BBC Micro Model A/B: Revision history

25 September 2026

• curprev 02:3102:31, 25 September 2026 Josh talk contribs 12,236 bytes +288 Link the R. B. Coats BBC BASIC textbook and label it plainly as third-party with no hardware content undo

23 September 2026

• curprev 02:5602:56, 23 September 2026 Josh talk contribs 11,948 bytes +6,307 Rewrite against the hosted BBC Microcomputer Service Manual (Oct 1985). Corrected: ULA is Uncommitted not Unified and there are two (video 5C094 IC6, serial 2C199 IC7); mode 2 has 16 logical colours not 8; modes 0,1,4,5 are 32 text rows not 25; modes 3 and 6 are text-only; there are no ROM cartridge slots, only four internal sideways ROM sockets; ROM is 16K MOS plus 16K language plus four paged sockets, not 32K total; cassette is 300 or 1200 baud. Removed unsourced dimensions, weight and 7-oc... undo

5 September 2025

• curprev 00:4200:42, 5 September 2025 Josh talk contribs 5,641 bytes −5 →🧪 Related Pages undo Tag: Visual edit

9 August 2025

• curprev 21:2721:27, 9 August 2025 Josh talk contribs 5,646 bytes −38 No edit summary undo Tag: Visual edit

9 May 2025

• curprev 21:1921:19, 9 May 2025 Josh talk contribs 5,684 bytes −70 →🔍 PCB Schematics & Service Manual undo
• curprev 21:1821:18, 9 May 2025 Josh talk contribs 5,754 bytes −259 No edit summary undo Tag: Visual edit
• curprev 21:1221:12, 9 May 2025 Josh talk contribs 6,013 bytes 0 No edit summary undo
• curprev 21:1221:12, 9 May 2025 Josh talk contribs 6,013 bytes +31 →🧪 Related Pages undo Tag: Visual edit
• curprev 21:0921:09, 9 May 2025 Josh talk contribs 5,982 bytes +5,982 Automated update by bot