Amstrads first printer. DMP Stands for Dot Matrix Printer. Manufactured by [[Seikosha]].
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.
Ribbons were tiny in comparison to other makes and ran out very quickly - they were, however, very easy to re-ink a few times.
== General Specifications ==
For (detailed) general information about Amstrad/Scheider printers, see:
{{AmstradPrinterLinks}}
== Technical ==
P3 = 74LS32
P4 = 74LS373
P5 = 6116 HM6116P-4 (2K*8 static RAM)
P6 = 2003
P7 = 8039H NEC uPD8039LC (8bit CPU, 27 I/O Lines, 128 bytes RAM) 8039 Details: MCS-48 family of 8-bit microcontrollers, on-chip oscillator, two 8-bit timers, 27 i/o ports, and 128 bytes of RAM. Requires external ROM to operate (unlike 8049) P8 = 2732 ROM EPROM (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
SW1 dipswitch (accessible on outside) two fuses <br>== Pictures ==
<gallery>
Image:DMP1_5.jpg|Printer PCB
Image:DMP1_6.jpg|Printer label
Image:Amstrad DMP-1 Ribbon.jpg|Ribbon
Image:ACU840809-032.jpg|Advert (ACU 8/9 1984)
Image:ACU841011-002.jpg|Advert (ACU 10/11 1984)
Image:DMP1_GP-500M-2_PCB_Top.jpg|PCB Version 2 Top (600dpi)
Image:DMP1_GP-500M-2_PCB_Bottom.jpg|PCB Version 2 Bottom (600dpi)
Image:DMP1_PCB_Top.jpg|PCB Version 3 Top (300dpi)
Image:DMP1_PCB_Bottom.jpg|PCB Version 3 Bottom (300dpi)
</gallery>
* 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) (plus 2K SRAM) (BIOS: 8DE-1)* Seikosha GP500VC - Was offered as '''Commodore MPS-801''' for VIC20 and C64 (commodore 6pin serial port) ([[Media:Commodore MPS801 Printer Manual.txt|manual]]) (90-byte buffer, no 2K SRAM)* Seikosha GP500AT-1 - Was offered as '''Atari 1029''' for Atari XL (dual 13pin port) ([[:File:Atari1029 Printer.jpg|printer photo]], [[:File:Atari1029 PCB.jpg|pcb photo]]) (no 2K SRAM) (BIOS: 8AT-1)
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). Some versions include 2K SRAM buffers, others don't. The Commodore version supports inverse mode, the CPC doesn't support this.
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 Control Codes ==
chr(0Ah) CR+LF
chr(0Dh) CR or CR+LF (switch-selectable)
chr(14h) CR
chr(0Eh) Double Width Mode (also restores 1/6" line feed rate; after graphics printing)
chr(0Fh) Normal Width Mode (also restores 1/6" line feed rate; after graphics printing)
chr(10h),"NN" Print Position in character units (NN = two-digit ASCII, "00..79")
chr(1Bh,10h,hi,lo) Print Position in dot units (hi:lo = 9bit binary, 0..479) (lo=lower 7bit, hi=upper 2bit)
chr(1Bh,4Bh,hi,lo,gfx0,gfx1,..) Graphics Mode (hi:lo = 9bit count, 0..479) (followed by as many bytes, with bit0=upper pixel .. bit6=lower pixel)
chr(1Ch,num,gfx) Repetition of one byte of graphic print data
* Character Mode: 6 lines/inch
* Graphics Mode: 9 lines/inch (each "line" containing 7 pixels vertically) - after Graphics printing: required to issue chr(0Eh) or chr(0Fh) to return to 6 lines/inch mode
== DMP1 Pinouts ==
36pin Centronics
----------------
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
DIP Switches
------------
SW1,SW2,SW3 Character Set (USA,UK,Germany,Sweden,France,Denmark,Italy,Spain)
SW4 Select CR or CR+LF for chr(0Dh)
== Reviews ==
* ACU 8/9-1984, pages [[:File:ACU840809-013.jpg|13]],[[:File:ACU840809-014.jpg|14]],[[:File:ACU840809-019.jpg|19]],[[:File:ACU840809-020.jpg|20]]. And ACU 4-1985, page [[:File:Amstrad Computer User8504 026.jpg|26]]
== Manuals ==
* [[Media:Amstrad DMP1 Owners Manual.pdf]] - User Manual (includes programming info with ESC codes etc.)
* [[Media:Amstrad DMP1 Service Manual.pdf]] - Service Manual (schematics and mechanics)
* [[Media:S968ap14.pdf|SOFT 968 Appendix 14 (XIV) (Printer Translation Table)]] - Amstrad's official (but rather confusing) info about DMP1 character translations
* [[Media:UPD8039HLC Datasheet.pdf|uPD8039HLC Datasheet]] (HLC apparently means a High-speed/HMOS version, aside from that it's probably compatible with the LC version)
* [[Media:HM6116 Datasheet.pdf|HM6116 Datasheet]] (2Kx8 RAM)
== Downloads ==
* [[Media:DMP18DE1.ZIP|DMP-1 Rom Dump (8DE-1)]] (zipped rom file)
* [[Media:DMP18DE2.ZIP|DMP-1 Rom Dump (8DE-2)]] (zipped rom file)
[[Category:Peripherals]] [[Category:Printers_and_printer_ports]] [[Category:Stub]]