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Last modified 2013-06-13

Sinclair ZX81

Type:8-bit home computer
CPU:Zilog Z80 @ 3.5 MHz
Operating system:Sinclair Basic
Memory:ROM: 8 KB
RAM: 1 KB (Expandable to 64 KB)
Graphics:Text: 32*22 characters
Graphics: 64*44 pixels, black and white
Storage:Cassette/tape recorder, 250 bd
Input:Integrated membrane keyboard
I/O ports:Cassette/tape recorder connectors. TV/RF out, Z80 bus edge connector
Voltage:7.5-10 VDC (9 VDC nominal) from external PSU. Internal 5 V regulator
Power consumption:Max 600 mA
Dimensions (W*H*D):167*40*175 mm
Weight:350 gr
Manufactured:UK, 1981-1982 (Discontinued)
Other:Also sold in the US as Timex Sinclair 1000
New price 1982 in Sweden: 895:- SEK (Kit), 995:- SEK (Factory built)
Related documents:
Notable "ham" software: "Callsearch" - By G6ENX (Requires 16K RAM expansion)
"Logbook" - By G6ENX (Requires 16K RAM expansion)
"OSCAR-RS Orbits" - By G8YT (Requires 16K RAM expansion)
"QTH locator/Contest score" - By G4ANB and G3UBX
"Distance & bearing" - By G4ANB and G3UBX
"Sprog finder" - By G4ANB and G3UBX