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- MOS_Technology_8568 abstract "The 8568 Video Display Controller (VDC) was MOS Technology's graphics processor responsible for the 80 column or RGBI display on D[CR] models of the Commodore 128 personal computer. In the Commodore 128 service manual, this part was referred to as the \"80 column CRT controller.\" The 8568 embodied many of the features of the older 6545E monochrome CRT controller plus RGBI color.The original (\"flat\") C128 used the 8563 video controller to generate the 80 column display. The 8568 was essentially an updated version of the 8563, combining the latter's functionality with glue logic that previously was implemented by discrete components in physical proximity to the 8563. Unlike the 8563, the 8568 included an unused 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. Owing to differences in pin assignments and circuit interfacing, the 8563 and 8568 are not electrically interchangeable.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 the 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 registerloop 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 registerloop 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.".
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- MOS_Technology_8568 wikiPageWikiLink Bitmap.
- MOS_Technology_8568 wikiPageWikiLink Category:Commodore_64.
- MOS_Technology_8568 wikiPageWikiLink Category:Graphics_chips.
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- MOS_Technology_8568 wikiPageWikiLink Interrupt_request_(PC_architecture).
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- MOS_Technology_8568 wikiPageWikiLink MOS_Technology_8563.
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- MOS_Technology_8568 wikiPageWikiLink O.
- MOS_Technology_8568 wikiPageWikiLink Monochrome.
- MOS_Technology_8568 wikiPageWikiLink Motorola_6845.
- MOS_Technology_8568 wikiPageWikiLink Personal_computer.
- MOS_Technology_8568 wikiPageWikiLink RGBI_interface.
- MOS_Technology_8568 wikiPageWikiLink RGB_color_model.
- MOS_Technology_8568 wikiPageWikiLink Random-access_memory.
- MOS_Technology_8568 wikiPageWikiLink Scrolling.
- MOS_Technology_8568 wikiPageWikiLink Volt.
- MOS_Technology_8568 wikiPageWikiLink File:SpeedScript_128_in_action.png.
- MOS_Technology_8568 wikiPageWikiLinkText "8568 VDC".
- MOS_Technology_8568 wikiPageWikiLinkText "8568 [D]VDC".
- MOS_Technology_8568 wikiPageWikiLinkText "8568".
- MOS_Technology_8568 wikiPageUsesTemplate Sound.
- MOS_Technology_8568 wikiPageUsesTemplate Template:Note.
- MOS_Technology_8568 wikiPageUsesTemplate Template:Ref.
- MOS_Technology_8568 wikiPageUsesTemplate Template:Reflist.
- MOS_Technology_8568 subject Category:Commodore_64.
- MOS_Technology_8568 subject Category:Graphics_chips.
- MOS_Technology_8568 subject Category:MOS_Integrated_Circuits.
- MOS_Technology_8568 hypernym Processor.
- MOS_Technology_8568 type Software.
- MOS_Technology_8568 type Circuit.
- MOS_Technology_8568 type Computer.
- MOS_Technology_8568 comment "The 8568 Video Display Controller (VDC) was MOS Technology's graphics processor responsible for the 80 column or RGBI display on D[CR] models of the Commodore 128 personal computer. In the Commodore 128 service manual, this part was referred to as the \"80 column CRT controller.\" The 8568 embodied many of the features of the older 6545E monochrome CRT controller plus RGBI color.The original (\"flat\") C128 used the 8563 video controller to generate the 80 column display.".
- MOS_Technology_8568 label "MOS Technology 8568".
- MOS_Technology_8568 sameAs Q3841467.
- MOS_Technology_8568 sameAs MOS_DVDC.
- MOS_Technology_8568 sameAs m.08pnr5.
- MOS_Technology_8568 sameAs Q3841467.
- MOS_Technology_8568 wasDerivedFrom MOS_Technology_8568?oldid=669855232.
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- MOS_Technology_8568 isPrimaryTopicOf MOS_Technology_8568.