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Last modified on 15 August 2010, at 21:55

Amstrad DMP1 printer

Revision as of 21:55, 15 August 2010 by Nocash (Talk | contribs)

Amstrads first printer. DMP Stands for Dot Matrix Printer.

A very basic unit which had no descenders on letters such as y,j,q, or p, leaving for a very strange looking printout. This could be corrected (when using TasWord), but using the TasPrint program, but the effect was often not totally satisfactory.

It took only tractor feed paper and had no option or ability to accept single feed sheet.

Ribbons were tiny in comparison to other makes and ran out very quickly - they were, however, very easy to re-ink a few times.

Technical

This printer is a rebadged SEIKOSHA GP-500M-2.

It has a 2732 EPROM labelled 8DE-1 a 6116 RAM and a NEC 8039H CPU.

The following ICs are labelled on the PCB: 

P1 = 74LS04
P2 = 74LS374
P3 = 74LS32
P4 = 74LS373
P5 = 6116 RAM (2k*8 static RAM)
P6 = 2003
P7 = 8039H CPU (MCS-48 family of 8-bit microcontrollers, on-chip oscillator, 2 8-bit timers, 27 i/o ports and 128 bytes of RAM. Requires external ROM to operate)
P8 = 2732 ROM (8DE-1)
P9 = 7404
P10 = 74LS74
P11 = Intel 8243 (MCS-48 INPUT/OUTPUT EXPANDER)
P12 = 2732 EPROM (32k -4kb*8) (NOT FITTED)
SW1 dipswitch (accessible on outside)
two fuses

Pictures

  • Printer

  • Printer

  • Printer with top open

  • Printer (back showing centronics connector and DIP switches)

  • Printer (inside)

  • Printer PCB

  • Printer label

Seikosha GP500 Series

The Seikosha GP500 Series was offered for various homecomputers, around 1984-1985. All models support 10" endless paper. The case-design is more or less identical, though differently coloured, and badged with different manufacturer & model names.

  • Seikosha GP500A - Was offered as Seikosha GP500A for general purpose (centronics port)
  • Seikosha GP500AS - Was offered as Seikosha GP500AS for general purpose (serial rs232 port)
  • Seikosha GP500M-2 - Was offered as Amstrad DMP1 for CPC (centronics 36pin port)
  • Seikosha GP500VC - Was offered as Commodore MPS-801 for VIC20 and C64 (commodore 6pin serial port)
  • Seikosha GP500AT-1 - Was offered as Atari 1029 for Atari XL (dual 13pin port)

The main difference is that the PCBs are customized - the VC and AT models have non-centronics connectors. The ROMs might be also customized, possibly containing different character sets (?), and most probably different protocols (for the serial-port VC version at least).

Note: The name "Seikosha GP 500M-2" is printed on the PCB, in the internet, it's often referred to as "Seikosha GP 500 CPC".

DMP1 Pinouts

1 /STROBE
2..8 DATA1..7
9 DO NOT USE (DATA 8)
10 /ACK
11 BUSY
12 LOW
13 NC
14-16 GND
17 CHASSIS GND
18 +5V 8mA Max.
19-29 Twisted Pair GND (pair with pin 1-11)
30 GND
31 /INITIAL (pair with pin14)
32 /ERROR (pair with pin15)
33 GND
34 NC
35 /TEST (pair with pin16)
36 NC

Manuals