Модернизация YIS-503 IIIR в почти MSX 2+

[SeaBirdDK]

И на фотографиях в http://www.msx.org/wiki/Panasonic_FS-A1GT#Gallery вижу только R800,

Отдельно на фотографиях проца нет, потому, что он внутри большой квадратной микросхемы TOSHIBA T9769.
В Tubro-R ядром системы являются два чипа TOSHIBA T9769 + S-1990, ну и главной процессор R-800
Внутри T9769:
main CPU, a Zilog Z80 clone with a clock speed of 3,58 MHz (MSX2; switchable to 5,36 MHz on some MSX2+ machines)
a Programmable Sound Generator - sound chip, compatible with a General Instrument AY-3-8910
parallel I/O chip: backward compatible with the Intel i8255
MSX1 and MSX2-functions (MSX2-computers)
MSX2+-functions (MSX2+-computers)

Внутри S-1990:
Controller
For the ASCII R800 processor
For the Z80 processor inside the T9769 MSX-Engine
For Zilog Z80-timing emulation
For MSX-cartridge slot management, -memory control and I/O address decoder
For memory access, I/O control, RFSH#/M1#-simulation
For access to programmable peripherals (The S-1990 does not include these peripherals, they are contained within the T9769, but it controls access to them, and in particular it slows down the R800 CPU when accessing these peripherals, especially when accessing the VDP).
Programmable Peripheral Interface compatible with the Intel i8255-PPI
MegaRom-mapper
DRAM-mapper
Kanji ROM-interface
system timer
Sound chip
Programmable Sound Generator, compatible with the General Instrument AY-3-8910
pulse code modulation (PCM)
PCM-sampling
Video Display Controller: Yamaha V9958
floppy disk-interface
For the execution of kernel functions
For the pause function
http://en.wikipedia.org/wiki/S-1990
http://en.wikipedia.org/wiki/MSX-Engine