File:Ferranti Archives ZX81-SIN-LIT-131 Sinclair ZX81 assembly instructions with circuit diagram SRC 049, 1981.pdf
Summary
[edit | edit source]Colour scans of Sinclair Research's ZX81 kit assembly instructions, "(c) Sinclair Research Limited 1981", a folded sheet printed on both sides: the cover, sections 1 to 10 (preparation, precautions, component identification, circuit board assembly, testing, fault finding, case assembly, component list, power supply, service), the circuit diagram "DRW No. SRC 049", and Fig 6, the component layout of the "Issue One" board. The component list gives IC1 as the "Sinclair Logic IC", 40 pins, "158 printed underside", presumably the Ferranti ULA 2C158 of ZX81-FER-SCH-105. IC4 is an MK4118 1K x 8 RAM with link L1 fitted, or two 2114s, and the circuit diagram notes that a 4816 2K x 8 RAM in a 28-pin package can be used with link L2. Section 9 asks for a smoothed DC supply of 12 V maximum and about 8 V minimum on load, at 600 mA (1.2 A if a printer runs from the same supply), while the circuit diagram labels the input "+7V to 11V DC". This is the same edition as the copy on the Sinclair ZX81 Assembly Instructions page: the text, the drawing and Fig 6 match. This scan is in colour at higher resolution, has no dealer stamps, shows the circuit diagram on one sheet, and does not include the third-party add-on documents bound into the wiki copy. The ZX80 equivalent is ZX80-SIN-LIT-130. Part of the Ferranti Archives 2026.
Archive record
[edit | edit source]| Catalogue ID | ZX81-SIN-LIT-131 |
|---|---|
| Date | 1981 |
| Origin | Sinclair |
| Document type | Literature |
| Device or subject | ZX81 |
| Catalogue description | Scan of ZX81 assembly instruction as provided with the ZX81 kit |
| Original file name | {{{filename|}}}
|
| Found in | ZX81-FER-FOL-142 |
| Pages | 4 |
Source
[edit | edit source]Ferranti Archives 2026, original scan on Google Drive.
Author
[edit | edit source]Sinclair Research Ltd
Licence
[edit | edit source]Ferranti Archives 2026: source and terms of use
This scan is part of the Ferranti Archives 2026, a collection of Sinclair-related documents from Ferranti's files, catalogued in 2026 and released through the Happy Little Diodes YouTube channel (video, catalogue). The archive presents the documents for preserving and archiving material of historical interest, and for non-commercial, educational and archival research. Its terms state that consent is strictly limited to non-commercial use, and that any commercial exploitation of the documents or their contents, including use in connection with the manufacture, marketing or sale of goods, is strictly prohibited by Sky UK Limited.
Copyright remains with the rights holders. The file is not freely licensed and is hosted here for preservation and repair reference only, under the archive's terms. Personal information was redacted by the archive before release; if you find any that remains, please tell [email protected].
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 11:00, 18 October 2026 | 0 × 0 (2.78 MB) | Josh (talk | contribs) | Ferranti Archives 2026: ZX81-SIN-LIT-131 |
You cannot overwrite this file.
File usage
There are no pages that use this file.