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| '''NES-MHROM''' is a board of the [[GxROM]] family cartridge boards.
| | #REDIRECT [[GxROM]] |
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| == Overview ==
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| * PRG ROM size: 64 KB
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| * PRG ROM bank size: 32 KB
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| * PRG RAM: None
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| * CHR capacity: 8 KB, 16 KB or 32 KB ROM
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| * CHR bank size: 8 KB
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| * Nametable [[mirroring]]: Solder pads select vertical or horizontal mirroring
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| * Subject to [[bus conflict]]s: Yes
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| == Banks ==
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| * CPU $8000-$FFFF: 32 KB switchable PRG ROM bank
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| * PPU $0000-$1FFF: 8 KB switchable CHR ROM bank
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| The MHROM board always have 2 PRG ROM banks, and 1, 2 or 4 CHR ROM banks.
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| [[Category:Cartridge Boards]]
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| == Solder pad config ==
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| * Horizontal mirroring : 'H' disconnected, 'V' connected.
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| * Vertical mirroring : 'H' connected, 'V' disconnected.
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| == Chips and pinouts ==
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| * PRG ROM - 512 kBit (64 KB x 8) (DIP-28)
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| ---_---
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| A15 - |01 28| - +5V
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| A12 - |02 27| - A14
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| A7 - |03 26| - A13
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| A6 - |04 25| - A8
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| A5 - |05 24| - A9
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| A4 - |06 23| - A11
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| A3 - |07 22| - /OE (/ROMSEL)
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| A2 - |08 21| - A10
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| A1 - |09 20| - GND (/CE ?)
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| A0 - |10 19| - D7
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| D0 - |11 18| - D6
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| D1 - |12 17| - D5
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| D2 - |13 16| - D4
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| GND - |14 15| - D3
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| -------
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| This pinout is compatible with standard 27C512 EPROMs, no rewiring needed.
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| * CHR ROM - 256 kBit (32 KB x 8) (DIP-28)
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| ---_---
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| +5V - |01 28| - +5V
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| A12 - |02 27| - A14
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| A7 - |03 26| - A13
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| A6 - |04 25| - A8
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| A5 - |05 24| - A9
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| A4 - |06 23| - A11
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| A3 - |07 22| - /OE (/RD)
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| A2 - |08 21| - A10
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| A1 - |09 20| - /CE (CHR A13)
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| A0 - |10 19| - D7
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| D0 - |11 18| - D6
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| D1 - |12 17| - D5
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| D2 - |13 16| - D4
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| GND - |14 15| - D3
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| -------
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| This pinout is compatible with standard 27C256 EPROMs, as well with 27C128 (16 KB) and 27C64 (8 KB). No rewiring is needed at all.
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