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NEC PC8801 for MiSTer Platform

This is the port of the PC8801 MKII SR core by Puu-san.

  • Thanks to Puu-san for the core
  • Thanks to Yosinda
  • Thanks for the help of Alanswx and Kitrinx
  • Thanks to Sorgelig

Features

  • Modes N, N88V1L, N88V1H, N88V2
  • CPU Speeds (4MHz and 8MHz)
  • 2 Floppy Drives using D88 format
  • Sound chip YM2603 by default and ADPCM
  • Mouse support (Changed between Mouse and Joypad on the OSD)

Installation

Copy the PC88_*.rbf file to the root of the SD card. Create a PC8801 folder on the root/games of the card, and place PC8801 floppies (*.D88) inside this folder.

  • boot.rom = PC8801 MKII SR BIOS file. Required to start the core.

How to build the boot.rom

  • 00000 ~ N88BASIC (32ko) mk2sr_n88.rom A0FC0473
  • 08000- N-BASIC (32ko) mk2sr_n80.rom 27E1857D
  • 10000 ~ N88 4th-0 (8ko) mk2sr_n88_0.rom 710A63EC
  • 12000 ~ N88 4th-1 (8ko) n88_1.rom C0BD2AA6
  • 14000 ~ N88 4th-2 (8ko) n88_2.rom AF2B6EFA
  • 16000 ~ N88 4th-3 (8ko) n88_3.rom 7713C519
  • 18000 ~ FONT (8x16) (2ko) + (2ko blank) font.rom 56653188
  • 19000- Simple graphics font (attached Font / graphfont.bin) (4ko) graphfont.bin CDD1BE6B
  • 1a000 ~ DISK ROM (8ko) + (16ko blank) mh_disk.rom A222ECF0
  • 20000 ~ KANJI1 (128ko) kanji1.rom 6178BD43
  • 40000 ~ KANJI2 (128ko) kanji2.rom 154803CC

copy /b mk2sr_n88.rom+mk2sr_n80.rom+mk2sr_n88_0.rom+n88_1.rom+n88_2.rom+n88_3.rom+font.rom+2KO_BLANK_00.ROM+graphfont.bin+mh_disk.rom+8KO_BLANK_00.ROM+8KO_BLANK_00.ROM+kanji1.rom+kanji2.rom boot.rom

Special key assignments are as follows:

(PC88->PS/2)

  • STOP -> End
  • CLR -> Home
  • HELP -> F11
  • GRPH -> Alt
  • COPY -> Print Screen
  • PC -> Scroll Lock

Sound Board II

On the OSD, there is an option to choose between Expansion (Default) or Onboard because some software only supports Onboard or Expansion board. You could find more informations on this issue ticket #11.

Known Issues

  • Timing issues
  • Gamma correction doesn't seem to change anything (?)

TODO

  • Update T80 cpu
  • Add choice Sound YM2203 or YM2603 on the OSD
  • Add Audio Mix
  • Add support of multi-resolution
  • Add support of tapes
  • Add support of other models like PC8801MC
  • ...