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| Both sides previous revisionPrevious revisionNext revision | Previous revision |
| builderpages:plasmo:dpram [2023/10/02 09:51] – Revision from 2023-10-02 | builderpages:plasmo:dpram [2026/06/15 13:06] (current) – external edit 127.0.0.1 |
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| /* Imported from Wayback Machine | /* Imported from Wayback Machine |
| Original URL : https://retrobrewcomputers.org/doku.php?id=builderpages:plasmo:dpram | Original URL : https://www.retrobrewcomputers.org/doku.php?id=builderpages:plasmo:dpram |
| Snapshot date: 2023-10-02 | Snapshot date: 2025-12-16 |
| Generator : wayback-archiver | Generator : wayback-archiver |
| */ | */ |
| ===== Design Information ===== | ===== Design Information ===== |
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| [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:dpram:dpram_scm_r0.pdf|Schematic]] | [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:dpram:dpram_scm_r0.pdf|Schematic]] |
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| [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:dpram:dpram_gerber_proto_r0.zip|Gerber photoplots]] | [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:dpram:dpram_gerber_proto_r0.zip|Gerber photoplots]] |
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| [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:dpram:dpram_cpld_template.zip|CPLD design]] ← this is CPLD template with correct pin assignments. DPRAM base address is 0x40; release Z80 reset by writing to I/O 0xF4. | [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:dpram:dpram_cpld_template.zip|CPLD design]] ← this is CPLD template with correct pin assignments. DPRAM base address is 0x40; release Z80 reset by writing to I/O 0xF4. |
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| ===== Design Examples ===== | ===== Design Examples ===== |
| ==== Testing a newly assembled DPRAM board ==== | ==== Testing a newly assembled DPRAM board ==== |
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| Program the CPLD with the [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:dpram:dpram_cpld_template.zip|CPLD template]]. | Program the CPLD with the [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:dpram:dpram_cpld_template.zip|CPLD template]]. |
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| load [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:dpram:test_software_for_new_dpram_board.zip|DPRAM_tst]] and run from 0x1000. Read I/O port 0x40; the value should be changing constantly. | load [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:dpram:test_software_for_new_dpram_board.zip|DPRAM_tst]] and run from 0x1000. Read I/O port 0x40; the value should be changing constantly. |
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| ==== Game of Life accelerator ==== | ==== Game of Life accelerator ==== |
| Engineering change | Engineering change |
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| [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:dpram:dpram_life_coprocessor.zip|CPLD design]] | [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:dpram:dpram_life_coprocessor.zip|CPLD design]] |
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| [[software:start|Software]] | [[software:start|Software]] |
