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- MOS_Technology_VIC abstract "The VIC (Video Interface Chip), specifically known as the MOS Technology 6560 (NTSC version) / 6561 (PAL version), is the integrated circuit chip responsible for generating video graphics and sound in the Commodore VIC-20 home computer. It was originally designed for applications such as low cost CRT terminals, biomedical monitors, control system displays and arcade or home video game consoles.The chip was designed by Al Charpentier in 1977 but Commodore could not find a market for the chip. In 1979 MOS Technology began work on a video chip named MOS Technology 6564 intended for the TOI computer and had also made some work on another chip, MOS 6562 intended for a color version of the Commodore PET. Both of these chips failed due to memory timing constraints (both required very fast and thus expensive SRAM, making them unsuitable for mass production). Before finally starting to use the VIC in the VIC-20, chip designer Robert Yannes fed features from the 6562 (a better sound generator) and 6564 (more colors) back to the 6560, so before beginning mass production for the VIC-20 it had been thoroughly revised.Its features include: 16 kB address space for screen, character and color memory (only 5 kB points to RAM on the VIC-20 without a hardware modification) 16 colors (the upper 8 can only be used in the global background and auxiliary colors) two selectable character sizes (8×8 or 8×16 bits; the pixel width is 1 bit for \"hires\" characters and 2 bits for \"multicolor\" characters) maximum video resolution depends on the television system (176 × 184 is the standard for the VIC-20 firmware, although at least 224 × 256 is possible on the PAL machine) 4 channel sound system (3 square wave + \"white\" noise + global volume setting) on-chip DMA two 8-bit A/D converters light pen supportUnlike many other video circuits of the era, it does not offer dynamic RAM refresh capabilities. Thus the VIC-20 employed the more expensive static RAM chips; but with the low RAM capacity of that machine, just 5 KB in the main box, that didn't matter too much. Memory expansions for the VIC-20 either used SRAM as well or implemented their own refresh circuit.The VIC was programmed by manipulating its 16 control registers, memory mapped to the range $9000–$900F in the VIC-20 address space. The on-chip A/D converters were used for dual paddle position readings by the VIC-20, which also used the VIC's light pen facility. The VIC preceded the much more advanced VIC-II, used by the VIC-20's successors, the C64 and C128.VIC-20s with expansion RAM have their video memory (550 bytes) at $1000 and when it is not present, $1E00. User-defined character sets must be placed within the first 5k of system RAM. The default PETSCII character ROM is at $8000 and each character takes 8 bytes to store. Up to 128 characters may be used at any one time. While the PET had a backslash (\\) in its character set, this was replaced on the VIC-20 (and all subsequent Commodore machines) with a British pound sign (£).Programmable characters are the only way of creating graphics and animation on the VIC as the chip does not have sprites or an all-points-addressable bitmap mode. Of the 16 colors in the palette, eight may be used for the foreground (per the color RAM at $9400) and border while the others are limited to the background and auxiliary multicolors. The MSB of the color RAM is a flag used to indicate if that character is multicolor or high resolution. Due to the extreme blockiness of the former, most VIC-20 games use hires characters.The VIC does not support scrolling or raster interrupts like on the VIC-II, but the scanline counters could be polled for a specific point on the screen to produce raster effects. This feature was rarely used in games except for a few titles like iMagic's Demon Attack.Sound programming on the VIC is done by placing a frequency value in one of the four registers at $900A-$900D (they are turned off by writing a zero to them). The first three are square wave generators pitched half an octave from each other and the fourth is for white noise.".
- MOS_Technology_VIC thumbnail MOS_6560_pinout.svg?width=300.
- MOS_Technology_VIC wikiPageExternalLink 6561d.txt.
- MOS_Technology_VIC wikiPageExternalLink 6561.txt.
- MOS_Technology_VIC wikiPageExternalLink 6560.zip.
- MOS_Technology_VIC wikiPageID "302670".
- MOS_Technology_VIC wikiPageLength "7905".
- MOS_Technology_VIC wikiPageOutDegree "39".
- MOS_Technology_VIC wikiPageRevisionID "679795910".
- MOS_Technology_VIC wikiPageWikiLink Al_Charpentier.
- MOS_Technology_VIC wikiPageWikiLink Analog-to-digital_converter.
- MOS_Technology_VIC wikiPageWikiLink Arcade_game.
- MOS_Technology_VIC wikiPageWikiLink Category:Commodore_VIC-20.
- MOS_Technology_VIC wikiPageWikiLink Category:Graphics_chips.
- MOS_Technology_VIC wikiPageWikiLink Category:MOS_Integrated_Circuits.
- MOS_Technology_VIC wikiPageWikiLink Category:Sound_chips.
- MOS_Technology_VIC wikiPageWikiLink Cathode_ray_tube.
- MOS_Technology_VIC wikiPageWikiLink Commodore_128.
- MOS_Technology_VIC wikiPageWikiLink Commodore_64.
- MOS_Technology_VIC wikiPageWikiLink Commodore_PET.
- MOS_Technology_VIC wikiPageWikiLink Commodore_VIC-20.
- MOS_Technology_VIC wikiPageWikiLink Computer_terminal.
- MOS_Technology_VIC wikiPageWikiLink Direct_memory_access.
- MOS_Technology_VIC wikiPageWikiLink Dynamic_random-access_memory.
- MOS_Technology_VIC wikiPageWikiLink Home_computer.
- MOS_Technology_VIC wikiPageWikiLink Integrated_circuit.
- MOS_Technology_VIC wikiPageWikiLink Light_pen.
- MOS_Technology_VIC wikiPageWikiLink List_of_home_computers_by_video_hardware.
- MOS_Technology_VIC wikiPageWikiLink MOS_Technology.
- MOS_Technology_VIC wikiPageWikiLink MOS_Technology_VIC-II.
- MOS_Technology_VIC wikiPageWikiLink Memory_refresh.
- MOS_Technology_VIC wikiPageWikiLink NTSC.
- MOS_Technology_VIC wikiPageWikiLink PAL.
- MOS_Technology_VIC wikiPageWikiLink Paddle_(game_controller).
- MOS_Technology_VIC wikiPageWikiLink Programmable_sound_generator.
- MOS_Technology_VIC wikiPageWikiLink Robert_Yannes.
- MOS_Technology_VIC wikiPageWikiLink Video_display_controller.
- MOS_Technology_VIC wikiPageWikiLink Video_game_console.
- MOS_Technology_VIC wikiPageWikiLink File:MOS_6560_pinout.svg.
- MOS_Technology_VIC wikiPageWikiLinkText "6560 Video Interface Chip (VIC)".
- MOS_Technology_VIC wikiPageWikiLinkText "6560".
- MOS_Technology_VIC wikiPageWikiLinkText "6561".
- MOS_Technology_VIC wikiPageWikiLinkText "6562".
- MOS_Technology_VIC wikiPageWikiLinkText "MOS Technology 6560 "VIC"".
- MOS_Technology_VIC wikiPageWikiLinkText "MOS Technology 6560 (NTSC) and 6561 (PAL)".
- MOS_Technology_VIC wikiPageWikiLinkText "MOS Technology 6560/6561".
- MOS_Technology_VIC wikiPageWikiLinkText "MOS Technology VIC".
- MOS_Technology_VIC wikiPageWikiLinkText "VIC chip".
- MOS_Technology_VIC wikiPageWikiLinkText "VIC".
- MOS_Technology_VIC wikiPageWikiLinkText "Video Interface Chip".
- MOS_Technology_VIC wikiPageWikiLinkText "video chip".
- MOS_Technology_VIC wikiPageUsesTemplate Sound.
- MOS_Technology_VIC subject Category:Commodore_VIC-20.
- MOS_Technology_VIC subject Category:Graphics_chips.
- MOS_Technology_VIC subject Category:MOS_Integrated_Circuits.
- MOS_Technology_VIC subject Category:Sound_chips.
- MOS_Technology_VIC hypernym Chip.
- MOS_Technology_VIC type Circuit.
- MOS_Technology_VIC type Computer.
- MOS_Technology_VIC type Redirect.
- MOS_Technology_VIC comment "The VIC (Video Interface Chip), specifically known as the MOS Technology 6560 (NTSC version) / 6561 (PAL version), is the integrated circuit chip responsible for generating video graphics and sound in the Commodore VIC-20 home computer. It was originally designed for applications such as low cost CRT terminals, biomedical monitors, control system displays and arcade or home video game consoles.The chip was designed by Al Charpentier in 1977 but Commodore could not find a market for the chip.".
- MOS_Technology_VIC label "MOS Technology VIC".
- MOS_Technology_VIC sameAs Q970039.
- MOS_Technology_VIC sameAs MOS_Technology_VIC.
- MOS_Technology_VIC sameAs MOS_Technology_VIC.
- MOS_Technology_VIC sameAs MOS_Technology_VIC.
- MOS_Technology_VIC sameAs MOS_VIC.
- MOS_Technology_VIC sameAs MOS_Technology_VIC.
- MOS_Technology_VIC sameAs MOS_Technology_VIC.
- MOS_Technology_VIC sameAs m.01s2n2.
- MOS_Technology_VIC sameAs MOS_Technology_VIC.
- MOS_Technology_VIC sameAs MOS_Technology_VIC.
- MOS_Technology_VIC sameAs Q970039.
- MOS_Technology_VIC wasDerivedFrom MOS_Technology_VIC?oldid=679795910.
- MOS_Technology_VIC depiction MOS_6560_pinout.svg.
- MOS_Technology_VIC isPrimaryTopicOf MOS_Technology_VIC.