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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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v4/src/text.c
+1 -1
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@@ -216,7 +216,7 @@ static void place_branch(v4_text *t)
v4_asm *as = &t->as;
if (as->slot == 0) return;
if (!v4_iword_branch_legal(as->slot)
|| (v4_ucell)v4_iword_slot_mask(as->slot) < (v4_ucell)(V4_NODE_WORDS - 1u))
|| (v4_ucell)v4_iword_slot_mask(as->slot) < (v4_ucell)(V4_NODE_WORDS + V4_ROM_WORDS - 1u))
(void)v4_asm_label(as);
}