User contributions for Josh

17 June 2026

• 21:4521:45, 17 June 2026 diff hist +261 N File:Acorn System 5 Handbook.pdf Acorn System 5 Handbook (1 March 1983), Acorn Computers. Covers the System 5 machine and its Eurocards (6502/6502A CPU, VDU, 32K DRAM, floppy controller, Econet). Source PDF: Chris's Acorns / The Centre for Computing History. Category:Acorn Service Manuals current
• 21:4421:44, 17 June 2026 diff hist +303 N File:Acorn System Catalogue.pdf Acorn System Computers and Eurocards catalogue (c. 1983), Acorn Computers. Describes the System 1-5 machines and the Acorn Eurocard range (CPU, VDU, memory, floppy controller, Econet and interface cards). Source PDF: Chris's Acorns / The Centre for Computing History. Category:Acorn Service Manuals current
• 21:4421:44, 17 June 2026 diff hist +193 N File:Acorn System 1 User Manual.pdf Acorn System 1 (Acorn Microcomputer) User Manual, Acorn Computers. Source PDF: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History. Category:Acorn Service Manuals current
• 21:4421:44, 17 June 2026 diff hist +197 N File:Acorn System 1 Circuit Diagrams.pdf Acorn System 1 circuit diagrams (CPU and keyboard/cassette Eurocards). Source PDF: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History. Category:Acorn Service Manuals current
• 21:4421:44, 17 June 2026 diff hist +331 N File:Acorn System 1 Technical Manual.pdf Acorn System 1 (Acorn Microcomputer) Technical Manual, Acorn Computers. Construction, circuit description and the full parts lists (CPU and keyboard Eurocards, including capacitor designators and values). Source PDF: Chris's Acorns (Chris Whytehead collection), The Centre for Computing History. Category:Acorn Service Manuals current
• 21:4421:44, 17 June 2026 diff hist +132 N 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. current
• 21:4421:44, 17 June 2026 diff hist +132 N 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. current
• 21:4421:44, 17 June 2026 diff hist +177 N 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. current
• 21:4421:44, 17 June 2026 diff hist +134 N 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. current
• 21:4421:44, 17 June 2026 diff hist +197 N 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. current
• 21:4421:44, 17 June 2026 diff hist +129 N 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. current
• 21:4421:44, 17 June 2026 diff hist +170 N 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. current
• 21:4421:44, 17 June 2026 diff hist +148 N 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. current
• 21:4421:44, 17 June 2026 diff hist +121 N 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.) current
• 21:4421:44, 17 June 2026 diff hist +227 N 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. current
• 21:4421:44, 17 June 2026 diff hist +202 N 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. current
• 21:3721:37, 17 June 2026 diff hist 0 Acorn Risc PC 700 →Relationship to the Risc PC 600 current
• 21:3721:37, 17 June 2026 diff hist 0 Acorn Risc PC 600 →Architecture current
• 21:3721:37, 17 June 2026 diff hist +5,145 N Acorn Risc PC 700 Capacitor Guide Create: Risc PC 700 recap (verified cap list, 1208,000-board note) current
• 21:3721:37, 17 June 2026 diff hist +6,188 N Acorn Risc PC 700 Troubleshooting Guide Create: Risc PC 700 troubleshooting (POST codes; cited) current
• 21:3721:37, 17 June 2026 diff hist +5,741 N Acorn Risc PC 700 Maintenance Guide Create: Risc PC 700 maintenance (cited) current
• 21:3721:37, 17 June 2026 diff hist +6,072 N Acorn Risc PC 600 Capacitor Guide Create: Risc PC 600 recap with full verified cap list (TRM parts list) current
• 21:3721:37, 17 June 2026 diff hist +8,629 N Acorn Risc PC 600 Troubleshooting Guide Create: Risc PC 600 troubleshooting (POST codes, rails, fuses, SMD-leak faults; cited) current
• 21:3721:37, 17 June 2026 diff hist +7,100 N Acorn Risc PC 600 Maintenance Guide Create: Risc PC 600 maintenance (mains PSU, NiMH battery, SMD-cap leakage; cited) current
• 21:3721:37, 17 June 2026 diff hist +4,121 N Acorn Risc PC 700 Create Risc PC 700 product page (infobox image, cited)
• 21:3721:37, 17 June 2026 diff hist +5,429 N Acorn Risc PC 600 Create Risc PC 600 product page (infobox image, cited)
• 21:3021:30, 17 June 2026 diff hist +986 N Acorn Risc PC Technical Reference Manual Create Risc PC TRM page (host PDF on-wiki, PDFEmbed) current
• 21:3021:30, 17 June 2026 diff hist +472 N 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 current
• 21:3021:30, 17 June 2026 diff hist +247 N 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. current
• 21:3021:30, 17 June 2026 diff hist +283 N 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. current
• 21:3021:30, 17 June 2026 diff hist +178 N 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. current
• 21:2121:21, 17 June 2026 diff hist −17 Acorn Archimedes A5000 Fix sibling-guide links to new titles; replace unverified capacitor values with sourced summary current
• 21:2121:21, 17 June 2026 diff hist +18 Category:Acorn Computers Prefix A5000 guide links with 'Acorn'; link the newly created guides
• 21:2121:21, 17 June 2026 diff hist +7,111 N Acorn A5000 Capacitor Guide Create: A5000 recap (SMD electrolyte leakage, procedure; values via on-wiki circuit diagrams) current
• 21:2121:21, 17 June 2026 diff hist +8,571 N Acorn A5000 Troubleshooting Guide Create: detailed A5000 troubleshooting (PSU rails/fuse, functional test suite, SMD-leak faults, ADFSBuffers; cited) current
• 21:2121:21, 17 June 2026 diff hist +9,462 N Acorn A5000 Maintenance Guide Create: A5000 maintenance (mains PSU, battery pack, SMD-cap leakage; cited) current
• 21:1821:18, 17 June 2026 diff hist +559 N Acorn A5000 Circuit Diagrams Create A5000 manual/circuit-diagram page (host PDF on-wiki, PDFEmbed) current
• 21:1821:18, 17 June 2026 diff hist +895 N Acorn A5000 Service Manual Create A5000 manual/circuit-diagram page (host PDF on-wiki, PDFEmbed) current
• 21:1821:18, 17 June 2026 diff hist +248 N 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 current
• 21:1821:18, 17 June 2026 diff hist +326 N 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 current
• 21:1821:18, 17 June 2026 diff hist +166 N 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. current
• 21:1821:18, 17 June 2026 diff hist +166 N 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. current
• 21:1821:18, 17 June 2026 diff hist +166 N 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. current
• 21:1821:18, 17 June 2026 diff hist +201 N 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. current
• 21:1821:18, 17 June 2026 diff hist +329 N 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. current
• 21:0821:08, 17 June 2026 diff hist +74 Acorn Archimedes A4000 Fix sibling-guide links to new titles; replace unverified capacitor values with sourced summary current
• 21:0721:07, 17 June 2026 diff hist +203 Acorn Archimedes A3000 Add maintenance/troubleshooting/capacitor + service-manual links; add Acorn navbox current
• 21:0721:07, 17 June 2026 diff hist +36 Category:Acorn Computers Prefix A3000/A4000 guide links with 'Acorn'; link to the newly created guides
• 21:0721:07, 17 June 2026 diff hist +5,889 N Acorn Archimedes A4000 Capacitor Guide Create: capacitor guide (leaded vs SMD distinction, PSU recap; values via on-wiki TRM) current
• 21:0721:07, 17 June 2026 diff hist +7,983 N Acorn Archimedes A4000 Troubleshooting Guide Create: detailed troubleshooting (PSU rails/fuses, functional test suite, ARM250; cited) current