= HF8V = / = SP8WJT = / = SP0106RZ =

HF-12211

Project Data

PROJECT: HF-12211
DESCRIPTION: Microprocessor Module UPD7811
STATUS: q
PROJECT START DATE: 2024
LOCALISATION: PI
DOCUMENTATION: TM
PCB: TPD52911#5
MODULE DIMENSIONS: 90 x 70 mm

SOFTWARE VERSION: 0.01
HARDWARE VERSION: 1.01

CPU Data

CPU CATALOG NUMBER: UC-204
CPU: UPD7811
CPU BRAND: NEC
CPU FAMILY: 87AD
ROM: 4K (EXT 60K)
RAM: 256
MAX CLOCK: 12 MHz (1 MIPS)
THN ADDRESS: 0x67
UC TYPE: 0x3C

Project Info

Retro project on 1980's 87AD NEC microprocessor. I always wanted experiment with this UC. I already wrote some code in assembler for similiar UPD7810 (HF-17244#2) and now I want to test on myself-made module.
Instruction set for 87AD is very complex and interesting (comparing to 1980s technology), hardware rather simple comparing to our times, speed is veeery sloooow, but I dont care about it. It can still performs many tasks even on 1 MIPS...
Assembly is on universal TPD52911 and is almost completed but currently I working on many other projects and HF-12211 was delayed.
For external memory HF-10064 interface is used, what is compatible with HF-6423 and similiar RAM Loaders.

Components

Some additional equipment is present on TPD52911#5:

74373 data/bus demux

4094 shift register

74138 demux

buzzer

on/off switch

reset switch

control LED

Another 87AD projects

PROJECT	UC-###	MICROPROCESSOR NAME	REMARKS	THN ADR	TYPE
HF-12211	UC-204	UPD7811	8b, ROM4K, RAM256, 12MHz, ADR SPC 60K, EXT	0x67	0x3C
HF-17202	UC-213	UPD78C14	EXT	0xFC	0x3D
HF-17233	UC-211	UPD78C10	TK-013, EXT	0xEF	0x3B
HF-17244#1	UC-202	UPD7810	EXT	0xED	0x3B
HF-17244#2	UC-203	UPD7810	EXT	0xEE	0x3B
HF-17591	UC-332	UPD78C14		0xFB	0x3D

Sources

[1] UPD7811 documentation
[2] Notebook 'Mikroprocesory-2' p. 111-113, basic informations on architecture and assembler, basic code routines

Prefix 122

HF Register

Microcontrollers in my constructions

UC Database - my CPU collection

Electronics

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