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--- builderpages:plasmo:crc65:vga6448r2 [2025/02/12 16:30] – Revision from 2025-02-12
+++ builderpages:plasmo:crc65:vga6448r2 [2026/06/15 13:06] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+/* Imported from Wayback Machine
+   Original URL : https://retrobrewcomputers.org/doku.php?id=builderpages:plasmo:crc65:vga6448r2
+   Snapshot date: 2025-11-17
+   Generator    : wayback-archiver
+*/
+====== VGA6448, A Text-based Monochrome VGA display, Rev2 ======
+===== Introduction =====
+VGA6448 is initially discussed on 6502.org forum [[http://forum.6502.org/viewtopic.php?f=10&t=6502|here]]: It is designed as a video expansion board for RC6502 based computer.
+This is link to [[builderpages:plasmo:crc65:vga6448|prototype VGA6448]]
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=20b590&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/crc65/vga64/dsc_66441026.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/crc65/vga64/dsc_66441026.jpg?600x355|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_crc65_vga64_dsc_66441026.jpg}}]]
+===== Features =====
+Two EPM7064S or ATF1504AS CPLD
+K dual port RAM
+.175MHz clock
+RC6502 expansion bus
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=39b6b4&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/crc65/vga64/dsc_66411026.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/crc65/vga64/dsc_66411026.jpg?500x307|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_crc65_vga64_dsc_66411026.jpg}}]]
+===== Design Information =====
+[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:crc65:vga64:vga6448r2_scm.pdf|Schematic]]
+[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:crc65:vga64:vga6448_gerber_rev2.zip|Gerber photoplot]]
+Bill of Materials
+Engineering changes
+CPLD design files
+CPLD design file for U1, [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:crc65:vga64:vga_generator_cpld_vga6448r2.zip|VGA generator]]
+CPLD design file for U3, [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:crc65:vga64:ps2kbd_cpld_vga6448r2.zip|PS2 Keyboard state machine]]
+==== Software ====
+Interim release of [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:crc65:vga64:crcmon_0_9b_interim_release.zip|CRCMon v0.9b]]. Commands can be entered either via terminal emulator or PS2 keyboard. Data displayed are sent to both VGA monitor as well as terminal emulator.