File:Ferranti Archives SPEC128-FER-NOT-029 Ferranti pencil notes on ULA 7K010 output pin loads.pdf
Summary
[edit | edit source]One sheet of pencil notes on squared paper, headed "7K010", tabulating the load on each memory-side output of the Spectrum 128 ULA. Each of A0 to A7 (pins 4 to 11) drives eight 4164 DRAMs (10 uA and 7 pF each) plus a 470 ohm resistor to a "PLA" and a TTL input; NRAS (pin 42) the same plus one LSTTL load; NCAS (pin 2) and NDRAMWE (pin 18) eight 4164s each; NROMCS (pin 41) a 680 ohm series resistor to an EPROM chip enable and one TTL output. These are the pins listed in the pencil "16mA test" note on the specification SPEC128-FER-DAT-028, and the 470 ohm and 680 ohm values match the Sinclair logic drawing SPEC128-SIN-SCH-023. The pin numbers agree with the pin table SPEC128-FER-NOT-032. Part of the Ferranti Archives 2026.
Archive record
[edit | edit source]| Catalogue ID | SPEC128-FER-NOT-029 |
|---|---|
| Date | Undated |
| Origin | Ferranti |
| Document type | Notes |
| Device or subject | ULA 7K010 (ZX Spectrum 128) |
| Catalogue description | Handwritten pencil notes on ULA 7K010 pinouts and electrical load calculations |
| Original file name | {{{filename|}}}
|
| Found in | SPEC128-FER-FOL-037 |
| Pages | 1 |
Source
[edit | edit source]Ferranti Archives 2026, original scan on Google Drive.
Author
[edit | edit source]Ferranti Electronics Limited
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 | 11:02, 18 October 2026 | 0 × 0 (678 KB) | Josh (talk | contribs) | Ferranti Archives 2026: SPEC128-FER-NOT-029 |
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