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// v1 (BEMSNAP1): Fixed-size 327,885 byte packed struct. Reference: beebjit state.c
// v3 (BEMSNAP3): Section-based with key+size headers, zlib-compressed memory. Reference: b-em savestate.c
import { volumeTable, buildVideoState, buildSnapshot } from "./snapshot-helpers.js";
import { inflate } from "./archive.js";
const BemV1Size = 327885;
// v1 struct offsets
const V1Off = {
signature: 0,
model: 8,
a: 9,
x: 10,
y: 11,
flags: 12,
s: 13,
pc: 14,
nmi: 16,
interrupt: 17,
cycles: 18,
fe30: 22,
fe34: 23,
ram: 24,
rom: 24 + 65536,
sysvia: 24 + 65536 + 262144,
};
/**
* Check if an ArrayBuffer looks like a b-em snapshot (any version).
* @param {ArrayBuffer} buffer
* @returns {boolean}
*/
export function isBemSnapshot(buffer) {
if (buffer.byteLength < 8) return false;
const sig = String.fromCharCode(...new Uint8Array(buffer, 0, 7));
return sig === "BEMSNAP";
}
/**
* Parse a b-em snapshot (v1 or v3) into a jsbeeb snapshot object.
* @param {ArrayBuffer} buffer
* @returns {object} jsbeeb snapshot
*/
export async function parseBemSnapshot(buffer) {
Iif (buffer.byteLength < 8) throw new Error("File too small to be a b-em snapshot");
const bytes = new Uint8Array(buffer);
const sig = String.fromCharCode(...bytes.slice(0, 8));
if (sig === "BEMSNAP1") return parseBemV1(buffer);
if (sig === "BEMSNAP3") return parseBemV3(buffer);
throw new Error(`Unsupported b-em snapshot version: "${sig}"`);
}
// ── Shared helpers ──────────────────────────────────────────────────
function readViaFromBytes(data, offset) {
const view = new DataView(data.buffer, data.byteOffset + offset);
return {
ora: data[offset],
orb: data[offset + 1],
ira: data[offset + 2],
irb: data[offset + 3],
// +4, +5 are port read values (ignored on load, matching b-em via_loadstate)
ddra: data[offset + 6],
ddrb: data[offset + 7],
sr: data[offset + 8],
acr: data[offset + 9],
pcr: data[offset + 10],
ifr: data[offset + 11],
ier: data[offset + 12],
t1l: view.getInt32(13, true),
t2l: view.getInt32(17, true),
t1c: view.getInt32(21, true),
t2c: view.getInt32(25, true),
t1hit: data[offset + 29],
t2hit: data[offset + 30],
ca1: data[offset + 31],
ca2: data[offset + 32],
};
}
const ViaDataSize = 33; // 13 bytes + 4*4 timer ints + 4 booleans
function readCpuFromBytes(data) {
return {
a: data[0],
x: data[1],
y: data[2],
flags: data[3],
s: data[4],
pc: data[5] | (data[6] << 8),
nmi: data[7],
interrupt: data[8],
cycles: data[9] | (data[10] << 8) | (data[11] << 16) | (data[12] << 24),
};
}
function convertViaState(bemVia, ic32) {
const result = {
ora: bemVia.ora,
orb: bemVia.orb,
ira: bemVia.ira,
irb: bemVia.irb,
ddra: bemVia.ddra,
ddrb: bemVia.ddrb,
sr: bemVia.sr,
acr: bemVia.acr,
pcr: bemVia.pcr,
ifr: bemVia.ifr,
ier: bemVia.ier,
t1l: bemVia.t1l,
t2l: bemVia.t2l,
t1c: bemVia.t1c,
t2c: bemVia.t2c,
t1hit: bemVia.acr & 0x40 ? false : !!bemVia.t1hit,
t2hit: !!bemVia.t2hit,
portapins: 0xff,
portbpins: 0xff,
ca1: !!bemVia.ca1,
ca2: !!bemVia.ca2,
cb1: false,
cb2: false,
justhit: 0,
t1_pb7: (bemVia.orb >> 7) & 1,
lastPolltime: 0,
taskOffset: 1,
};
if (ic32 !== undefined) {
result.IC32 = ic32;
result.capsLockLight = !(ic32 & 0x40);
result.shiftLockLight = !(ic32 & 0x80);
}
return result;
}
function convertSoundState(snLatch, snCount, snStat, snVol, snNoise, snShift) {
const registers = new Uint16Array(4);
const counter = new Float32Array(4);
const outputBit = [false, false, false, false];
const volume = new Float32Array(4);
for (let i = 0; i < 4; ++i) {
const snChannel = 3 - i;
let period = snLatch[snChannel] >> 6;
let count = snCount[snChannel] >> 6;
if (i === 3) {
period >>= 1;
count >>= 1;
}
registers[i] = period;
counter[i] = count;
outputBit[i] = snStat[snChannel] < 16;
volume[i] = volumeTable[snVol[snChannel] & 0x0f];
}
registers[3] = snNoise & 0x07;
return {
registers,
counter,
outputBit,
volume,
lfsr: snShift,
latchedRegister: 0,
residual: 0,
sineOn: false,
sineStep: 0,
sineTime: 0,
};
}
// ── V1 parser (BEMSNAP1, fixed struct) ──────────────────────────────
function parseBemV1(buffer) {
Iif (buffer.byteLength !== BemV1Size) {
throw new Error(`Invalid BEM v1 snapshot size: expected ${BemV1Size}, got ${buffer.byteLength}`);
}
const bytes = new Uint8Array(buffer);
const view = new DataView(buffer);
const bemModel = bytes[V1Off.model];
if (bemModel !== 3 && bemModel !== 4) {
throw new Error(`Unsupported BEM v1 model: ${bemModel} (only BBC Model B supported)`);
}
const cpuState = {
...readCpuFromBytes(bytes.slice(V1Off.a)),
fe30: bytes[V1Off.fe30],
fe34: bytes[V1Off.fe34],
};
const ram = new Uint8Array(128 * 1024);
ram.set(bytes.slice(V1Off.ram, V1Off.ram + 65536));
const roms = bytes.slice(V1Off.rom, V1Off.rom + 262144);
const sysVia = readViaFromBytes(bytes, V1Off.sysvia);
const sysViaIC32 = bytes[V1Off.sysvia + ViaDataSize];
const userVia = readViaFromBytes(bytes, V1Off.sysvia + ViaDataSize + 1);
const ulaOff = V1Off.sysvia + ViaDataSize + 1 + ViaDataSize;
const ulaControl = bytes[ulaOff];
const ulaPalette = bytes.slice(ulaOff + 1, ulaOff + 17);
const crtcOff = ulaOff + 17;
const crtcRegs = bytes.slice(crtcOff, crtcOff + 18);
const soundOff = crtcOff + 18 + 7 + 4 + 1 + 4;
const snLatch = [],
snCount = [],
snStat = [],
snVol = [];
for (let i = 0; i < 4; i++) {
snLatch.push(view.getUint32(soundOff + i * 4, true));
snCount.push(view.getUint32(soundOff + 16 + i * 4, true));
snStat.push(view.getUint32(soundOff + 32 + i * 4, true));
snVol.push(bytes[soundOff + 48 + i]);
}
const snNoise = bytes[soundOff + 52];
const snShift = view.getUint16(soundOff + 53, true);
return buildSnapshot(
"b-em",
"B",
cpuState,
ram,
roms,
convertViaState(sysVia, sysViaIC32),
convertViaState(userVia),
buildVideoState(ulaControl, ulaPalette, crtcRegs),
convertSoundState(snLatch, snCount, snStat, snVol, snNoise, snShift),
);
}
// ── V3 parser (BEMSNAP3, section-based) ─────────────────────────────
// Variable-length integer encoding used by b-em v3
function readVar(data, pos) {
let value = 0;
let shift = 0;
while (pos.offset < data.length) {
const byte = data[pos.offset++];
value |= (byte & 0x7f) << shift;
Eif (byte & 0x80) break;
shift += 7;
}
return value;
}
function readString(data, pos) {
const len = readVar(data, pos);
const str = String.fromCharCode(...data.slice(pos.offset, pos.offset + len));
pos.offset += len;
return str;
}
// b-em writes the tube ULA as a raw struct dump. Version 2 is all single-byte fields, so it has
// no padding and can be read directly; version 1 used native ints and is not supported here.
const BemTubeUlaVersion = 2;
const BemTubeUlaOffsets = {
ph1: 0,
ph2: 24,
ph3: 25,
ph4: 27,
hp1: 29, // phl (byte 28) is a latch jsbeeb does not model
hp2: 30,
hp3: 31,
hp4: 33,
hstat: 35, // hpl (byte 34) likewise unmodelled
pstat: 39,
r1stat: 43,
ph1head: 45, // ph1tail (byte 44) matters only to b-em, which appends there
ph1count: 46,
ph3pos: 47,
hp3pos: 48,
};
const BemTubeUlaSize = 49;
const BemPh1Size = 24;
// 9 bytes of registers, then RAM, then ROM.
const BemTubeRegisterBytes = 9;
const BemTubeRamSize = 65536;
// b-em's other co-processors are different CPUs, and its "6502 Turbo" has 16MB of RAM.
const BemSupportedTubes = ["6502 Internal", "6502 External"];
/**
* Convert b-em's tube sections into jsbeeb tube state.
* @param {object} sections - parsed v3 sections
* @param {string|null} tubeName - co-processor name from the model section
* @returns {Promise<object|null>} jsbeeb tube state, or null if no usable co-processor
*/
async function parseBemTube(sections, tubeName) {
// b-em names the model's co-processor even when it failed to start one, so naming a tube but
// carrying no state for it is valid. Carrying only one of the two sections is not.
if (!sections["T"] && !sections["P"]) return null;
Iif (!sections["T"] || !sections["P"]) {
throw new Error("Truncated b-em snapshot: it holds only one of the two co-processor sections");
}
// b-em only writes these sections for a co-processor it started, which it always names.
if (!tubeName) {
throw new Error("Corrupt b-em snapshot: it holds co-processor state but names no co-processor");
}
if (!BemSupportedTubes.includes(tubeName)) {
throw new Error(
`Unsupported b-em co-processor "${tubeName}": jsbeeb only emulates the 64K 65C02 second processor`,
);
}
const ulaSection = sections["T"].data;
Iif (ulaSection[0] !== BemTubeUlaVersion) {
throw new Error(`Unsupported b-em tube ULA state version ${ulaSection[0]}`);
}
if (ulaSection.length < 2 + BemTubeUlaSize) {
throw new Error(
`Truncated b-em tube ULA state: expected ${2 + BemTubeUlaSize} bytes, got ${ulaSection.length}`,
);
}
const romPaged = !!ulaSection[1];
const ula = ulaSection.slice(2, 2 + BemTubeUlaSize);
const at = (field) => ula[BemTubeUlaOffsets[field]];
// b-em keeps the R1 FIFO as a circular buffer; jsbeeb shifts its contents down on read, so
// the bytes have to be linearised into the order jsbeeb expects to read them.
const ph1Count = at("ph1count");
const ph1Head = at("ph1head");
// Out-of-range counts would restore a FIFO jsbeeb's own reads could never have produced.
if (ph1Count > BemPh1Size || ph1Head >= BemPh1Size || at("ph3pos") > 2 || at("hp3pos") > 2) {
throw new Error("Corrupt b-em tube ULA state: FIFO counts out of range");
}
const ph1 = new Uint8Array(BemPh1Size);
for (let i = 0; i < ph1Count; i++) {
ph1[i] = ula[BemTubeUlaOffsets.ph1 + ((ph1Head + i) % BemPh1Size)];
}
// Those names come from a config file, so size is the real check. It cannot be exact: the
// trailing ROM's size comes from that same config, and b-em records it as zero if unset.
const parasite = inflate(sections["P"].data);
const romBytes = parasite.length - BemTubeRegisterBytes - BemTubeRamSize;
if (romBytes < 0 || romBytes > BemTubeRamSize) {
throw new Error(
`Unsupported b-em co-processor: expected ${BemTubeRamSize} bytes of parasite RAM, ` +
`but the state section holds ${parasite.length - BemTubeRegisterBytes}`,
);
}
return {
a: parasite[2],
x: parasite[3],
y: parasite[4],
p: parasite[5] | 0x30,
s: parasite[6],
pc: parasite[7] | (parasite[8] << 8),
// b-em's oldnmi is the NMI level as of the parasite's last instruction, so it may lag the
// line its ULA state implies. b-em's skipint has no jsbeeb equivalent and is dropped.
nmiLevel: !!parasite[1],
nmiEdge: false,
takeInt: false,
cycles: 0,
romPaged,
memory: parasite.slice(BemTubeRegisterBytes, BemTubeRegisterBytes + BemTubeRamSize),
// The parasite ROM is loaded from file at boot, so b-em's copy is not needed.
ula: {
internalStatusRegister: at("r1stat"),
hostStatus: ula.slice(BemTubeUlaOffsets.hstat, BemTubeUlaOffsets.hstat + 4),
parasiteStatus: ula.slice(BemTubeUlaOffsets.pstat, BemTubeUlaOffsets.pstat + 4),
parasiteToHostData: [
ph1,
Uint8Array.of(at("ph2")),
ula.slice(BemTubeUlaOffsets.ph3, BemTubeUlaOffsets.ph3 + 2),
Uint8Array.of(at("ph4")),
],
hostToParasiteData: [
Uint8Array.of(at("hp1")),
Uint8Array.of(at("hp2")),
ula.slice(BemTubeUlaOffsets.hp3, BemTubeUlaOffsets.hp3 + 2),
Uint8Array.of(at("hp4")),
],
parasiteToHostFifoByteCount1: ph1Count,
parasiteToHostFifoByteCount3: at("ph3pos"),
hostToParasiteFifoByteCount3: at("hp3pos"),
},
};
}
/**
* Read the co-processor name from b-em's model section, if one was fitted.
* @returns {string|null}
*/
function readBemTubeName(data, pos) {
for (let i = 0; i < 4; i++) readString(data, pos); // os, cmos, rom setup, fdc names
pos.offset += 6; // model flag bytes
const fitted = data[pos.offset++];
return fitted ? readString(data, pos) : null;
}
async function parseBemV3(buffer) {
const bytes = new Uint8Array(buffer);
let offset = 8; // Skip "BEMSNAP3" signature
const sections = {};
while (offset < bytes.length) {
let key = bytes[offset];
let size = bytes[offset + 1] | (bytes[offset + 2] << 8);
let headerSize = 3;
if (key & 0x80) {
// Extended size (4 bytes) for compressed sections
key &= 0x7f;
size |= (bytes[offset + 3] << 16) | (bytes[offset + 4] << 24);
headerSize = 5;
}
const sectionData = bytes.slice(offset + headerSize, offset + headerSize + size);
const keyChar = String.fromCharCode(key);
sections[keyChar] = { data: sectionData, compressed: headerSize === 5 };
offset += headerSize + size;
}
// Parse model section to determine jsbeeb model name.
// Use jsbeeb synonyms (from models.js) so findModel() resolves them.
let modelName = "B";
let tubeName = null;
Eif (sections["m"]) {
const pos = { offset: 0 };
const data = sections["m"].data;
readVar(data, pos); // curmodel index (skip)
const name = readString(data, pos);
tubeName = readBemTubeName(data, pos);
if (name.includes("Master")) {
Iif (name.includes("ADFS")) modelName = "MasterADFS";
else Iif (name.includes("ANFS")) modelName = "MasterANFS";
else modelName = "Master";
} else Iif (name.includes("1770")) {
if (name.includes("ADFS")) modelName = "B1770A";
else modelName = "B1770";
} else {
modelName = "B";
}
}
// Parse CPU
let cpuState = { a: 0, x: 0, y: 0, flags: 0x30, s: 0xff, pc: 0, nmi: 0, interrupt: 0, cycles: 0 };
if (sections["6"]) {
cpuState = readCpuFromBytes(sections["6"].data);
}
// Parse memory (zlib-compressed in v3)
const ram = new Uint8Array(128 * 1024);
let roms = null;
const memSection = sections["M"];
if (memSection) {
// Decompressed layout: 2 bytes (fe30, fe34) + 64KB RAM + 256KB ROM
const memData = inflate(memSection.data);
cpuState.fe30 = memData[0];
cpuState.fe34 = memData[1];
const ramStart = 2;
const ramSize = 64 * 1024;
ram.set(memData.slice(ramStart, ramStart + ramSize));
const romStart = ramStart + ramSize;
Eif (memData.length > romStart) {
roms = memData.slice(romStart, romStart + 262144);
}
}
return finishV3Parse(modelName, cpuState, ram, roms, sections, await parseBemTube(sections, tubeName));
}
function finishV3Parse(modelName, cpuState, ram, roms, sections, tube) {
// Parse system VIA
let sysvia = convertViaState(
{
ora: 0,
orb: 0,
ira: 0,
irb: 0,
ddra: 0,
ddrb: 0,
sr: 0,
acr: 0,
pcr: 0,
ifr: 0,
ier: 0,
t1l: 0x1fffe,
t2l: 0x1fffe,
t1c: 0x1fffe,
t2c: 0x1fffe,
t1hit: 1,
t2hit: 1,
ca1: 0,
ca2: 0,
},
0,
);
if (sections["S"]) {
const data = sections["S"].data;
const via = readViaFromBytes(data, 0);
const ic32 = data.length > ViaDataSize ? data[ViaDataSize] : 0;
sysvia = convertViaState(via, ic32);
}
// Parse user VIA
let uservia = convertViaState({
ora: 0,
orb: 0,
ira: 0,
irb: 0,
ddra: 0,
ddrb: 0,
sr: 0,
acr: 0,
pcr: 0,
ifr: 0,
ier: 0,
t1l: 0x1fffe,
t2l: 0x1fffe,
t1c: 0x1fffe,
t2c: 0x1fffe,
t1hit: 1,
t2hit: 1,
ca1: 0,
ca2: 0,
});
if (sections["U"]) {
uservia = convertViaState(readViaFromBytes(sections["U"].data, 0));
}
// Parse Video ULA
// v3 section layout (97 bytes):
// 1: ula_ctrl
// 16: ula_palbak[16] (raw palette register values)
// 64: nula_collook[16] (4 bytes each: R, G, B, A in Allegro RGBA format)
// 1: nula_pal_write_flag
// 1: nula_pal_first_byte
// 8: nula_flash[8]
// 1: nula_palette_mode
// ... (more NULA state follows)
let ulaControl = 0;
let ulaPalette = new Uint8Array(16);
let nulaCollook = null;
if (sections["V"]) {
const data = sections["V"].data;
ulaControl = data[0];
ulaPalette = data.slice(1, 17);
// Parse NULA collook if section is large enough (v3 has 97 bytes)
Eif (data.length >= 81) {
nulaCollook = new Int32Array(16);
for (let c = 0; c < 16; c++) {
const off = 17 + c * 4;
// b-em stores as R, G, B, A (Allegro format)
// jsbeeb uses ABGR format (Uint32 on little-endian = canvas RGBA)
const r = data[off];
const g = data[off + 1];
const b = data[off + 2];
const a = data[off + 3];
nulaCollook[c] = (a << 24) | (b << 16) | (g << 8) | r;
}
}
}
// Parse CRTC (18 regs + optional 7 counter bytes: vc, sc, hc, ma_lo, ma_hi, maback_lo, maback_hi)
let crtcRegs = new Uint8Array(18);
let crtcCounters = null;
if (sections["C"]) {
const data = sections["C"].data;
crtcRegs = data.slice(0, 18);
Eif (data.length >= 25) {
crtcCounters = {
vc: data[18],
sc: data[19],
hc: data[20],
ma: data[21] | (data[22] << 8),
maback: data[23] | (data[24] << 8),
};
}
}
// Parse sound
let soundChip = convertSoundState([0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0], 0, 1 << 14);
if (sections["s"]) {
const data = sections["s"].data;
const view = new DataView(data.buffer, data.byteOffset);
const snLatch = [],
snCount = [],
snStat = [],
snVol = [];
for (let i = 0; i < 4; i++) {
snLatch.push(view.getUint32(i * 4, true));
snCount.push(view.getUint32(16 + i * 4, true));
snStat.push(view.getUint32(32 + i * 4, true));
snVol.push(data[48 + i]);
}
const snNoise = data[52];
const snShift = view.getUint16(53, true);
soundChip = convertSoundState(snLatch, snCount, snStat, snVol, snNoise, snShift);
}
return buildSnapshot(
"b-em",
modelName,
cpuState,
ram,
roms,
sysvia,
uservia,
buildVideoState(ulaControl, ulaPalette, crtcRegs, nulaCollook, crtcCounters),
soundChip,
tube,
);
}
|