FANDOM


MPFI
MPF1Closeup
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