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feat(v4.0.0): KEY and ?TERMINAL on the console registers

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?TERMINAL reads CONSOLE-STATUS; KEY polls it until a character is
pending and then takes it from CONSOLE-RX.  Executed on the golden
model at both cell widths, including a transcript of the v3 binary, and
KEY shown still waiting after 5000 instruction words with no input.

v3's KEY returned -1 at the end of its input; here KEY waits.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
rajames
2026-10-03 20:53:56 -04:00
co-authored by Claude Opus 5.5
parent 2c16183788
commit 861f800b7f
2 changed files with 129 additions and 6 deletions
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docs/v4.0.0/DECOMPOSITION.md
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@@ -148,7 +148,7 @@ times, as on the F18. `FOR ... UNEXT` is the same but the body must fit in one i
**Register conventions.** `A` and `B` are caller-saved. A word that uses them says so. Words in this
document that clobber `A`: `@ ! +! -! 2@ 2! C@ C! D2/ M* FILL ERASE MOVE COUNT CMOVE CMOVE> BLANK -TRAILING COMPARE SEARCH SCAN SKIP DECIMAL HEX OCTAL UM* * UM/MOD Q.FROM-INT Q.TO-INT Q.* Q./ Q.EXP Q.SQRT Q.LOG Q.SIN Q.COS +LOOP J HOLD SIGN # #S . .R U. U.R D. D.R ? DUMP Q.PRINT TYPE SEND RECV`. Words that clobber `B`:
`COMPARE SEARCH Q./ Q.EXP Q.SQRT Q.LOG Q.SIN Q.COS <# HOLD SIGN # #S #> . .R U. U.R D. D.R ? DUMP Q.PRINT EMIT CR SPACE SPACES TYPE SEND RECV`.
`COMPARE SEARCH Q./ Q.EXP Q.SQRT Q.LOG Q.SIN Q.COS <# HOLD SIGN # #S #> . .R U. U.R D. D.R ? DUMP Q.PRINT EMIT CR SPACE SPACES TYPE KEY ?TERMINAL SEND RECV`.
**Return-stack words** (`>R R> R@ 2>R 2R> 2R@ I J UNLOOP` and the loop runtimes) are always IN.
@@ -644,8 +644,8 @@ width and print a flood of spaces.
| Word | Fate | Notes |
| --- | --- | --- |
| `EMIT` | DEV | Console service: one-character message. Until the mesh exists it is a store to the `CONSOLE-TX` register (§7): `CONSOLE-TX b! !b`. As in v3, the low byte of the cell is the character. Executed on the golden model (2026-10-03). Clobbers `B`. |
| `KEY` | DEV | Console service: blocking receive. |
| `?TERMINAL` | DEV | Console service: non-blocking status. |
| `KEY` | DEV | Console service: blocking receive. Until the mesh exists it reads the `CONSOLE-STATUS` and `CONSOLE-RX` registers (§7): `L: CONSOLE-STATUS b! @b if WAIT drop CONSOLE-RX b! @b ; WAIT: drop jump L` — it asks whether a character is pending until one is, then takes it. The character is 0–255. v3's `KEY` returned −1 at the end of its input; here there is no end of input, and `KEY` waits. Executed on the golden model (2026-10-03), including a transcript of the v3 binary, and shown still waiting after 5000 instruction words with nothing pending. Leaves its caller 9 data cells and 8 return entries. Clobbers `B`. |
| `?TERMINAL` | DEV | Console service: non-blocking status. Until the mesh exists: `CONSOLE-STATUS b! @b` — −1 when a character is pending, 0 when not, as v3; it takes nothing. Executed on the golden model (2026-10-03). Clobbers `B`. |
| `TYPE` | CAP | `( baddr u -- )`. Loop of `C@ EMIT`, or one string message to the console node: `-if OK drop drop NODE-ERROR b! -1 !b ; OK: if DONE over C@ EMIT push 1 + pop -1 + jump OK DONE: drop drop ;` — nothing for `u = 0`; for `u < 0` nothing is printed and `NODE-ERROR` is set, where v3 printed nothing and raised its error flag. The address range is not checked (out-of-range addressing is still open, `node.h`). Executed on the golden model (2026-10-03). Leaves its caller 6 data cells and 6 return entries. Clobbers `A` and `B`. |
| `CR` | CAP | `10 EMIT`, as `10 jump EMIT` — executed on the golden model (2026-10-03). Character 10, as v3; the console turns it into a new line. |
| `SPACE` | CAP | `BL EMIT`, as `32 jump EMIT` — executed on the golden model (2026-10-03). |
@@ -959,3 +959,5 @@ Addresses are assigned in the node memory map (D-4). Names only here.
| `PORT-STATUS` | R | Per-port ready flags, for non-blocking polls. |
| `NODE-ERROR` | R/W | Arithmetic error flag: set to −1 by `Q./` on division by zero (D-11), by `Q.SQRT` / `Q.LOG` outside their domain (D-12) and by `HOLD` on a bad character or a full buffer (D-13), cleared by writing 0. `VM-ERROR?` reads it. |
| `CONSOLE-TX` | W | Console transmit: a store sends the low 8 bits of the value as one character. This is what `EMIT` writes to. On the single-node golden model it is a capture register: the character is appended to a buffer on the node and memory is not written (`v4_node_console_attach`, `v4/include/v4/node.h`), so printing words can be run and their output compared with v3's. With the mesh (step 2) it becomes the port to the console node. |
| `CONSOLE-RX` | R | Console receive: a fetch gives the next pending character, 0–255, and takes it; with none pending it gives −1 and takes nothing. This is what `KEY` reads. On the single-node golden model the characters come from a queue the test feeds (`v4_node_console_input_attach`, `v4_node_console_feed`, `v4/include/v4/node.h`). Only the data fetches `@`, `@+` and `@b` see the register; instruction words and literals at the same address are read as memory. With the mesh (step 2) it becomes the port from the console node, and a read with nothing pending will block instead. |
| `CONSOLE-STATUS` | R | Console receive status: a fetch gives −1 when a character is pending and 0 when not, and changes nothing. `?TERMINAL` reads it, and `KEY` polls it. On the mesh it is the console port's bit of `PORT-STATUS`. |