# Built-in sound and automatic multiple-choice feedback

Tested in installed VCC Plus 3.5.0 build 41 with its bundled CMOC toolchain,
using the public MCP interface and isolated 512 KB MC6809 workers.

- Correct answers use a rising pair of BASIC SOUND tones; incorrect answers
  use a lower falling pair. Both quiz modes use the built-in audio output.
  No Speech/Sound, Orchestra-90 or other sound cartridge is required.
- SOUND executes at normal CPU speed, then restores the faster graphics clock.
- Multiple choice displays correctness and the correct capital, plays its tone,
  waits 90 video ticks (1.5 seconds), then advances without a continue key.
- Typed answers retain Space-to-continue. A near spelling still offers retry
  or reveal before any result tone or point is awarded.

## Passed checks

- Full 50-question multiple-choice run: all states once, numbering 1–50,
  unique choices and state highlighting, expected 42/50 (84%), review, replay,
  and BASIC exit. No Space or Enter was sent to advance any question.
- An answer key was held across the timeout into Question 2 and for a further
  600 fields. The next question remained unanswered until release/new input.
- Full 50-question typed run: expected 47/50 (94%), two spelling corrections,
  casing, aliases, repeated spaces, transpositions, Backspace, long input,
  wrong capitals, reveal, review and exit. Feedback remained on Question 1
  after 300 additional idle fields, confirming typed mode still waits for Space.
- Release smoke test: correct and incorrect feedback, a readable pause,
  automatic advancement to Questions 2 and 3, expected score, and title Quit.
- Test, Debug and Release builds succeeded without compiler diagnostics.
- Host logic/geometry tests and byte-identical asset regeneration passed.

## Sound verification and limitation

The linked CMOC SOUND wrapper calls Color BASIC at $A951. Framebuffer receipts
sampled the emulated PC at $A98C/$A98D during correct and incorrect playback,
confirming execution of the built-in ROM tone path. The public MCP tools do not
export audio samples, so no recording or listening test is claimed. A reusable
VCC enhancement would add field-aligned PCM/WAV capture to disposable playtests
so pitch, duration and silence can be checked without extra cartridges.

## Files and build details

Project headers are now quiz.h, ui.h and map_data.h beside main.c. VCC's build
snapshot omitted the nested include directory; root headers build and share
correctly through the documented interface. Make rules and asset generation
use the same layout. Explicit header dependencies replace CMOC dependency files
that could retain expired snapshot paths. Host tests now use a temporary executable
outside the shared checkout. Both a normal and an incremental native build passed
and produced byte-identical copies of the tested Release binary. No emulator or
compiler patch was needed.

Full PNG captures are in build/evidence/feedback/test and
build/evidence/feedback/release. Complete raw receipts and captures are preserved
in build/evidence/feedback-test.zip and feedback-release.zip. The original
captures remain directly viewable and their full raw evidence is preserved in
build/evidence/baseline.zip. Archives prevent generated JSON receipts from
unnecessarily expanding the assistant's project-sharing scope. Curated receipts
are in docs/evidence/feedback-*.json.

The Release build is `789DA457-9E69-4746-A833-801EC9F019DA`; artifact
`55C22401-B69A-40A4-9C04-C00281007402`. Code/static storage ends at `$7600`,
below the `$7800` limit, with the separate 2 KiB stack budget unchanged.

- build/CAPITAL.bin SHA-256: `6e9fd266f3ea0987430e173bf421ab0d8f2a3e9e0359c048050dfeadcf8bfe02`
- build/CAPITAL.dsk SHA-256: `d9464356aadaa53b2f8e74aa7b50ba8f96f900950747408ddfa077a2867c3b4f`

The previous generated binary/disk are preserved in build/previous. All guest
playtests report zero disk writes and used disposable copies of their disks.