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21:44, 17 June 2026 Josh talk contribs uploaded File:Acorn System 1 circuit diagram (3 of 3).png (Acorn System 1 circuit diagram, sheet 3 of 3. Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History.)
21:44, 17 June 2026 Josh talk contribs uploaded File:Acorn System 1 circuit diagram (2 of 3).png (Acorn System 1 circuit diagram, sheet 2 of 3. Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History.)
21:44, 17 June 2026 Josh talk contribs uploaded File:Acorn System 1 circuit diagram (1 of 3).png (Acorn System 1 circuit diagram, sheet 1 of 3 (System 1 Technical Manual circuit diagrams). Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History.)
21:44, 17 June 2026 Josh talk contribs uploaded File:Acorn System 5 card cage.jpg (Acorn System 5 card cage and 10-slot backplane. Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History.)
21:44, 17 June 2026 Josh talk contribs uploaded File:Acorn System 5.jpg (Acorn System 5 (front): the card cage with Eurocards on the left and two 5.25-inch floppy drives on the right. Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History.)
21:44, 17 June 2026 Josh talk contribs uploaded File:Acorn System 4 backplane.jpg (Acorn System 4 14-slot Eurocard backplane. Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History.)
21:44, 17 June 2026 Josh talk contribs uploaded File:Acorn System 4.jpg (Acorn System 4 double-height rack (14-slot lower frame) with some Eurocards fitted. Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History.)
21:44, 17 June 2026 Josh talk contribs uploaded File:Acorn System 3.jpg (Acorn System 3, a disc-based Eurocard system in a card frame. Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History.)
21:44, 17 June 2026 Josh talk contribs uploaded File:Acorn System 2.jpg (Acorn System 2 in a 19-inch card frame with an 8-slot backplane. (Control Universal catalogue image, via Chris's Acorns.))
21:44, 17 June 2026 Josh talk contribs uploaded File:Acorn System 1 CPU board.jpg (Acorn System 1 6502 CPU Eurocard (part 200,000): Rockwell R6502P, 8154 RAM/IO devices, 2114 RAM, 74S571 ROMs and the LM340-T5 5 V regulator. Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History.)
21:44, 17 June 2026 Josh talk contribs uploaded File:Acorn System 1.jpg (Acorn System 1 (Acorn Microcomputer, 1979): the 25-key hex keypad and 8-digit LED display on the keyboard Eurocard. Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History.)
21:30, 17 June 2026 Josh talk contribs uploaded File:Acorn Risc PC Technical Reference Manual.pdf (Acorn Risc PC Technical Reference Manual (Issue 1, September 1994; part 0497,057), Acorn Computers. Full hardware reference for the Acorn Risc PC 600 and Acorn Risc PC 700: system description (ARM610/710, IOMD, VIDC20, FDC37C665), interface specifications, the complete main-PCB parts list (capacitor designators and values), the Power On Self Test, engineering drawings and chipset pinouts. Source PDF: 4corn Computers archive. Category:Acorn Service Manuals)
21:30, 17 June 2026 Josh talk contribs uploaded File:Acorn Risc PC 700 motherboard.jpg (Acorn Risc PC 700 motherboard (board 1208,000) with 2 MB VRAM and RAM SIMMs fitted; IOMD and VIDC20 visible, with the two CPU-card sockets and RISC OS 3.6 ROMs. Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History.)
21:30, 17 June 2026 Josh talk contribs uploaded File:Acorn Risc PC 600 motherboard.jpg (Acorn Risc PC 600 motherboard (board 0197,000): the two CPU-card sockets and RISC OS ROMs (left), IOMD, VIDC20, VRAM and DRAM SIMM sockets, on-board IDE/floppy connectors and the backplane socket. Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History.)
21:30, 17 June 2026 Josh talk contribs uploaded File:Acorn Risc PC.jpg (Acorn Risc PC publicity photograph (Risc PC 600, 1994), showing the stackable "slice" case. Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History.)
21:18, 17 June 2026 Josh talk contribs uploaded File:Acorn A5000 Circuit Diagrams.pdf (Acorn A5000 main PCB circuit diagrams (sheets 1-4 plus the power-and-ground sheet) from the A5000 Technical Reference Manual. Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History. Category:Acorn Service Manuals)
21:18, 17 June 2026 Josh talk contribs uploaded File:Acorn A5000 Service Manual.pdf (Acorn A5000 Module Level Service Manual (Issue 1, November 1991), Acorn Computers. Module-level fault diagnosis, the ARM5000/A5000 functional test suite, disassembly, PSU-fail procedure and safety tests. Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History. Category:Acorn Service Manuals)
21:18, 17 June 2026 Josh talk contribs uploaded File:Acorn A5000 circuit diagram (4 of 4).png (Acorn A5000 main PCB circuit diagram, sheet 4 of 4. Greyscale scan, downscaled. Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History.)
21:18, 17 June 2026 Josh talk contribs uploaded File:Acorn A5000 circuit diagram (3 of 4).png (Acorn A5000 main PCB circuit diagram, sheet 3 of 4. Greyscale scan, downscaled. Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History.)
21:18, 17 June 2026 Josh talk contribs uploaded File:Acorn A5000 circuit diagram (2 of 4).png (Acorn A5000 main PCB circuit diagram, sheet 2 of 4. Greyscale scan, downscaled. Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History.)
21:18, 17 June 2026 Josh talk contribs uploaded File:Acorn A5000 circuit diagram (1 of 4).png (Acorn A5000 main PCB circuit diagram, sheet 1 of 4 (A5000 Technical Reference Manual). Greyscale scan, downscaled. Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History.)
21:18, 17 June 2026 Josh talk contribs uploaded File:Acorn A5000 motherboard.jpg (Acorn Archimedes A5000 motherboard (25 MHz, board 0192,100). The four RISC OS 3 ROMs (with an empty fifth socket), the ARM3, MEMC1a, VIDC1a and IOC, the IDE/floppy connectors (lower right), the podule-backplane connector and the battery pack. Source: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History.)
20:59, 17 June 2026 Josh talk contribs uploaded File:Acorn A3010 A3020 A4000 Training Reference Manual.pdf (Acorn A3010, A3020 and A4000 Training Reference Manual (1993), Acorn Computers. Dealer training reference: architecture, PSU design and servicing overview. Source PDF: Internet Archive. Category:Acorn Service Manuals)
20:59, 17 June 2026 Josh talk contribs uploaded File:Acorn A3010 A3020 A4000 Technical Reference Manual.pdf (Acorn A3010, A3020 and A4000 Technical Reference Manual, Acorn Computers. Hardware reference and main-PCB circuit diagrams (Roadrunner board). Source PDF: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History. Category:Acorn Service Manuals)
20:59, 17 June 2026 Josh talk contribs uploaded File:Acorn A3010 A3020 A4000 Service Manual.pdf (Acorn A3010, A3020 and A4000 Module Level Service Manual, Acorn Computers. Module-level fault diagnosis, disassembly, functional and safety test procedures. Source PDF: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History. Category:Acorn Service Manuals)
20:59, 17 June 2026 Josh talk contribs uploaded File:Acorn A3000 Technical Reference Manual.pdf (Acorn A3000 Technical Reference Manual, Acorn Computers. Hardware reference and main-PCB circuit diagrams. Source PDF: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History. Category:Acorn Service Manuals)
20:59, 17 June 2026 Josh talk contribs uploaded File:Acorn A3000 Service Manual.pdf (Acorn A3000 Service Manual, Acorn Computers. Component-level service manual: system description, fault diagnosis, main-PCB repair and full parts list. Source PDF: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History. Category:Acorn Service Manuals)
20:59, 17 June 2026 Josh talk contribs uploaded File:Acorn Archimedes A4000 circuit diagram (3 of 3).png (Acorn Archimedes A4000 ("Roadrunner") main PCB circuit diagram, sheet 3 of 3. Greyscale scan, downscaled. Source: The Centre for Computing History (Chris Whytehead collection).)
20:59, 17 June 2026 Josh talk contribs uploaded File:Acorn Archimedes A4000 circuit diagram (2 of 3).png (Acorn Archimedes A4000 ("Roadrunner") main PCB circuit diagram, sheet 2 of 3. Greyscale scan, downscaled. Source: The Centre for Computing History (Chris Whytehead collection).)
20:59, 17 June 2026 Josh talk contribs uploaded File:Acorn Archimedes A4000 circuit diagram (1 of 3).png (Acorn Archimedes A4000 ("Roadrunner") main PCB circuit diagram, sheet 1 of 3 (from the A3010/A3020/A4000 Technical Reference Manual). Greyscale scan, downscaled. Source: The Centre for Computing History (Chris Whytehead collection).)
20:59, 17 June 2026 Josh talk contribs uploaded File:Acorn Archimedes A3000 circuit diagram (2 of 2).png (Acorn Archimedes A3000 main PCB circuit diagram, sheet 2 of 2 (from the A3000 Technical Reference Manual). Greyscale scan, downscaled. Source: The Centre for Computing History (Chris Whytehead collection).)
20:59, 17 June 2026 Josh talk contribs uploaded File:Acorn Archimedes A3000 circuit diagram (1 of 2).png (Acorn Archimedes A3000 main PCB circuit diagram, sheet 1 of 2 (from the A3000 Technical Reference Manual). Greyscale scan, downscaled. Source: The Centre for Computing History (Chris Whytehead collection).)
20:59, 17 June 2026 Josh talk contribs uploaded File:Acorn Archimedes A4000 motherboard.jpg (Acorn Archimedes A4000 main PCB ("Roadrunner", part 0194,600) showing the integrated ARM250, two RISC OS ROMs, RAM with expansion cards, and the IDE/floppy connectors. Source: Chris's Acorns, The Centre for Computing History (Chris Whytehead collection).)
20:59, 17 June 2026 Josh talk contribs uploaded File:Acorn Archimedes A3000 motherboard.jpg (Acorn Archimedes A3000 main PCB (Issue 3), part no. 0180,000, with add-ons removed: ARM2, MEMC1a, VIDC1a, IOC, four RISC OS ROMs and the CMOS battery (bottom left). Source: Chris's Acorns, The Centre for Computing History (Chris Whytehead collection).)
18:15, 17 June 2026 Josh talk contribs uploaded File:Acorn Electron Service Manual.pdf (Acorn Electron Service Manual (Part no. 0405001, Issue 2, January 1987), Acorn Computers. Dealer service manual: circuit description, ULA pin functions, fault-finding, power-supply specs and full main-PCB parts list. Source PDF: Chris's Acorns (Chris Whytehead collection) / The Centre for Computing History. Category:Acorn Service Manuals)
18:15, 17 June 2026 Josh talk contribs uploaded File:Acorn Atom Technical Manual.pdf (Acorn Atom Technical Manual (Issue 2, October 1980), Acorn Computers. Construction and reference manual: parts list, component layout, circuit description, power supply and memory map. Source PDF: Chris's Acorns (Chris Whytehead collection) / The Centre for Computing History. Category:Acorn Service Manuals)
18:02, 17 June 2026 Josh talk contribs uploaded File:Acorn Electron circuit diagram.png (Acorn Electron main PCB circuit diagram, Acorn drawing no. 105,000-C. Greyscale scan, downscaled. Source: 4corn Computers, scanned with assistance of The Centre for Computing History.)
18:02, 17 June 2026 Josh talk contribs uploaded File:Acorn Atom circuit diagram.png (Acorn Atom microcomputer circuit diagram, Acorn drawing no. 102,000-C. Greyscale scan, downscaled. Source: 4corn Computers, scanned with assistance of The Centre for Computing History.)
18:02, 17 June 2026 Josh talk contribs uploaded File:Acorn Electron motherboard.jpg (Acorn Electron opened, showing the Issue 4 main PCB in the case base and the Ferranti ULA (the pale rectangle, centre). Source: Chris's Acorns (Chris Whytehead collection), hosted by The Centre for Computing History.)
18:02, 17 June 2026 Josh talk contribs uploaded File:Acorn Atom motherboard layout.jpg (Acorn Atom motherboard component-location diagram showing the positions of the ICs. Source: The Acorn Atom Review, via Chris's Acorns / The Centre for Computing History.)
18:02, 17 June 2026 Josh talk contribs uploaded File:Acorn Atom motherboard.jpg (Acorn Atom main PCB in base (unexpanded) configuration, board part no. 202,000 Issue 4, showing the empty expansion sockets. Source: Chris's Acorns (Chris Whytehead collection), hosted by The Centre for Computing History.)
17:49, 17 June 2026 Josh talk contribs uploaded File:BBC Micro BPlus PSU Schematic.png (Upload BBC Micro B+ image (Acorn Service Manual Section 2, October 1985 / Wikimedia Commons))
17:49, 17 June 2026 Josh talk contribs uploaded File:BBC Micro BPlus PCB Traces.png (Upload BBC Micro B+ image (Acorn Service Manual Section 2, October 1985 / Wikimedia Commons))
17:49, 17 June 2026 Josh talk contribs uploaded File:BBC Micro BPlus PCB Silkscreen.png (Upload BBC Micro B+ image (Acorn Service Manual Section 2, October 1985 / Wikimedia Commons))
17:49, 17 June 2026 Josh talk contribs uploaded File:BBC Micro BPlus PCB Layout.png (Upload BBC Micro B+ image (Acorn Service Manual Section 2, October 1985 / Wikimedia Commons))
17:49, 17 June 2026 Josh talk contribs uploaded File:BBC Micro BPlus Main Schematic.png (Upload BBC Micro B+ image (Acorn Service Manual Section 2, October 1985 / Wikimedia Commons))
17:49, 17 June 2026 Josh talk contribs uploaded File:BBC Micro BPlus Keyboard Schematic.png (Upload BBC Micro B+ image (Acorn Service Manual Section 2, October 1985 / Wikimedia Commons))
17:49, 17 June 2026 Josh talk contribs uploaded File:BBC Micro BPlus Block Diagram.png (Upload BBC Micro B+ image (Acorn Service Manual Section 2, October 1985 / Wikimedia Commons))
17:49, 17 June 2026 Josh talk contribs uploaded File:BBC Micro BPlus Assembly Exploded.png (Upload BBC Micro B+ image (Acorn Service Manual Section 2, October 1985 / Wikimedia Commons))
17:49, 17 June 2026 Josh talk contribs uploaded File:Acorn Econet X25 Gateway BBC B Plus card.jpg (Upload BBC Micro B+ image (Acorn Service Manual Section 2, October 1985 / Wikimedia Commons))