/* Imported from Wayback Machine
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   Snapshot date: 2025-04-30
   Generator    : wayback-archiver
*/

==== Table of Contents ====

[[#vga65_prototype_rev1_6502_as_vga_controller|VGA65 Prototype Rev1, 6502 As VGA Controller]]

[[#introduction|Introduction]]

[[#features|Features]]

[[#theory_of_operation|Theory of Operation]]

[[#design_information|Design Information]]

[[#software|Software]]

====== VGA65 Prototype Rev1, 6502 As VGA Controller ======

===== Introduction =====

VGA65 rev1 is an updated version of [[builderpages:plasmo:crc65:vga65|VGA65 prototype]]. It restored the CF interface removed in VGA65. There is room for 2nd bank of memory and possible PS2 keyboard interface. Here are [[http://forum.6502.org/viewtopic.php?f=4&t=6517|discussions about VGA65 prototype]].

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=92770a&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/vga65/dsc_75450110.jpg|{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=600&h=325&tok=8fa5ba&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fvga65%2Fdsc_75450110.jpg?600x325|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_vga65_dsc_75450110.jpg}}]]

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=e71cf4&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/vga65/dsc_75460110.jpg|{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=600&h=340&tok=c53add&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fvga65%2Fdsc_75460110.jpg?600x340|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_vga65_dsc_75460110.jpg}}]]

===== Features =====

W65C02 at 25.175MHz

128K RAM

640×480 monochrome VGA

CF interface

Bit-bang serial port, 115200N82

===== Theory of Operation =====

Place holder

===== Design Information =====

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:vga65:vga65_r1_scm.pdf|Schematic]]

CPLD design file

PDF file of [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:vga65:vga65_r1_cpld_top_scm.pdf|top level CPLD design file]]

Engineering changes

==== Software ====

Monitor

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:vga65:vga65r1_prototype_cf_image_monitor_low_r0.zip|CF image file]] contains bootstrap in master boot record and the monitor

Demonstration software for [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:vga65:v4a_released_vgatext16_r1_with_autovsync.zip|displaying spiral ASCII texts]].

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=1ecba7&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/vga65/dsc_7549-ezgif.com-optimize.gif|{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=492&h=279&tok=6b13ac&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fvga65%2Fdsc_7549-ezgif.com-optimize.gif?492x279}}]]