--- title: TERTA TAP-34 categories: - Computers types: - Professional Computer origins: - Hungary years: - '1980' cpus: - K580 params: name: TAP-34 image: /media/museum/photos/terta_tap34_1s.jpg company: /companies/terta company_name: TERTA specs: - label: NAME value: TAP-34 - label: MANUFACTURER value: Terta - label: TYPE value: Professional Computer - label: ORIGIN value: Hungary - label: YEAR value: '1980' - label: END OF PRODUCTION value: Unknown - label: BUILT IN LANGUAGE value: Bootloader for CP/M - label: KEYBOARD value: Hall-sensor - label: CPU value: K580 (Russian 8080 clone) - label: SPEED value: 2 MHz - label: RAM value: 60 KB - label: VRAM value: Unknown - label: ROM value: 2 kByte bootloader - label: TEXT MODES value: 80 x 25 - label: GRAPHIC MODES value: none - label: COLORS value: green / black (monochrome) - label: SOUND value: Tick sound when a key pressed - label: SIZE / WEIGHT value: Unknown - label: I/O PORTS value: keyboard, floppy drives, reader, modem, printer - label: OS value: CP/M on floppy disk - label: POWER SUPPLY value: Unknown - label: PERIPHERALS value: Floppy drive (2 X 8 - label: PRICE value: 300000 HUF tabs: - photos - links forum_thread: 1263 photos: - title: TAP-34 COMPLETE subtitle: '' text: Thanks to [www.machines.hu](http://www.machines.hu/hirek_cikkek/cikkek/tap34/tap34.html) for this picture image: /media/museum/photos/tap34_n.jpg - title: KEYBOARD subtitle: '' text: Thanks to [www.machines.hu](http://www.machines.hu/hirek_cikkek/cikkek/tap34/tap34.html) for this picture image: /media/museum/photos/terta_tap34_keyboard.jpg - title: DISPLAY FUNCTION KEYS subtitle: '' text: Thanks to [www.machines.hu](http://www.machines.hu/hirek_cikkek/cikkek/tap34/tap34.html) for this picture image: /media/museum/photos/terta_tap34_screen_functionkeys.jpg - title: INSIDE subtitle: '' text: Thanks to [www.machines.hu](http://www.machines.hu/hirek_cikkek/cikkek/tap34/tap34.html) for this picture image: /media/museum/photos/terta_tap34_inside.jpg - title: INSIDE CARDS subtitle: '' text: '' image: /media/museum/photos/terta_tap34_cards.jpg - title: CPU CARD subtitle: '' text: Thanks to [www.machines.hu](http://www.machines.hu/hirek_cikkek/cikkek/tap34/tap34.html) for this picture image: /media/museum/photos/terta_tap34_cpu_card.jpg - title: CRT CONTROLLER CARD subtitle: '' text: Thanks to [www.machines.hu](http://www.machines.hu/hirek_cikkek/cikkek/tap34/tap34.html) for this picture image: /media/museum/photos/terta_tap34_crt_controller_card.jpg - title: FLOPPY CONTROLLER CARD subtitle: '' text: Thanks to [www.machines.hu](http://www.machines.hu/hirek_cikkek/cikkek/tap34/tap34.html) for this picture image: /media/museum/photos/terta_tap34_floppycontroller_card.jpg - title: RAM CARD subtitle: '' text: Thanks to [www.machines.hu](http://www.machines.hu/hirek_cikkek/cikkek/tap34/tap34.html) for this picture image: /media/museum/photos/terta_tap34_ram_card.jpg - title: CONNECTORS subtitle: '' text: Thanks to [www.machines.hu](http://www.machines.hu/hirek_cikkek/cikkek/tap34/tap34.html) for this picture image: /media/museum/photos/terta_tap34_connectors.jpg - title: FLOPPY DRIVES subtitle: '' text: Thanks to [www.machines.hu](http://www.machines.hu/hirek_cikkek/cikkek/tap34/tap34.html) for this picture image: /media/museum/photos/terta_tap34_floppydrives.jpg - title: INSIDE FLOPPY DRIVES subtitle: '' text: Thanks to [www.machines.hu](http://www.machines.hu/hirek_cikkek/cikkek/tap34/tap34.html) for this picture image: /media/museum/photos/terta_tap34_floppydrives2.jpg links: - title: www.machines.hu url: http://www.machines.hu/hirek_cikkek/cikkek/tap34/tap34.html text: dedicated page with great info oc_id: 1298 source: url: https://web.archive.org/web/20230610144416/http://www.old-computers.com/museum/computer.asp?c=1298 date: '2023-06-10' --- TAP 34 is a self design of Terta company from Hungary. Primarily it was designed as a terminal for big computer systems but it was also able to process data alone. The main integrated circuits were assembled in the USSR and in Hungary by Tungsram, but several parts were imported from other countries. The built-in monitor was a DME-28 monochrome CRT made by Orion. This company was famous for its televisions in Hungary and the other KGST countries. The floppy drive attached to the computer was regular 8 inch 77 track drive using IBM format. This drive, which could use single and double sided disks, was a hungarian product also, made by the MOM. The first design had some communications software in the EPROM, but at the end of the 80's the computer was redesigned. This second design had only 2 kBytes of EPROM, containing the bootloader software for the CP/M. The CPU card, the Ram card, the CRT card and the floppy controller card were all placed into a coloured plastic case. The system was designed around the classic 8080 circuits.\ \- Display controller: i8275\ \- Floppy controller: i8271\ \- DMA: i8257\ \- i8255 PIO, i8253 CTC, i8251 USART TAP-34 had the number EC-8534 in the EC-serries (united serries of computers) of East block and ex-USSR. Abbrevation "TAP" states for Teletype Abonents Point. There were three known modifications of EC-8534: original one, EC-8534.02, and EC-8534.3. The last one had optional capability to boot CP/M clone called VDOS. The standard software included some built-in teletype programs and BASIC (Terta-BASIC). There was also a so called DP (Developer Package) floppy bootable system for assembly development (included editor, assembler and debugger). Some constructive features of TAP-34 and the mentioned software suggest that there was some prototype CPU as well as original development software which were borrowed to design the TAP-34. \_\_\_\_\_\_\_\_ **Contributors:** Kun-Szabo Marton, Cyril Murzin\ **Source =** [www.machines.hu](http://www.machines.hu/hirek_cikkek/cikkek/tap34/tap34.html)
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