VACS:Projects:Hardware:z80board
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Project: Z80 Board connected to the French minitel Date: 1988-1987
Contents |
Introduction
Hardware
In 1987, I've designed a small Z80 board that I could connect to a French minitel. The z80 board had:
- A z80 cpu running at 2.4576Mhz.
- A z80 dma (in fact I've never succeeded in using it (-:)
- A z80 sio (1200 baud for minitel)
- 8Kb of EPROM (2x2732)
- 2Kb of CMOS ram, transformed into 8Kb of CMOS battery saved ram on an expansion board.
- The z80 board was realized in wrapping technic.
The prom monitor took 4Kb and I've used ancien programming technics with hand assembling, binary copying from one eprom to the other to insert code or do patches.
Screenshots
Schemas
Schemas are available but they are written by hand.
- Address decoder
- Clock and Parity checker
- Peripherials
- VACS:Projects:Hardware:z80board:Ram board
- VACS:Projects:Hardware:z80board:Ram board battery
