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

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

Known Issues

Timing issues
Gamma correction doesn't seem to change anything (?)
Some floppy formats are not implemented (like for Xak Series, ...)
Some games have severe graphical issues (Like Fangs, Snatcher during the intro, ...)

TODO