yann64andClaude Opus 5.5
c913d792c4
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ
163 lines
8.0 KiB
Markdown
163 lines
8.0 KiB
Markdown
---
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title: CENTRAL DATA 2650
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categories:
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- Computers
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types:
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- Home Computer
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origins:
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- U.S.A.
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years:
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- '1977'
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cpus:
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- Signetics 2650
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params:
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name: '2650'
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image: /media/museum/photos/centraldata_2650_2s.jpg
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company: /companies/central-data
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company_name: CENTRAL DATA
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specs:
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- label: NAME
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value: '2650'
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- label: MANUFACTURER
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value: Central Data
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- label: TYPE
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value: Home Computer
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- label: ORIGIN
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value: U.S.A.
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- label: YEAR
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value: '1977'
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- label: CPU
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value: Signetics 2650
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- label: SPEED
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value: 1.18MHz (Xtal of 14Mhz divided by 12), later increased to 4.73Mhz with improved 2650 chips
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- label: RAM
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value: 2 KB (up to 32 KB)
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- label: ROM
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value: 8 KB
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- label: TEXT MODES
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value: 80 chars. x 16 lines
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- label: GRAPHIC MODES
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value: None
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- label: COLORS
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value: Monochrome
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- label: I/O PORTS
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value: S-100 BUS, one parallel input port
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- label: PRICE
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value: |-
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2650 board : $275\
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16 KB RAM board $289\
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24 KB RAM board $395\
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32 KB RAM board $475\
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Editor/Assembler $20 - Basic language $20
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tabs:
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- photos
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- adverts
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- emulators
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- links
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- docs
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photos:
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- title: THE CENTRAL DATA 2650 COMPUTER SYSTEM
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subtitle: ''
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text: ''
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image: /media/museum/photos/centraldata_2650_2.jpg
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- title: ANOTHER PICTURE
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subtitle: ''
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text: ''
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image: /media/museum/photos/centraldata_2650_1.jpg
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adverts:
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- title: 'COMMERCIAL PAMPHLET - PAGE #1'
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subtitle: ''
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text: |-
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... from Australia
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thanks to Richard Rogers
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image: /media/museum/pubs/centraldata_2650_flyers_1.jpg
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- title: 'COMMERCIAL PAMPHLET - PAGE #2'
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subtitle: ''
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text: thanks to Richard Rogers
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image: /media/museum/pubs/centraldata_2650_flyers_2.jpg
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- title: 'COMMERCIAL PAMPHLET - PAGE #3'
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subtitle: ''
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text: thanks to Richard Rogers
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image: /media/museum/pubs/centraldata_2650_flyers_3.jpg
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- title: 'COMMERCIAL PAMPHLET - PAGE #4'
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subtitle: ''
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text: thanks to Richard Rogers
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image: /media/museum/pubs/centraldata_2650_flyers_4.jpg
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emulators:
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- title: WinArcadia / AmiArcadia
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url: http://amigan.yatho.com/
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platform: Multiplatform
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text: AmiArcadia and WinArcadia are multi-emulators of Signetics-based machines
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links:
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- title: Emerson Arcadia 2001 Central
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url: http://amigan.yatho.com
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text: Emulator and software to download
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docs:
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- title: CENTRAL DATA 2650 NEWSLETTER - JULY 1978
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url: null
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cover: /media/museum/docs/couvs/central-data_2650_newsletter_july-1978.jpg
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text: |-
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**CENTRAL DATA 2650 NEWSLETTER - JULY 1978**\
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written by Central Data
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compiled/archived by Richard Rogers\
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type of document : PDF\
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size : 432 KB
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**... READ THE ONLINE VERSION BY CLICKING BELOW :**
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comments:
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- author: Richard Rogers (Australila)
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date: Wednesday 3rd December 2008
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text: |-
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In 1977, I was interested in amateur radio and Morse code and wished to build a keyboard to transmit Morse. Designs I had seen seemed to use a lot of ICs and I thought that it would be better to use one of these new-fangled microprocessors which I could program to send Morse and also use for other things.
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Most microprocessor board designs seemed to require a separate terminal with even more ICs. However I remembered seeing a design in Radio-Electronics which combined the terminal and processor on the one board and should be cheaper to build.
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So I copied the three articles from the April - June issues and read them thoroughly. I did not have enough money to buy all the parts at once, but I ordered the bare circuit board in December 1977 and it took me a year and about $500 to obtain all the parts. Thirty years later I suppose that would be equivalent to about $5000, which seems a lot of money for a computer with 768 bytes of memory! At the time, I recall saying to a friend that I had spent the year building a money sink.
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Learning to program took a while and hand assembling with its need for counting relative offsets in hexadecimal led to me counting other things as . . . 8, 9, A, B, bugger . . .
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I took me until May 1979 before I first used the 2650 system to send Morse code, but alas, I found that using two hands and the large keyboard on the operating desk were inconveniences which led me to go back to my old keyer.
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But I found many other entertainments associated with the computer, building homebrew dynamic memory, NRZ recorder and floppy disk controller.
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I later used a Tandy Color Computer before succumbing to the PC. However I later started using PIC16C84s as I remembered having so much fun with assembler with the 2650.
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73 VK7RO
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- author: Greg Kilfoyle (San Jose/California $ Melbourne/Australia)
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date: Tuesday 27th October 2020
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text: |-
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I purchased the bare board and components as a kit from Rod Irving Electronics in Melbourne Australia, back in 1976/7 (from memory).
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I think the kit was $150. (I worked at Repco Exchange Engines factory for 2 weeks over the summer break to earn the money.) It also came fully assembled for much more money. The young chap (also a teenager) helping me said it wasn''t too hard to put together, hinting to buy the kit not the fully assembled. His boss pulled him aside and chastised him for that comment, wanting to get the higher price :)
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Anyway, it had a composite video out, cassette interface and header for ASCII keyboard. I had to purchase the bare keyboard, plus an ASCII keyboard circuit board.
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We had an old B/W valve/tube TV that regularly needed the TV repair man to come around and fix - usually just replacing the valves. I told him about my computer kit purchase and he $ped a couple of wires out the back for direct video input.
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I built the keyboard board and wired up the keyboard. Built the Central Data board with lots of 74xx TTL chips, RAM, caps and resistors.
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First time powering it up (don''t recall what I used for power, could have been a train-set power supply) nothing happened, no output to the display. Using the TV direct video input as a poor-man''s oscilloscope I found that one of the 7400 NAND gates was bad - it should have had a clock signal. There was a free gate on another part of the board so I cut some pins and added some jumper wires. Lo-and-behold, it booted up!
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Writing in hex assembler was, let''s say, fun. I didn''t care, this was so exciting for a teenager. Only about 700 bytes were available for programs with the rest of the 2K memory being the memory mapped display. In that 700 bytes I wrote a Space Invaders game. It was functional enough that I spent a lot of time playing it. Programs were saved to cassette.
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Threw all the bits in the dumpster when we moved to California in 1992. Wish I hadn''t now :(
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- author: Peter Wotherspoon (Peterborough, Ontario Canada)
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date: Thursday 4th January 2018
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text: I just bought the board, and injected the RF into the innerds of a TV, Got a keyboard, and got going with the machine code. I remember I stole display memory for program execution and took advantage of half bytes that were identical. I think it could automatically adapt to speed of the morse code, but I can''t remember if it was for receiving for transmitting... I''d like to get one again. Pitched it.
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- author: James Jacobs (Canberra/Australia)
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date: Monday 2nd February 2009
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text: The Ami/WinArcadia emulator is the only emulator of this machine. You can get it from http://amigan.classicgaming.gamespy.com
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oc_id: 45
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source:
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url: https://web.archive.org/web/20230608214349/http://www.old-computers.com/museum/computer.asp?c=45
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date: '2023-06-08'
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---
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The 2650 was first reviewed in the US magazine Radio-Electronics, in the April 1977 issue.
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This computer was supplied in assembled form with an Editor / Assembler. A 12K BASIC was also available on cassette tape or floppy if you had the HD interface.
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<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>
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