website/content/museum/terta-tap-34.md

---
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)

<table> <tr> <td></td> <td>We need more info about this computer ! If you designed, used, or have more info about this system, please send us pictures or anything you might find useful.</td> <td></td> </tr> </table>