builderpages:plasmo:vga65:vga65r1 [RetroBrew Computers Wiki]

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====== 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/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/vga65/dsc_75450110.jpg?direct&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/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/vga65/dsc_75460110.jpg?direct&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 =====

{{:builderpages:plasmo:vga65:vga65_r1_scm.pdf|Schematic}}

CPLD design file

  * PDF file of {{:builderpages:plasmo:vga65:vga65_r1_cpld_top_scm.pdf|top level CPLD design file}}

Engineering changes

==== Software ====

Monitor

{{: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 {{: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/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/vga65/dsc_7549-ezgif.com-optimize.gif?direct&492x279}}]]