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HF-17706


PROJECT: HF-17706
DESCRIPTION: Display VFD + keyboard + MCU + EEPROM
TYPE: 503-550A
BRAND: ?
STATUS: n
PROJECT START DATE: 2012
LOCALISATION: WU
DOCUMENTATION: nil
PCB: TPD57706
DIMENSIONS:

CPU CATALOG NUMBER: UC-392
CPU: M50745
CPU BRAND: MITSUBISHI
FAMILY: MELPS740
ROM: 6144
RAM: 192
MAX CLOCK: 4 MHz
THN ADDRESS: 0x27
TYPE: 0xB6

MEMORY MODULE CATALOG NUMBER: MM-491
DISPLAY CATALOG NUMBER: WS-006



Project Info

This is front panel of some ancient VCR. Also very ancient EEPROM is used here M58653 (it needs -33V from VFD). I doubt if it still working because technology in 1980s was not good as today, and I remember that similiar EEPROM from TELEFUNKEN TV failed already in 1990s... but I will check it.

uC is interesting and extendable to 64KB well-known family MELPS740 so I can create my own digital system on it... I already experimenting with similiar M50744 in project HF-12244.

Through the years I gathered small collection of MELPS740 microcontrollers, mainly from old consumer and bureau electronics:

UC-### MICROPROCESSOR NAME BRAND NAME FAMILY
(SUBFAMILY, CORE)		 DISPOSITION REMARKS THN ADR TYPE
UC-197 M50754 MITSUBISHI MELPS740 reserve ROM6144, RAM192, 4MHz, EXT 0x05 0xB6
UC-293 M38002 MITSUBISHI MELPS740 (3800) HF-17243 2MIPS, EXT 0x51 0xB6
UC-391 M50744 MITSUBISHI MELPS740 HF-12244 8b, ROM4K, RAM144, CLK 4MHz, ADR SPC 64K, EXT 0x2B 0xB6
UC-392 M50745 MITSUBISHI MELPS740 HF-17706 ROM6144, RAM192, 4MHz, EXT 0x27 0xB6
UC-526 DMB5208 (M50754) DAEWOO MELPS740 HF-17589->reserve ROM6144, RAM192, 4MHz, EXT 0x56 0xB6

Another MELPS740 retro systems are quite possible, but thats not concrete plans yet. I already wrote some assembler code in ASL and I found this rather well-made instruction set. I also wrote my own macro assembler but it is still not debugged.


Sources:
[1] M50745 datasheet
[2] M58653 datasheet
[3] MELPS740 Programming Manual
[4] MELPS740 Instructions


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