such module "Check for unknown parameters".	HP5 Script error: No such module "Check for unknown parameters".	HP4 Script error: No such module "Check for unknown parameters".	HP3 Script error: No such module "Check for unknown parameters".	HP2 Script error: No such module "Check for unknown parameters".	HP1 Script error: No such module "Check for unknown parameters".	HP0 Script error: No such module "Check for unknown parameters".	Horizontal Sync Position
3 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	VW3 Script error: No such module "Check for unknown parameters".	VW2 Script error: No such module "Check for unknown parameters".	VW1 Script error: No such module "Check for unknown parameters".	VW0 Script error: No such module "Check for unknown parameters".	HW3 Script error: No such module "Check for unknown parameters".	HW2 Script error: No such module "Check for unknown parameters".	HW1 Script error: No such module "Check for unknown parameters".	HW0 Script error: No such module "Check for unknown parameters".	Vertical/Horizontal Sync Width
4 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	VT7 Script error: No such module "Check for unknown parameters".	VT6 Script error: No such module "Check for unknown parameters".	VT5 Script error: No such module "Check for unknown parameters".	VT4 Script error: No such module "Check for unknown parameters".	VT3 Script error: No such module "Check for unknown parameters".	VT2 Script error: No such module "Check for unknown parameters".	VT1 Script error: No such module "Check for unknown parameters".	VT0 Script error: No such module "Check for unknown parameters".	Vertical Total
5 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	Template:Sdash	Template:Sdash	Template:Sdash	VA4 Script error: No such module "Check for unknown parameters".	VA3 Script error: No such module "Check for unknown parameters".	VA2 Script error: No such module "Check for unknown parameters".	VA1 Script error: No such module "Check for unknown parameters".	VA0 Script error: No such module "Check for unknown parameters".	Vertical Adjust
6 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	VD7 Script error: No such module "Check for unknown parameters".	VD6 Script error: No such module "Check for unknown parameters".	VD5 Script error: No such module "Check for unknown parameters".	VD4 Script error: No such module "Check for unknown parameters".	VD3 Script error: No such module "Check for unknown parameters".	VD2 Script error: No such module "Check for unknown parameters".	VD1 Script error: No such module "Check for unknown parameters".	VD0 Script error: No such module "Check for unknown parameters".	Vertical Displayed
7 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	VP7 Script error: No such module "Check for unknown parameters".	VP6 Script error: No such module "Check for unknown parameters".	VP5 Script error: No such module "Check for unknown parameters".	VP4 Script error: No such module "Check for unknown parameters".	VP3 Script error: No such module "Check for unknown parameters".	VP2 Script error: No such module "Check for unknown parameters".	VP1 Script error: No such module "Check for unknown parameters".	VP0 Script error: No such module "Check for unknown parameters".	Vertical Sync Position
8 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	Template:Sdash	Template:Sdash	Template:Sdash	Template:Sdash	Template:Sdash	Template:Sdash	IM1 Script error: No such module "Check for unknown parameters".	IM0 Script error: No such module "Check for unknown parameters".	Interlace Mode
9 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	Template:Sdash	Template:Sdash	Template:Sdash	Template:Sdash	CTV4 Script error: No such module "Check for unknown parameters".	CTV3 Script error: No such module "Check for unknown parameters".	CTV2 Script error: No such module "Check for unknown parameters".	CTV1 Script error: No such module "Check for unknown parameters".	Character Total Vertical
10 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	Template:Sdash	CM1 Script error: No such module "Check for unknown parameters".	CM0 Script error: No such module "Check for unknown parameters".	CS4 Script error: No such module "Check for unknown parameters".	CS3 Script error: No such module "Check for unknown parameters".	CS2 Script error: No such module "Check for unknown parameters".	CS1 Script error: No such module "Check for unknown parameters".	CS0 Script error: No such module "Check for unknown parameters".	Cursor Mode, Cursor Start Scan Line
11 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	Template:Sdash	Template:Sdash	Template:Sdash	CE4 Script error: No such module "Check for unknown parameters".	CE3 Script error: No such module "Check for unknown parameters".	CE2 Script error: No such module "Check for unknown parameters".	CE1 Script error: No such module "Check for unknown parameters".	CE0 Script error: No such module "Check for unknown parameters".	Cursor End Scan Line
12 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	DS15 Script error: No such module "Check for unknown parameters".	DS14 Script error: No such module "Check for unknown parameters".	DS13 Script error: No such module "Check for unknown parameters".	DS12 Script error: No such module "Check for unknown parameters".	DS11 Script error: No such module "Check for unknown parameters".	DS10 Script error: No such module "Check for unknown parameters".	DS9 Script error: No such module "Check for unknown parameters".	DS8 Script error: No such module "Check for unknown parameters".	Display Start Address High Byte
13 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	DS7 Script error: No such module "Check for unknown parameters".	DS6 Script error: No such module "Check for unknown parameters".	DS5 Script error: No such module "Check for unknown parameters".	DS4 Script error: No such module "Check for unknown parameters".	DS3 Script error: No such module "Check for unknown parameters".	DS2 Script error: No such module "Check for unknown parameters".	DS1 Script error: No such module "Check for unknown parameters".	DS0 Script error: No such module "Check for unknown parameters".	Display Start Address Low Byte
14 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	CP15 Script error: No such module "Check for unknown parameters".	CP14 Script error: No such module "Check for unknown parameters".	CP13 Script error: No such module "Check for unknown parameters".	CP12 Script error: No such module "Check for unknown parameters".	CP11 Script error: No such module "Check for unknown parameters".	CP10 Script error: No such module "Check for unknown parameters".	CP9 Script error: No such module "Check for unknown parameters".	CP8 Script error: No such module "Check for unknown parameters".	Cursor Position High Byte
15 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	CP7 Script error: No such module "Check for unknown parameters".	CP6 Script error: No such module "Check for unknown parameters".	CP5 Script error: No such module "Check for unknown parameters".	CP4 Script error: No such module "Check for unknown parameters".	CP3 Script error: No such module "Check for unknown parameters".	CP2 Script error: No such module "Check for unknown parameters".	CP1 Script error: No such module "Check for unknown parameters".	CP0 Script error: No such module "Check for unknown parameters".	Cursor Position Low Byte
16 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	LPV7 Script error: No such module "Check for unknown parameters".	LPV6 Script error: No such module "Check for unknown parameters".	LPV5 Script error: No such module "Check for unknown parameters".	LPV4 Script error: No such module "Check for unknown parameters".	LPV3 Script error: No such module "Check for unknown parameters".	LPV2 Script error: No such module "Check for unknown parameters".	LPV1 Script error: No such module "Check for unknown parameters".	LPV0 Script error: No such module "Check for unknown parameters".	Light Pen Vertical Position
17 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	LPH7 Script error: No such module "Check for unknown parameters".	LPH6 Script error: No such module "Check for unknown parameters".	LPH5 Script error: No such module "Check for unknown parameters".	LPH4 Script error: No such module "Check for unknown parameters".	LPH3 Script error: No such module "Check for unknown parameters".	LPH2 Script error: No such module "Check for unknown parameters".	LPH1 Script error: No such module "Check for unknown parameters".	LPH0 Script error: No such module "Check for unknown parameters".	Light Pen Horizontal Position
18 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	UA15 Script error: No such module "Check for unknown parameters".	UA14 Script error: No such module "Check for unknown parameters".	UA13 Script error: No such module "Check for unknown parameters".	UA12 Script error: No such module "Check for unknown parameters".	UA11 Script error: No such module "Check for unknown parameters".	UA10 Script error: No such module "Check for unknown parameters".	UA9 Script error: No such module "Check for unknown parameters".	UA8 Script error: No such module "Check for unknown parameters".	Update Address High Byte
19 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	UA7 Script error: No such module "Check for unknown parameters".	UA6 Script error: No such module "Check for unknown parameters".	UA5 Script error: No such module "Check for unknown parameters".	UA4 Script error: No such module "Check for unknown parameters".	UA3 Script error: No such module "Check for unknown parameters".	UA2 Script error: No such module "Check for unknown parameters".	UA1 Script error: No such module "Check for unknown parameters".	UA0 Script error: No such module "Check for unknown parameters".	Update Address Low Byte
20 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	AA15 Script error: No such module "Check for unknown parameters".	AA14 Script error: No such module "Check for unknown parameters".	AA13 Script error: No such module "Check for unknown parameters".	AA12 Script error: No such module "Check for unknown parameters".	AA11 Script error: No such module "Check for unknown parameters".	AA10 Script error: No such module "Check for unknown parameters".	AA9 Script error: No such module "Check for unknown parameters".	AA8 Script error: No such module "Check for unknown parameters".	Attribute Start Address High Byte
21 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	AA7 Script error: No such module "Check for unknown parameters".	AA6 Script error: No such module "Check for unknown parameters".	AA5 Script error: No such module "Check for unknown parameters".	AA4 Script error: No such module "Check for unknown parameters".	AA3 Script error: No such module "Check for unknown parameters".	AA2 Script error: No such module "Check for unknown parameters".	AA1 Script error: No such module "Check for unknown parameters".	AA0 Script error: No such module "Check for unknown parameters".	Attribute Start Address Low Byte
22 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	CTH3 Script error: No such module "Check for unknown parameters".	CTH2 Script error: No such module "Check for unknown parameters".	CTH1 Script error: No such module "Check for unknown parameters".	CTH0 Script error: No such module "Check for unknown parameters".	CDH3 Script error: No such module "Check for unknown parameters".	CDH2 Script error: No such module "Check for unknown parameters".	CDH1 Script error: No such module "Check for unknown parameters".	CDH0 Script error: No such module "Check for unknown parameters".	Character Total Horizontal, Character Display Horizontal
23 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	Template:Sdash	Template:Sdash	Template:Sdash	CDV4 Script error: No such module "Check for unknown parameters".	CDV3 Script error: No such module "Check for unknown parameters".	CDV2 Script error: No such module "Check for unknown parameters".	CDV1 Script error: No such module "Check for unknown parameters".	CDV0 Script error: No such module "Check for unknown parameters".	Character Display Vertical
24 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	COPY Script error: No such module "Check for unknown parameters".	RVS Script error: No such module "Check for unknown parameters".	CBRATE Script error: No such module "Check for unknown parameters".	VSS4 Script error: No such module "Check for unknown parameters".	VSS3 Script error: No such module "Check for unknown parameters".	VSS2 Script error: No such module "Check for unknown parameters".	VSS1 Script error: No such module "Check for unknown parameters".	VSS0 Script error: No such module "Check for unknown parameters".	Vertical Smooth Scrolling
25 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	TEXT Script error: No such module "Check for unknown parameters".	ATR Script error: No such module "Check for unknown parameters".	SEMI Script error: No such module "Check for unknown parameters".	DBL Script error: No such module "Check for unknown parameters".	HSS3 Script error: No such module "Check for unknown parameters".	HSS2 Script error: No such module "Check for unknown parameters".	HSS1 Script error: No such module "Check for unknown parameters".	HSS0 Script error: No such module "Check for unknown parameters".	Horizontal Smooth Scrolling
26 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	FG3 Script error: No such module "Check for unknown parameters".	FG2 Script error: No such module "Check for unknown parameters".	FG1 Script error: No such module "Check for unknown parameters".	FG0 Script error: No such module "Check for unknown parameters".	BG3 Script error: No such module "Check for unknown parameters".	BG2 Script error: No such module "Check for unknown parameters".	BG1 Script error: No such module "Check for unknown parameters".	BG0 Script error: No such module "Check for unknown parameters".	Foreground/Background color
27 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	AI7 Script error: No such module "Check for unknown parameters".	AI6 Script error: No such module "Check for unknown parameters".	AI5 Script error: No such module "Check for unknown parameters".	AI4 Script error: No such module "Check for unknown parameters".	AI3 Script error: No such module "Check for unknown parameters".	AI2 Script error: No such module "Check for unknown parameters".	AI1 Script error: No such module "Check for unknown parameters".	AI0 Script error: No such module "Check for unknown parameters".	Address Increment per Row
28 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	CB15 Script error: No such module "Check for unknown parameters".	CB14 Script error: No such module "Check for unknown parameters".	CB13 Script error: No such module "Check for unknown parameters".	RAM Script error: No such module "Check for unknown parameters".	Template:Sdash	Template:Sdash	Template:Sdash	Template:Sdash	Character Base Address
29 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	Template:Sdash	Template:Sdash	Template:Sdash	UL4 Script error: No such module "Check for unknown parameters".	UL3 Script error: No such module "Check for unknown parameters".	UL2 Script error: No such module "Check for unknown parameters".	UL1 Script error: No such module "Check for unknown parameters".	UL0 Script error: No such module "Check for unknown parameters".	Underline Scan Line
30 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	WC7 Script error: No such module "Check for unknown parameters".	WC6 Script error: No such module "Check for unknown parameters".	WC5 Script error: No such module "Check for unknown parameters".	WC4 Script error: No such module "Check for unknown parameters".	WC3 Script error: No such module "Check for unknown parameters".	WC2 Script error: No such module "Check for unknown parameters".	WC1 Script error: No such module "Check for unknown parameters".	WC0 Script error: No such module "Check for unknown parameters".	Word Count
31 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	DA7 Script error: No such module "Check for unknown parameters".	DA6 Script error: No such module "Check for unknown parameters".	DA5 Script error: No such module "Check for unknown parameters".	DA4 Script error: No such module "Check for unknown parameters".	DA3 Script error: No such module "Check for unknown parameters".	DA2 Script error: No such module "Check for unknown parameters".	DA1 Script error: No such module "Check for unknown parameters".	DA0 Script error: No such module "Check for unknown parameters".	Data Register
32 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	BA15 Script error: No such module "Check for unknown parameters".	BA14 Script error: No such module "Check for unknown parameters".	BA13 Script error: No such module "Check for unknown parameters".	BA12 Script error: No such module "Check for unknown parameters".	BA11 Script error: No such module "Check for unknown parameters".	BA10 Script error: No such module "Check for unknown parameters".	BA9 Script error: No such module "Check for unknown parameters".	BA8 Script error: No such module "Check for unknown parameters".	Block Start Address High Byte
33 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	BA7 Script error: No such module "Check for unknown parameters".	BA6 Script error: No such module "Check for unknown parameters".	BA5 Script error: No such module "Check for unknown parameters".	BA4 Script error: No such module "Check for unknown parameters".	BA3 Script error: No such module "Check for unknown parameters".	BA2 Script error: No such module "Check for unknown parameters".	BA1 Script error: No such module "Check for unknown parameters".	BA0 Script error: No such module "Check for unknown parameters".	Block Start Address Low Byte
34 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	DEB7 Script error: No such module "Check for unknown parameters".	DEB6 Script error: No such module "Check for unknown parameters".	DEB5 Script error: No such module "Check for unknown parameters".	DEB4 Script error: No such module "Check for unknown parameters".	DEB3 Script error: No such module "Check for unknown parameters".	DEB2 Script error: No such module "Check for unknown parameters".	DEB1 Script error: No such module "Check for unknown parameters".	DEB0 Script error: No such module "Check for unknown parameters".	Display Enable Begin
35 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	DEE7 Script error: No such module "Check for unknown parameters".	DEE6 Script error: No such module "Check for unknown parameters".	DEE5 Script error: No such module "Check for unknown parameters".	DEE4 Script error: No such module "Check for unknown parameters".	DEE3 Script error: No such module "Check for unknown parameters".	DEE2 Script error: No such module "Check for unknown parameters".	DEE1 Script error: No such module "Check for unknown parameters".	DEE0 Script error: No such module "Check for unknown parameters".	Display Enable End
36 Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	Template:Sdash	Template:Sdash	Template:Sdash	Template:Sdash	DRR3 Script error: No such module "Check for unknown parameters".	DRR2 Script error: No such module "Check for unknown parameters".	DRR1 Script error: No such module "Check for unknown parameters".	DRR0 Script error: No such module "Check for unknown parameters".	DRAM Refresh Rate
37^[9] Script error: No such module "Check for unknown parameters".	Template:Mono Script error: No such module "Check for unknown parameters".	HSYNC Script error: No such module "Check for unknown parameters".	VSYNC Script error: No such module "Check for unknown parameters".	Template:Sdash	Template:Sdash	Template:Sdash	Template:Sdash	Template:Sdash	Template:Sdash	SYNC Polarity (undocumented)

Notes

<templatestyles src="Citation/styles.css"/>^ In Commodore 128 terminology, the VIC-II display was called the 40-column display, and the VDC, 80-column, due to the number of columns of fixed-pitch text that could be natively displayed.
<templatestyles src="Citation/styles.css"/>^ Commodore service manual 314001-08 (1987).
<templatestyles src="Citation/styles.css"/>^ The 8563/8568 hardware is always visible on the address and data buses regardless of which mode in which the C-128 is operating. Hence it is possible to generate an 80-column display while running in C-64 compatibility mode. There is, of course, no C-64 operating system support.

References

Template:Reflist

Script error: No such module "Navbox".

↑ Script error: No such module "citation/CS1".
↑ Script error: No such module "citation/CS1".
↑ Script error: No such module "citation/CS1".
↑ Script error: No such module "citation/CS1".
↑ Script error: No such module "citation/CS1".
↑ Script error: No such module "citation/CS1". Graphic Booster 128
↑ Script error: No such module "citation/CS1". 090425 geocities.com
↑ Commodore Capital, Inc., (1986). Commodore 128 programmer's reference guide. p.294, New York, NY: Bantam Books, Inc.
↑ Script error: No such module "citation/CS1".

[1] Script error: No such module "citation/CS1".

[2] Script error: No such module "citation/CS1".

[3] Script error: No such module "citation/CS1".

[4] Script error: No such module "citation/CS1".

[5] Script error: No such module "citation/CS1".

[c128_net-6] Script error: No such module "citation/CS1". Graphic Booster 128

[geocities_com-csg-7] Script error: No such module "citation/CS1". 090425 geocities.com

[CBM-8] Commodore Capital, Inc., (1986). Commodore 128 programmer's reference guide. p.294, New York, NY: Bantam Books, Inc.

[welte-9] Script error: No such module "citation/CS1".

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

MOS Technology 8568

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Register listing

Notes

References

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MOS Technology 8568

Features

Register listing

Notes

References

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