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feat(v4): the machine has a ROM -- read and run, never written

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A read-only range of V4_ROM_WORDS words at V4_ROM_BASE, above RAM
(MACHINE.md 2, DATASHEET-F18.md 5).  Instruction fetch, @p and data fetches
read it; a running programme's store there is an address fault.  Attached by
the owner like every device; a reset detaches it.  The host node's range is
4096 words.  text.c places branches by the whole address space.  The
nucleus image is byte-identical.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
rajames
2026-10-15 11:25:24 -04:00
co-authored by Claude Opus 5.5
parent 42f8a13914
commit 32753f5479
7 changed files with 165 additions and 11 deletions
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docs/v4.0.0/DATASHEET-F18.md
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@@ -98,7 +98,7 @@ registers (§10.3).
the console receive addresses, where a store goes to RAM.
- **ROM.** Designed, not built: `MACHINE.md` §2, and plan Task 1. It is a read-only range at
`V4_NODE_WORDS` and above. It can be fetched and executed. A store there is an address fault.
A reset keeps it.
In the model it is attached by the owner, as every device is, and a reset detaches it.
- Its routines are shared code, GA144-style (`MACHINE.md` 2.1). Payloads call them through
the entry table at the ROM's base. Their state lives in a reserved RAM area. This sheet will
list each entry's stack effect and the registers it uses once the ROM is built.