File:Ferranti Archives MD-SIN-SCH-003 ZX Microdrive hand-drawn circuit diagram, 10 June 1983.pdf
Summary
[edit | edit source]A hand-lettered circuit diagram of the complete ZX Microdrive, reproduced as a photocopy and signed off "MICRODRIVE 10 JUN 83, (c) Copyright Sinclair Research Ltd". It divides the circuit into the head board S12100, carrying IC1 (the Ferranti 2G007 ULA, see MD-FER-SCH-001) and the 5V regulator IC2, and the base PCB S12101, which carries the motor and indicator stage (Q1, Q2) and the edge-connector bus. The three-winding tape head L1 connects to the 2G007 inputs INA1, INA2, INB1 and INB2, with the third winding (via D1 and D2) on the ERASE line. The bus lines are COMMS IN 4B, ERASE 5B, COMMS CLK 2B, R/W 5A, DATA 1 1A, DATA 2 1B, 9V 4A, WR PROT 2A and 0V on 6A to 8B, with the note "A is component side". The motor, a micro switch and the LED D5 are drawn off-board. The formal redraw of 16 September 1983 is MD-SIN-SCH-004. Part of the Ferranti Archives 2026.
Archive record
[edit | edit source]| Catalogue ID | MD-SIN-SCH-003 |
|---|---|
| Date | 10 June 1983 |
| Origin | Sinclair |
| Document type | Schematic/Logic Diagram |
| Device or subject | Microdrive |
| Catalogue description | Hand drawn ZX Microdrive Schematic |
| Original file name | {{{filename|}}}
|
| Found in | MD-FER-FOL-008 |
| Pages | 1 |
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].
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| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 15:54, 16 October 2026 | 0 × 0 (1.31 MB) | Josh (talk | contribs) | Ferranti Archives 2026: MD-SIN-SCH-003 |
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