= HF8V = / = SP8WJT = / = SP0106RZ =

HF-17612

PROJECT: HF-17612
DESCRIPTION: Main board RICOH A2035103D
BRAND: RICOH
STATUS: n
PROJECT START DATE:
LOCALISATION: DD
DOCUMENTATION: partly recreated(DVC), part list [1][2]
PCB: TPD57612
DIMENSIONS: 161x156 mm
MEMORY CATALOG NUMBER: MM-089, MM-612
HARDWARE VERSION: 1.00

CPU: RF5A93
CPU BRAND: RICOH
RICOH CODE: A1845105
FAMILY: ?
EXT ROM: ? (128KB at least)
RAM: ?
MAX CLOCK: (9.83 MHz at least)
SUPPLY VOLTAGE: 5V
CASE: QFP100
CPU CATALOG NUMBER: UC-307
THN ADDRESS: 0x0B
UC TYPE: 0x60

Project Info

RICOH A203 copier main board. Another 'secret' UC, but I think these 'secrets' can be revealed by analyzing software because it is external memory system.

Update: I already read MM-089 succesfully (I made some error during previous reading) but code is strange. I'm trying to decode it but it is not HITACHI H8/300, WDC 65C816 or 10-12 most popular machine codes, which I'm typically using... But at least it looks like a machine code (some sequences are repeating). Ten most popular bytes are: 0xE0, 0x08, 0x0A, 0x0B, 0x10, 0x01, 0x0C, 0x0E, 0x90, 0x02. What is important low bytes are over-represented here. Probably it is something like NEC V8xxx but I dont know exactly which extension...

Meanwhile circuit diagram is being recreated what is complicated and time consuming task but that knowledge is important to write own software [4]...

Sources:

[1] Ricoh Skylark A183 A184 Parts Manual - part1
[2] Ricoh Skylark A183 A184 Parts Manual - part2
[3] HF-17612 Device File
[4] Electric circuit (partly recreated)
[5] RF5A93 pins
[6] Original EPROM code (MM-089) (RICOH A2035108F)

Prefix 17

HF Register

Microcontrollers in my constructions

UC Database - my CPU collection

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