ZMJC Computer: Difference between revisions
Jump to navigation
Jump to search
NickPGSmith (talk | contribs) (Created page with "== Introduction == During my MSc in Electronic Engineering at The University of Nottingham (1992-3) we used this single boad computer It is intended that this page will ultimately document the scematic and repoducible PCB layout after I have reverse engineered it. == Connectors, options and Ports == === CON1 (ADC/DAC) === === CON2 (Expansion) === === CON3 (RS232) === === CON4 (Power) === == Circuit Description == TBC == Software === TBC") |
NickPGSmith (talk | contribs) |
||
(49 intermediate revisions by the same user not shown) | |||
Line 1: | Line 1: | ||
== 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: | |||
* [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 | |||
* 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 [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 or TI BQ4845 | |||
* Storage controller (eg FDD with GM82C765B controller). | |||
== | == Connectors == | ||
= | {| 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" | ||
!Pin | |||
!Function | |||
!Pin | |||
!Function | |||
|- | |||
|+CON2: Expansion Bus | |||
|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|| | |||
|} | |||
{| 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" | |||
!Pin | |||
!Function | |||
!Pin | |||
!Function | |||
|- | |||
|+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: | |||
* RESET: Close to reset | |||
* RAMSIZE: 8 KB or 32 KB/128 KB | |||
== Memory Map == | |||
{| class="wikitable" | |||
!Start | |||
!End | |||
!Function | |||
|- | |||
|+Main Memory | |||
|- | |||
|8000H||27FFFH<br/>FFFFH<br/>9FFFH||128 KB RAM<br/>32 KB RAM<br/>8 KB RAM | |||
|- | |||
|0000H||7FFFH||32 KB ROM | |||
|- | |||
|} | |||
{| class="wikitable" | |||
!Port | |||
!Function | |||
|- | |||
|+IO Ports | |||
|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 == | == Circuit Description == | ||
== Software == | |||
== Software | |||
TBC | TBC |
Latest revision as of 10:06, 16 August 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 or TI BQ4845
- Storage controller (eg FDD with GM82C765B controller).
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