Paged Roms
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Paged roms exist within the 16K address block 0x8000…0xBFFF.
The following table shows the layout of the Paged Roms on a Standard Machines
| Rom # | BBC A & B | BBC B+ | Master 128 | Master Compact | Acorn Electron | |
|---|---|---|---|---|---|---|
| 15 | F | IC101 AUX ROM, usually Basic or Basic II |
IC71 BASIC II or Sideways RAM (B+ 128K only) |
Terminal | Utilities | External ROM +1, Slogger etc |
| 14 | E | IC100 AUX ROM usually empty |
View | BASIC IV | ||
| 13 | D | IC88 "Disk & Net ROM" typically empty |
Sideways RAM (B+ 128K only) |
ADFS | ADFS 2.10 | |
| 12 | C | IC52 BASIC ROM typically containing DFS |
Basic | System top 16k | ||
| 11 | B | Mapped to slot 0xF | IC68 DFS 2.26 + SRAM 1.05 |
Edit | System 2nd 16k | IC 2 BASIC II |
| 10 | A | Mapped to slot 0xE | Viewsheet | System 3rd 16k | ||
| 9 | 9 | Mapped to slot 0xD | IC62 RAM | DFS | System 4th 16k | Keyboard is mapped here |
| 8 | 8 | Mapped to slot 0xC | IC62 RAM | IC27 Internal Socket | IC29 | |
| 7 | 7 | Mapped to slot 0xF | IC57 RAM | RAM or IC37 | RAM | External ROM Internal rom must be disabled use *FX142,n to select |
| 6 | 6 | Mapped to slot 0xE | IC57 RAM | RAM or IC37 | RAM | |
| 5 | 5 | Mapped to slot 0xD | IC44 RAM | RAM or IC41 | RAM | |
| 4 | 4 | Mapped to slot 0xC | IC44 RAM | RAM or IC41 | RAM | |
| 3 | 3 | Mapped to slot 0xF | IC35 RAM | SK4 Front Cartridge slot |
IC17 | |
| 2 | 2 | Mapped to slot 0xE | IC35 RAM | IC23 | ||
| 1 | 1 | Mapped to slot 0xD | Sideways RAM (B+128K only) or BASIC II (alternate location) |
SK3 Rear Cartridge slot |
IC38 or expansion port | |
| 0 | 0 | Mapped to slot 0xC | IC38 or expansion port | |||
Last modified October 25, 2021: Fix paged rom page (f85cecc)