/* Imported from Wayback Machine
   Original URL : https://www.retrobrewcomputers.org/doku.php?id=builderpages:plasmo:vga65:vga65pcb_r0
   Snapshot date: 2024-11-09
   Generator    : wayback-archiver
*/

==== Table of Contents ====

[[#vga65_rev0_bare-bone_25mhz_standalone_6502_computer|VGA65 Rev0, Bare-bone 25MHz Standalone 6502 Computer]]

[[#introduction|Introduction]]

[[#features|Features]]

[[#design_files|Design Files]]

[[#software|Software]]

====== VGA65 Rev0, Bare-bone 25MHz Standalone 6502 Computer ======

===== Introduction =====

VGA65 started out as a beam racing experiment that generated static 640×480 monochorme image with 6502 overclocked to 25.175MHz. Slowly the design evolved into a standalone 6502 computer with VGA, PS2 keyboard, serial port, and CF interface. There are several generations of prototypes leading to this experimental PC board.

Online discussions about VGA65: [[http://forum.6502.org/viewtopic.php?f=4&t=6517|6502 as VGA controller]] on 6502.org and [[https://groups.google.com/g/retro-comp/c/NlLsPXgX550|6502 or Z80 as VGA controller]] on Google forum retro-comp

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=482cb7&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/vga65/vga65_r0_annotated.jpg|{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=600&h=447&tok=0a597f&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fvga65%2Fvga65_r0_annotated.jpg?600x447|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_vga65_vga65_r0_annotated.jpg}}]]

===== Features =====

W65C02 overclocked to 25.175MHz

128Kx8 RAM, two banks

CF disk interface

EPM7064S CPLD

Bit bang serial port, 115200N82

PS2 keyboard interface

Monochrome 640×480 VGA

===== Design Files =====

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:vga65:vga65_r0pcb_scm.pdf|Schematic]]

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:vga65:vga65_r0_gerber.zip|Gerber photoplots]]

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:vga65:vga65_r0pcb_cpld_rev1_2024_ps2_autovsync.zip|CPLD design files]]

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:vga65:vga65r1n2_cpld_top_scm.pdf|Schematic of CPLD]] design in PDF format

==== Software ====

VGA65Mon, basic monitor for VGA65

VGA65 demo