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

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

• Modes N, N88V1L, N88V1H, N88V2
• CPU Speeds (4MHz and 8MHz)
• 2 Floppy Drives using D88 format
• Sound chip YM2603 by default and ADPCM (incomplete)

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.

• 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

• Timing issues
• Gamma correction doesn't seem to change anything (?)
• Some floppy formats are not implemented (like for YS1, YS2, ...)
• ADPCM (incomplete)
• Some games have severe graphical issues

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