Click Here to visit our Sponsor
The Latest News ! The History of Computing The Magazine Forums Collectors corner Have Fun there ! Buy books and goodies
  Click here to loginLogin Click here to print the pagePrinter ViewClick here to send a link to this page to a friendTell a FriendTell us what you think about this pageRate this PageMistake ? You have mr info ? Click here !Add Info     Search     Click here use the advanced search engine

Amstrad

NC 200
Browse console museumBrowse pong museum









 

Space Invaders - Retro Gamer goodies !

see details
READY prompt goodies !

see details
Camputers Lynx logo goodies !

see details
Oric Atmos goodies !

see details
MSX Retro Gamer goodies !

see details
www.old-computers.com logo goodies !

see details
Amiga Workbench goodies !

see details
Odyssey 2 / Videopac sprites goodies !

see details
Odyssey 2 / Videopac Select Game prompt goodies !

see details
Space Invaders goodies !

see details
Amstrad CPC-464 goodies !

see details
H.E.R.O. goodies !

see details
Apple II goodies !

see details
ZX Spectrum goodies !

see details
Atari ST bomb icons goodies !

see details
Commodore VIC-20 goodies !

see details
MZ-700 goodies !

see details
Pixel adventurer goodies !

see details
Commodore 64 boot screen goodies !

see details
Destroy all humanoids ! goodies !

see details
Atari ST bee icon goodies !

see details
1kb memory only...sorry goodies !

see details
I love my Oric-1 goodies !

see details
Commodore 64 goodies !

see details
Horace is not dead goodies !

see details
Back to the roots goodies !

see details







M > MULTITECH  > MPF-III/312     


MULTITECH
MPF-III/312

After the MPF 2, compatible with the Apple II+, Multitech introduced the MPF3 in 1983 at the Las Vegas CES. It was compatible with the Apple IIe but, like the MPF2, had no real success.

The MPF-III was released in two versions. The initial one was the /312 which used PALs and LSTTL logic. Later the /327 version was released and this used MMU and IOU ASIC chips just like the Apple IIe. The /327 may also have had 128KB of DRAM on the motherboard (MPF-III computers do not have an Aux slot so cannot have memory added in this fashion).

Slots 1-7 were configured like this:

1 (virtual) Built-in Parallel Printer port - support for Epson, C-Itoh and CP-80 printers
2 (external) accepts standard Apple II cards
3 (virtual) Built-in 80 Column Card - Apple IIe compatible
4 (internal) Reserved for optional Chinese Character Generator card
5 (non-existent)
6 (internal) Reserved for optional Floppy Disk Interface
7 (internal) Reserved for optional Z-80 CP/M card

ProDOS did not work (unpatched) on the MPF-III/312 for two reasons:
1) Apple put a test in the ProDOS initialization code that looks for the string APPLE in the monitor ROM. The MPF-III ROMs did not have this string. A one byte patch to the PRODOS file fixed this.
2) The Apple IIe came in 3 memory configurations - 64KB, 65KB (with 80 column text card) and 128KB (with 64KB 80 column card). ProDOS checks for more than 1KB of Aux RAM and if it finds it, sets up a 64KB RAMdisk. The MPF-III/312 has 66KB which ProDOS takes to be 128KB and attempts to create the /RAM drive. Again, a simple patch to ProDOS fixes this.

An optional bus expander was released that plugged into Slot 2 on the right hand side of the unit plus a ribbon cable to a header at the rear of the to pick up the missing slotr select signals. This allowed up to 5 external cards (slots 2/3/4/5/7).

_______________________

Contributors: David Wilson

Sergio Luvoni adds:
This model was known as Latindata MPF-III in South America. Monitor had a green CRT. Because of a diferent memory map, it was not fully compatible with the Apple II. However, Apple's Z-80 expansion card worked and a double 5.25" floppy drives unit was also available.

Further information from Mark Slabbert:
I purchased the MPF3 in 1984. Was a pleasure to work with. Most Apple software packages would work on it but some graphics related software would not. Had extra commands in Rom not found on Apple, i.e. Effect x which would generate sound effects from the on board audio chip.
Never gave me trouble although the keyboard had the habit of losing letters when cleaned. Excellent documentation included with computer. Sold it in 1988 in working order. Very compact casing but was still able to modify circuitry to drive external devices off data bus.
Fond memories.


ShareThis


 

Also have fond memories of this piece. I had it as a teenager and used mostly with DOS 3.3. The CP/M card allowed to run Supercalc and Wordstar. The included documentation had a brief but insightful chapter on 6502 assembly programming.

          
Tuesday 29th January 2008
Erich Strelow (Chile)

 

NAME  MPF-III/312
MANUFACTURER  Multitech
TYPE  Home Computer
ORIGIN  Taïwan
YEAR  1983
KEYBOARD  90 key, full stroke, internal conductive rubber membrane, 12+ function keys, numeric keypad
CPU  MOS 6502
SPEED  1 MHz
RAM  64KB DRAM + 2KB SRAM
ROM  24 KB
TEXT MODES  40 x 24 / 80 x 24
GRAPHIC MODES  40 x 40-48 (16 col), 280 x 160-192 (6 col), 560 x 160-192 (2 col)
COLOrsc  16 maximum
SOUND  1 bit Apple II compatible + AY-3-8912 Programmable Sound Generator. Internal speaker + External speaker jack
I/O PORTS  TV RF out (RCA), Monitor Out (RCA), External Speaker Out (3.5mm), Cassette In/Out (2x3.5mm), Printer (16 pin, male 2x8 0.1"), Keyboard (DE-9M), Joystick (DE-9F), External Slot 2 (Apple II 50 pin), Internal Slots 4/6/7 (50 pin, female 2x25 0.1"), 2x Floppy Disk (optional, Apple Disk ][ compatible)
BUILT IN MEDIA  None
OS  DOS 3.3, CP/M (with optional Z-80 card), ProDOS 8 (if patched)
POWER SUPPLY  internal switch-mode
PRICE  $699 (1984, Australia)





Google
 
Web www.old-computersc.com


 

More pictures
Adverts
Hardware Info
Internet Links
Documentations
Mini-Forum

Click here to go to the top of the page   
Contact us | members | about old-computers.com | donate old-systems | FAQ
OLD-COMPUTERS.COM is hosted by - NYI (New York Internet) -