aiden/h8-536-decoder
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Emualtor improements

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Aiden
2026-05-25 18:55:50 +10:00
parent 05e1237acc
commit 1fabf6587d
10 changed files with 413 additions and 15 deletions
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@@ -78,8 +78,8 @@ To start the current emulator harness:
- Handles the E-clock transfer instructions `MOVFPE` and `MOVTPE`.
- Recognizes likely LCD E-clock access routines at `H'F200`/`H'F201`, including busy-flag polling and data/control writes.
- Generates a separate C-like pseudocode view from the JSON, preserving labels, calls, branches, register names, inferred symbols, metadata comments, optional cycle notes, and simple structured `if`/`do while` patterns.
- Provides an early H8/536 emulator harness with ROM/RAM/register memory mapping, reset-vector boot, SCI1 transmit capture, MOV condition-code updates, `SCB/F`, stack/call/return support, scaffolded SCI1 TXI/interval/FRT2-OCIA interrupt scheduling, a P9 bit-banged bus model, and an opt-in P9 transfer fast path.
- Includes an emulator probe that reports hot PCs, recent P9/SCI accesses, and captured P9 byte candidates while running the real ROM.
- Provides an early H8/536 emulator harness with ROM/RAM/register memory mapping, reset-vector boot, SCI1 transmit capture, MOV condition-code updates, `SCB/F`, stack/call/return support, scaffolded SCI1 TXI/interval/FRT1-OCIA/FRT2-OCIA interrupt scheduling, a P9 bit-banged bus model, and an opt-in P9 transfer fast path.
- Includes an emulator probe that reports hot PCs, recent P9/SCI accesses, final SCI1/TXI state, and captured P9 byte candidates while running the real ROM.
Current serial observations:
@@ -189,8 +189,9 @@ python h8536_emulator_probe.py --help
- `--trace`: print executed instructions.
- `--stop-on-heartbeat`: stop only if `00 00 00 00 80 DA` is emitted through SCI1 TDR.
- `--interval-steps N`: tune the scaffolded interval timer cadence.
- `--frt1-ocia-steps N` / `--frt2-ocia-steps N`: tune rough FRT compare-interrupt cadence.
- `--p9-fast-path`: shortcut known P9 transfer routines for exploration.
- Current status: boots from `H'1000`, initializes SCI1, models the first P9 bit-banged handshakes, captures P9 byte candidates, can optionally fast-path known P9 routines, and schedules FRT2 OCIA, but does not yet reach the SCI1 heartbeat. The next emulator work is validating the P9 fast-path semantics against real captures/board behavior and tightening SCI RX/TX interrupt cadence.
- Current status: boots from `H'1000`, initializes SCI1, models the first P9 bit-banged handshakes, captures P9 byte candidates, can optionally fast-path known P9 routines, and schedules FRT1/FRT2 OCIA. The probe now reaches the SCI1 transmit path, but still needs more timing/peripheral fidelity before it emits the full observed heartbeat frame.
## Code Layout