main
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Last change
on this file since 4e47de3 was 4e47de3, checked in by Adrien Destugues <pulkomandy@…>, 3 years ago |
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Gemini: add GALs files
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Property mode
set to
100644
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File size:
553 bytes
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| 1 | GAL22V10 Gemini2
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| 2 | Gemini21
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| 3 |
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| 4 | IORQ D7 D6 D5 D4 D3 XD2 XD1 XD0 A14 A15 GND
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| 5 | RESET WR CRTC RMR2 ASIC UNLOCK RAMDIS XA15 XA14 RAMWR MMR VCC
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| 6 |
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| 7 | MMR = IORQ + WR + A15 + /A14 + /D6 + /D7
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| 8 | RMR2 = UNLOCK * /IORQ * /WR * /A15 * A14 * D7 * /D6 * D5
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| 9 | ASIC.R = RMR2 * D4 * D3 * RESET + /RMR2 * ASIC * RESET
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| 10 | RAMWR = WR + ASIC * /A15 * A14
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| 11 | XA14 = A14 * /XD2 + XD0 * XD2
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| 12 | XA15 = A15 * /XD2 + XD1 * XD2
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| 13 | RAMDIS = /XD2 * XD0 * A15 * A14 + /XD2 * XD1 * /XD0 + XD2 * /A15 * A14
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| 14 | CRTC = IORQ + WR + A14
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| 15 |
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| 16 | DESCRIPTION:
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| 17 | Miscelaneous decoder for Gemini RAM extension
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