ZMJC Computer: Difference between revisions
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Key features: | Key features: | ||
* [https://en.wikipedia.org/wiki/Zilog_Z180 Z80180] CPU ([https://en.wikipedia.org/wiki/Zilog_Z80 Z80] compatible) running at 6 MHz (12 MHz crystal) | * [https://en.wikipedia.org/wiki/Zilog_Z180 Z80180] CPU ([https://en.wikipedia.org/wiki/Zilog_Z80 Z80] compatible) running at 6.1440 MHz (12.2880 MHz crystal) | ||
* 256 KB EPROM | * 256 KB EPROM | ||
* 8 KB RAM (32 KB or 128 KB options) | * 8 KB RAM (32 KB or 128 KB options) | ||
| Line 17: | Line 17: | ||
Long-term extensions: | Long-term extensions: | ||
* Expand to 1 MB RAM | * Expand to 1 MB RAM | ||
* | * Sound, eg [https://en.wikipedia.org/wiki/Yamaha_Y8950 Y8950] | ||
* Voice synthesiser, eg [https://en.wikipedia.org/wiki/Texas_Instruments_LPC_Speech_Chips TMS5220] | * Voice synthesiser, eg [https://en.wikipedia.org/wiki/Texas_Instruments_LPC_Speech_Chips TMS5220] | ||
* | * Video out, eg [https://en.wikipedia.org/wiki/TMS9918 TMS9918], [https://en.wikipedia.org/wiki/Yamaha_V9938 V9938] | ||
* | * Keyboard controller, eg VT8242 | ||
* Storage controller (eg FDD with GM82C765B controller). | * Realtime clock, eg Epson RTC7242, TI BQ4845 or DS1307 | ||
* Storage controller (eg FDD with GM82C765B or WDC37C65 controller). | |||
* SPI and/or I2C interface | |||
== Connectors == | == Connectors == | ||
| Line 32: | Line 34: | ||
|- | |- | ||
|+CON1: ADC Input / DAC Output | |+CON1: ADC Input / DAC Output | ||
|1a|| ||1b|| | |1a||DAC V<sub>ref</sub>||1b||DAC Out | ||
|- | |- | ||
|2a|| ||2b|| | |2a||Gnd||2b||+5 V DC | ||
|- | |- | ||
|3a|| ||3b|| | |3a|| ||3b|| | ||
|- | |- | ||
|4a|| ||4b|| | |4a||Gnd||4b||Gnd | ||
|- | |- | ||
|5a|| ||5b|| | |5a|| ||5b|| | ||
| Line 44: | Line 46: | ||
|6a|| ||6b|| | |6a|| ||6b|| | ||
|- | |- | ||
|7a|| ||7b|| | |7a||Gnd ||7b|| | ||
|- | |- | ||
|8a|| ||8b|| | |8a||+5 V DC||8b|| | ||
|} | |} | ||
| Line 150: | Line 152: | ||
|1a||+5 V DC||1a||+5 V DC | |1a||+5 V DC||1a||+5 V DC | ||
|- | |- | ||
|2a|| | |2a||Gnd||2b||Gnd | ||
|- | |- | ||
|3a|| ||3b|| | |3a|| ||3b|| | ||
| Line 156: | Line 158: | ||
|4a|| ||4b|| | |4a|| ||4b|| | ||
|- | |- | ||
|5a|| ||5b|| | |5a||^RESET||5b|| | ||
|- | |- | ||
|6a|| ||6b|| | |6a|| ||6b|| | ||
| Line 162: | Line 164: | ||
|7a|| ||7b|| | |7a|| ||7b|| | ||
|- | |- | ||
|8a|| ||8b|| | |8a||Gnd||8b||Gnd | ||
|} | |} | ||
| Line 189: | Line 191: | ||
|- | |- | ||
|+IO Ports | |+IO Ports | ||
|98H||LED Output | |||
|- | |||
|90H||Switch Input | |90H||Switch Input | ||
|- | |- | ||
Latest revision as of 10:12, 13 October 2024
Introduction
During my MSc in Electrical and Electronic Engineering at The University of Nottingham (1992-3) we used this single board computer for an assembly language programming module. It must have been designed by one of the university staff, but I can't remember who; it is just labelled "© 1991 MJC". Hence, I will refer to this as the ZMJC Computer. I lost the schematic many years ago.
Key features:
- Z80180 CPU (Z80 compatible) running at 6.1440 MHz (12.2880 MHz crystal)
- 256 KB EPROM
- 8 KB RAM (32 KB or 128 KB options)
- 8 bit switch input
- 8 bit LED output
- RS232 option
- ZN559 DAC option
- AD7828 or ACD0809 ADC option
It is intended that this page will ultimately document the schematic and repoducible PCB layout after I have reverse engineered it.
Long-term extensions:
- Expand to 1 MB RAM
- Sound, eg Y8950
- Voice synthesiser, eg TMS5220
- Video out, eg TMS9918, V9938
- Keyboard controller, eg VT8242
- Realtime clock, eg Epson RTC7242, TI BQ4845 or DS1307
- Storage controller (eg FDD with GM82C765B or WDC37C65 controller).
- SPI and/or I2C interface
Connectors
| Pin | Function | Pin | Function |
|---|---|---|---|
| 1a | DAC Vref | 1b | DAC Out |
| 2a | Gnd | 2b | +5 V DC |
| 3a | 3b | ||
| 4a | Gnd | 4b | Gnd |
| 5a | 5b | ||
| 6a | 6b | ||
| 7a | Gnd | 7b | |
| 8a | +5 V DC | 8b |
| Pin | Function | Pin | Function |
|---|---|---|---|
| 1a | 1b | ||
| 2a | 2b | ||
| 3a | 3b | ||
| 4a | 4b | ||
| 5a | 5b | ||
| 6a | 6b | ||
| 7a | 7b | ||
| 8a | 8b | ||
| 9a | 9b | ||
| 10a | 10b | ||
| 11a | 11b | ||
| 12a | 12b | ||
| 13a | 13b | ||
| 14a | 14b | ||
| 15a | 15b | ||
| 16a | 16b | ||
| 17a | 17b | ||
| 18a | 18b | ||
| 19a | 19b | ||
| 20a | 20b | ||
| 21a | 21b | ||
| 22a | 22b | ||
| 23a | 23b | ||
| 24a | 24b | ||
| 25a | 25b |
| Pin | Function | Pin | Function |
|---|---|---|---|
| 1a | 1b | ||
| 2a | 2b | ||
| 3a | 3b | ||
| 4a | 4b | ||
| 5a | 5b | ||
| 6a | 6b | ||
| 7a | 7b | ||
| 8a | 8b | ||
| 9a | 9b | ||
| 10a | 10b | ||
| 11a | 11b | ||
| 12a | 12b | ||
| 13a | 13b |
| Pin | Function | Pin | Function |
|---|---|---|---|
| 1a | +5 V DC | 1a | +5 V DC |
| 2a | Gnd | 2b | Gnd |
| 3a | 3b | ||
| 4a | 4b | ||
| 5a | ^RESET | 5b | |
| 6a | 6b | ||
| 7a | 7b | ||
| 8a | Gnd | 8b | Gnd |
Jumpers:
- RESET: Close to reset
- RAMSIZE: 8 KB or 32 KB/128 KB
Memory Map
| Start | End | Function |
|---|---|---|
| 8000H | 27FFFH FFFFH 9FFFH |
128 KB RAM 32 KB RAM 8 KB RAM |
| 0000H | 7FFFH | 32 KB ROM |
| Port | Function |
|---|---|
| 98H | LED Output |
| 90H | Switch Input |
| 88H | DAC Output |
| 87H | ADC Input 8 |
| 86H | ADC Input 7 |
| 85H | ADC Input 6 |
| 84H | ADC Input 5 |
| 83H | ADC Input 4 |
| 82H | ADC Input 3 |
| 81H | ADC Input 2 |
| 80H | ADC Input 1 |
Z180 Internal IO Ports: 00 - 3FH
Circuit Description
Software
TBC