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.
<br>== General Specifications ==
[[For (detailed) general information about Amstrad/Scheider printers, see:{{AmstradPrinterLinks}} == 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 = HM6116P-4 (2K*8 static RAM) P6 = 2003 P7 = 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 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 == Pictures == <gallery>Image:DMP-1 Printer.JPG|framePrinterImage:DMP1_1.jpg|centerPrinterImage:DMP1_2.jpg|480pxPrinter with top openImage:DMP1_3.jpg|Printer (back showing centronics connector and DIP switches)Image:DMP1_4.jpg|Printer (inside)Image:DMP1_5.jpg|Printer PCBImage:DMP1_6.jpg|Printer labelImage:Amstrad DMP-1_Printer1 Ribbon.JPGjpg|RibbonImage: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 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) (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]]