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| builderpages:plasmo:vgaxram:2-boards:with-ps2 [2025/05/16 07:12] – Revision from 2025-05-16 | builderpages:plasmo:vgaxram:2-boards:with-ps2 [2026/06/15 13:15] (current) – external edit 127.0.0.1 |
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| | /* Imported from Wayback Machine |
| | Original URL : https://retrobrewcomputers.org/doku.php?id=builderpages:plasmo:vgaxram:2-boards:with-ps2 |
| | Snapshot date: 2024-12-07 |
| | Generator : wayback-archiver |
| | */ |
| | |
| | ====== VGA Expansion for 128KB RAM, 2-board stack (with PS2 interface) ====== |
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| | This link to [[builderpages:plasmo:vgaxram:2-boards:no-ps2|2-board stack without PS2 interface]] |
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| | [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=99a7a1&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/vgaxram/2-boards/dsc_70220827.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/vgaxram/2-boards/dsc_70220827.jpg?600x504|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_vgaxram_2-boards_dsc_70220827.jpg}}]] |
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| | [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=59e7a8&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/vgaxram/2-boards/dsc_70230827.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/vgaxram/2-boards/dsc_70230827.jpg?600x562|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_vgaxram_2-boards_dsc_70230827.jpg}}]] |
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| | ===== Features ===== |
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| | Plug in existing 128KB RAM socket |
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| | 25.175MHz pixel clock, 60Hz VGA |
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| | 4K dual port RAM for video memory and font lookup tables |
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| | 64-macrocell CPLD, EPM7064SLC44 |
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| | 64 columns, 48 rows of 8×8 pixel monochrome text |
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| | Video RAM can be written any time |
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| | PS2 keyboard interface |
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| | ===== Design Files ===== |
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| | [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:vgaxram:2-boards:rambase_r1_scm.pdf|Schematic]] of RAM base board with PS2 CPLD |
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| | [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:vgaxram:2-boards:vgaxram_r1_scm.pdf|Schematic]] of dual-port VGA board |
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| | [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:vgaxram:2-boards:rambase_r1_gerber.zip|Gerber photoplots]] of RAM base board with PS2 CPLD |
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| | [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:vgaxram:2-boards:vgaxramr1_gerber.zip|Gerber photoplots]] of dual-port VGA board |
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