= HF8V = / = SP8WJT = / = SP0106RZ =

HF-17244

PROJECT: HF-17244
DESCRIPTION: A4185616A (PRINTER?)
BRAND: RICOH
STATUS: 1u, 1n
PROJECT START DATE: near 2015
LOCALISATION: PD, PL
DOCUMENTATION: B-8 str. 29-30, 37, DVC
PCB: TPD57244, TPD58244
CPU CATALOG NUMBER: UC-202, UC-203
CPU BRAND: NEC
CPU FAMILY: 87AD (uCOM87)
ARCHITECTURE: 8b
THN ADDRESS: 0xEE, 0xED
UC TYPE: 0x3B
EXT ROM: 60K
RAM: 256
MAX CLOCK: 12 MHz (1 MIPS)
MODULE DIMENSIONS: 240x90 (TPD57244), 155x90 (TPD58244)

HF-17244#2 (modified)

Modules:

PROJECT	STATUS	USAGE	PCB	UC-###	THN ADR	HARDWARE VER.	SOFTWARE VER.	LOC.	REMARKS
HF-17244#1	n	reserve/tests	TPD57244	UC-202	0xEE	1.0	0.01	PD	not modified
HF-17244#2	u	reserve/tests	TPD58244	UC-203	0xED	2.1	0.02	PL	cutted from original module (power elements removed)

Project Info

First I recreated circuit diagram for this module (in paper notebook B-8 p. 29, 30, 37), this was crucial for understanding how programm it (service manual is not avalaible as I know).
HF-17244#1 is hold intact while HF-17244#2 is modified version of original module:
1/ power, supply and other not necessary elements cutted off and disassembled
2/ DIP28 memory socket changed to DIP32 and few paths rerouted (I'm using typical DIP32 flash memory here)

I made various tests and experiments on this module, writing some code in assembler.
It was also interesting to download and analyze original 1980's software, I learned some 87AD architecture tricks from here.
See [2] for more hardware details.

Sources:
[1] UPD7810
[2] PROJECT FILE

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