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Ilia Sharin 2026-04-26 14:46:18 -04:00
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01_hardware/ecs_a600_a3000/chip_ram_expansion.md
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@ -35,9 +35,9 @@ ULONG chip_free = AvailMem(MEMF_CHIP);
ULONG chip_total = AvailMem(MEMF_CHIP | MEMF_TOTAL);
```
The exec memory list is built at boot time from the chip RAM size detected by the ROM initialisation code, which queries Agnus's internal address counter.
The exec memory list is built at boot time from the chip RAM size detected by the ROM initialization code, which queries Agnus's internal address counter.
## AmigaOS ROM Initialisation (Exec init)
## AmigaOS ROM Initialization (Exec init)
During cold boot, the Kickstart ROM probes Chip RAM size:
@ -45,7 +45,7 @@ During cold boot, the Kickstart ROM probes Chip RAM size:
2. Read back — if the value matches, 2 MB Chip RAM is present
3. The exec `MemHeader` for Chip RAM is extended to $1FFFFF
This is performed in the `RomBoot()` → `InitCode()` sequence before the exec memory system is fully initialised.
This is performed in the `RomBoot()` → `InitCode()` sequence before the exec memory system is fully initialized.
## Implications for Programming