ZMJC Computer: Difference between revisions
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== Introduction == | == Introduction == | ||
During my MSc in Electronic Engineering at The University of Nottingham (1992-3) we used this single | During my [https://www.nottingham.ac.uk/pgstudy/course/taught/electrical-and-electronic-engineering-msc 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: | Key features: | ||
* Z80180 CPU ( | * [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 | * 8 KB RAM (32 KB or 128 KB options) | ||
* 8 bit switch input | * 8 bit switch input | ||
* 8 bit LED output | * 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. | 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 [https://en.wikipedia.org/wiki/Yamaha_Y8950 Y8950] | |||
* 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 | |||
* 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 == | ||
CON1 | {| class="wikitable" | ||
!Pin | |||
!Function | |||
!Pin | |||
!Function | |||
|- | |||
|+CON1: ADC Input / DAC Output | |||
|1a||DAC V<sub>ref</sub>||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|| | |||
|} | |||
{| class="wikitable" | {| class="wikitable" | ||
Line 25: | Line 57: | ||
!Function | !Function | ||
|- | |- | ||
|+ | |+CON2: Expansion Bus | ||
|1a|| ||1b|| | |1a|| ||1b|| | ||
|- | |- | ||
Line 41: | Line 73: | ||
|- | |- | ||
|8a|| ||8b|| | |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|| | |||
|} | |} | ||
= | {| class="wikitable" | ||
!Pin | |||
!Function | |||
!Pin | |||
!Function | |||
|- | |||
|+CON3: RS232 (25 pin D-Type) | |||
|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|| | |||
|- | |||
{| class="wikitable" | {| class="wikitable" | ||
Line 54: | Line 150: | ||
|- | |- | ||
|+CON4: Power | |+CON4: Power | ||
| | |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: | Jumpers: | ||
* RESET: | * RESET: Close to reset | ||
* RAMSIZE: 8 | * RAMSIZE: 8 KB or 32 KB/128 KB | ||
== Memory Map == | == Memory Map == | ||
Line 84: | Line 180: | ||
|+Main Memory | |+Main Memory | ||
|- | |- | ||
|8000H|| ||RAM | |8000H||27FFFH<br/>FFFFH<br/>9FFFH||128 KB RAM<br/>32 KB RAM<br/>8 KB RAM | ||
|- | |- | ||
|0000H||7FFFH||ROM | |0000H||7FFFH||32 KB ROM | ||
|- | |- | ||
|} | |} | ||
Line 95: | Line 191: | ||
|- | |- | ||
|+IO Ports | |+IO Ports | ||
|98H||LED Output | |||
|- | |||
|90H||Switch Input | |90H||Switch Input | ||
|- | |- | ||
|88H||DAC Output | |88H||DAC Output | ||
|- | |- | ||
|87H||ADC Input | |87H||ADC Input 8 | ||
|- | |- | ||
|86H||ADC Input 7 | |86H||ADC Input 7 | ||
Line 116: | Line 214: | ||
|- | |- | ||
|} | |} | ||
Z180 Internal IO Ports: 00 - 3FH | |||
== Circuit Description == | == Circuit Description == | ||
== Software == | == Software == | ||
TBC | TBC |
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