63 votes

What is this large device labelled 'Telefunken Datenspeicher' and how does it work?

It's a Demonstrator for an ALU and Memory. It's a serial ALU with registers, data path and a 6 byte storage, falling short to be a CPU. An ALU (German as well ALU, sometimes 'Rechenwerk') is a ...
Raffzahn's user avatar
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41 votes
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High-capacity floppy drives from the early 2000s, what were they?

There were many. After 1.44 MB HD floppies, the same form factor was extended to 2.88 MB ED in 1988. Knighted by IBM using it with the 1991 PS/2 Model 57. ED became quite popular in Japan. There were ...
Justme's user avatar
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29 votes

Denys Fisher, of Spirograph fame, using a computer late 1976, early 1977

My name is Duncan Fisher and I'm the youngest son of Denys Fisher. I remember dad's HP programmable calculator and plotter set up very well - can't shed any light on the specific model though. What I ...
Duncan's user avatar
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24 votes
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Denys Fisher, of Spirograph fame, using a computer late 1976, early 1977

TL;DR: It's a HP 9825B desktop calculator and a HP 9872 flatbed plotter. By the looks it can be either a HP 9825 desktop calculator (*1) introduced in 1976, or a 1978 HP9831 computer (*2). (HP 9825A ...
Raffzahn's user avatar
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20 votes
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In this movie I see a strange cable for terminal connection, what kind of connection is this?

It's probably much like the Ampex 210. See page 2-7 of the Ampex 210 Operating Manual. Based on the position, it would be the primary RS232S port connected to a ribbon cable. Ribbon cables were used ...
HABO's user avatar
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19 votes

In this movie I see a strange cable for terminal connection, what kind of connection is this?

25-wire ribbon cables were quite common for serial ports. See, for example, the classic breakout box: I preferred using cables and adapters. Typically I would use 6-wire cables (ground, TX, RX, CTS, ...
manassehkatz-Moving 2 Codidact's user avatar
17 votes

What is this large device labelled 'Telefunken Datenspeicher' and how does it work?

A and B are two shiftable 8-bit registers. They form a serial ALU. U is the Ɯberlauf-Register (carry). "Takt" is the clock signal. It shifts both registers, after 8 clocks the operation is ...
dirkt's user avatar
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12 votes

High-capacity floppy drives from the early 2000s, what were they?

I remember using Iomega Zip drives for the worst. Those came in 100 MB which was huge. I had Syquest cartridges, but the reader was not external so you could not carry it somewhere else. On my amiga, ...
Jean-François Fabre's user avatar
12 votes
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Origin of what seems to be a Front-Panel

Four-Phase Systems I worked with others who programmed Four-Phase computers. I really can't add more. I simply remembered the logo. This image appears to show a similar, if not identical front panel. ...
Rick Smith's user avatar
11 votes

Denys Fisher, of Spirograph fame, using a computer late 1976, early 1977

The pen plotter appears to be an HP 7221 or 9872. They look identical but differ in their interfacing: the 7221 is the RS-232 version and does not speak HP-GL; the 9872 uses HP-IB and HP-GL. If the ...
John Dallman's user avatar
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9 votes

High-capacity floppy drives from the early 2000s, what were they?

Insite also made the 20MB "floptical" drive - the disks had the same form factor as 3.5" floppies, but were made of a slightly different material. A laser was used to heat a spot on the ...
d3jones's user avatar
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3 votes

High-capacity floppy drives from the early 2000s, what were they?

There were magneto-optical discs. They were similar to the CDs, but the information was read and recorded by a combination of magnetical and optical means. Read happened by that magnetic field splits ...
peterh's user avatar
  • 1,779
3 votes

High-capacity floppy drives from the early 2000s, what were they?

IMO the things that best fit your description would be. The iomega zip drive was released in 1994 with a capacity of 100MB, the disks were slightly bigger than a 3.5 inch floppy, but the internal ...
Peter Green's user avatar
  • 2,912
3 votes

What dot matrix printer? - UK, 1987

This a CP80 which I imported from Japan when I owned Micro Peripherals (Micro P). We distributed it throughout Europe. The quality was not very good so we stopped selling after only a few months.
Ian Donaldson's user avatar
2 votes

What 1970's terminal was black on white and had an orange keyboard?

In the 1970s I worked for TDS (Terminal Display Systems) the UK importers Of ADDS (Applied Digital Data Systems). I tested and repaired these consoles (520 and 980) to component level. There was also ...
brent dobson's user avatar

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