The display has a third use: serial error annunciator. $D5F2 renders
'E0' + three live counters (TX-ring overflow $3187, reply retries
$3184, give-up teardowns $3185); $DAB8/$DAB2 is a terminal crash
screen spelling 'dEAd' when the TX dispatcher meets an unknown command
byte. Also recorded: RX overrun is unhandled (checksum NAKs are the only
symptom), unused vectors hang in BRA-self stubs, FAULT LED = MAX690 PFO,
manual/remote reset works by pulling PFI low, RUN LED = buffered AS*,
and the MAX690 watchdog is unconnected/unserviced — software wedges
persist until reset, matching bench observations.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
New display-board-1408.md: pin-level definition of the board's outputs
(8 multiplexed hex digits via ICM7228B, isolated LPT LED monitor block,
no readback path) and, from the firmware disassembly, everything the RIO
puts on it: F0 boot banner, F1 test-mode banner (keypad sequence A-9-E
enters, D exits), and the sub-test displays — five live encoder-count
readouts, button test with input index, two lamp patterns, keypad test.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Four photos of the 1413 Rev. 1: component side with the bolt-on Pyramid
PB-150P, solder side (etch NT 1-0A 3695), and both faces of the Pyramid
module (inputs/level pots, speaker terminals/fuse/power). Photo index
updated.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Photos of the physical board (Rev. 1) show the amplification is a stock
Pyramid PB-150P Pro Plus 4-channel car amp mounted as a module; the VWE
board is passive: 12V/remote power distribution, per-corner 3-way
crossovers (Dale IHB-3 820uH/180uH, MMP film caps, CP-5 2R pads), 6-pin
woofer/mid/tweeter corner connectors, and the LED output-check circuit.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
galdecode.py applies the GAL20V8 complex-mode fuse geometry (tables from
MAME jedutil.cpp) to GAL20v8a_5764.JED with pin names from schematic
sheet 1. Result triple-checks: schematic net names, firmware $A0xx
accesses, and the chip's UES signature — which VWE programmed as 'U7'.
Memory map: $2000-$9FFF SRAM (E-qualified), $A000 display write port,
$A010 pod-bus latch, $A020-$A03F HCTL-2016 counters (A3 byte select
via NOT_A3), $C000-$FFFF EPROM (explains the FF-padded dump), with
OE* = E&R/W as the shared read enable.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Organize the restoration source material under docs/hardware/:
- 9 board photos (renamed from Signal timestamps, index in README)
- Scans_018-014.pdf: 7-sheet VWE schematic set (RIO_1407 CPU/power/IO,
PBE_1401 buttons, KEY_1402 keypad, DSP_1408 display, AMP_PLT 1413 amp)
- GAL20v8a_5764.JED: fuse map of the 1407's U7 memory decoder
README documents the board family, the 68HC11 memory map decode path,
the pod-bus signal set and jumper addressing, and cross-links PROTOCOL.md
and rio-firmware/.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
CydandClaude Fable 5