This is the MPF 1B, basic specification:
| CPU |
Z80 |
|
Speed |
2.5Mhz |
|
Word Length |
8 bit |
|
ROM |
2k |
|
RAM |
2k |
|
Graphic Modes |
0 |
|
Text Modes |
6 digits |
|
Colours |
1 |
|
Date |
1979 |
As far as I am able to discover MPF-I has two variants distinguished only by the board version number, PB820010-9A and higher had an upgraded ROM which provided a larger address space. My variant is the later one as you can see from the PB number on the board pictured opposite.
The full hardware spec is as follows:
- CPU - Zilog Z-80 with 158 Instructions, 2.5MHz max clock rate, system clock 1.79 MHz
- ROM - Single +5v EPROM 2k or 4k
- RAM - Static RAM 2k
- Memory Expansion - Single +5v EPROM or Static RAM (2k-4k)
- I/O Port -
- Programmable I/O port - 24 parallel I/O lines for keyboard scan and LED display control
- Programmable P10 - 16 parallel I/O lines
- Programmable CTC - 4 counter timers
- Display - 6 digit 7 segment red LED
- Keyboard - 36 keys - 19 Function, 16 hex-decimal keys and 1 user definable key
- Speaker - 2.25" diameter
- User Expansion - On the right of the board was a 1.36" x 3.5" wire wrapping area
- Audio Tape Interface - 165 Baud transfer rate
- System Clock Rate - 3.58MHz crystal divided by 2
- Power consumption - Single 5v supply, consumption 5mA
- Dimensions - 15.75cm x 22.30cms