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docs(v4.0.0): MACHINE.md -- what it is for: a multi-user, multitasking OS that init.4th brings up

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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rajames
2026-10-15 05:52:47 -04:00
co-authored by Claude Opus 5.5
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@@ -25,6 +25,20 @@ The ROM is the only binary. It runs the same on the C engine and on the FPGA: on
same behaviour. Assemble FORTH from the trailer and the node is a FORTH machine. Assemble Lisp
and it would be a Lisp machine. The engine and the ROM do not change.
### 1.1 What it is for
This is an operating system, not a toy (Captain Bob, 2026-10-15). Once everything is assembled
and compiled, the system is a multi-user, multitasking operating system. That is all the boot
in section 3 makes.
Then the system's init, `init.4th`, brings it up:
- it turns on security;
- it starts the system a module at a time and a node at a time;
- whoever is logged in gets a prompt: Zuse, `rajames`, `00` to `09`, or whoever it is.
From the prompt a user can do anything, in FORTH. The operating system's utilities are written
in FORTH.
## 2. The ROM
**What it does.** It reads a named blob and acts on its type: