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filestore.js
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// Level-3 file server emulator ported from FSEM2
// https://github.com/mmbeeb/FSEM
"use strict";
import { ReceiveBlock, EconetPacket } from "./econet.js";
import * as utils from "./utils.js";
export class Filestore {
constructor(cpu, econet) {
this.cpu = cpu;
this.econet = econet;
this.scsi = [];
this.l3fs = [];
this.pollCount = 0;
this.ram = new Uint8Array((64 + 32) * 1024);
this.emulationSpeed = 0;
this.logTemp = "";
this.A = this.X = this.Y = this.SP = this.M = 0;
this.PC = this.XPC = this.L = this.R = 0;
this.N = this.V = this.Z = this.C = this.F = 0;
}
GBYTE() {
return this.ram[this.PC++];
}
GWORD() {
return this.ram[this.PC++] | (this.ram[this.PC++] << 8);
}
WORD(l) {
return this.ram[l] | (this.ram[l + 1] << 8);
}
PUSH(m) {
this.ram[0x100 + this.SP] = m;
this.SP--;
this.SP &= 0xff;
}
PULL() {
this.SP++;
this.SP &= 0xff;
return this.ram[0x100 + this.SP];
}
NZ(v) {
v &= 0xff;
this.Z = 0 | (v === 0x00);
this.N = 0 | (v >= 0x80);
return v;
}
oswrch(char) {
if (this.emulationSpeed === 0) {
// During startup, run the FS emulation at full speed and log output
if (char >= 32 && char <= 127) {
this.logTemp += String.fromCharCode(char);
}
if (char === 13) {
console.log("Filestore: " + this.logTemp.trim());
if (this.logTemp.includes("Starting")) {
this.emulationSpeed = 20; // Once started up, we can slow down the emulation considerably
}
this.logTemp = "";
}
}
}
osword() {
let p = (this.Y << 8) | this.X;
switch (this.A) {
case 0x0: {
// Read line (put '1' into buffer, Drives/stations = 1)
let k = this.ram[p] | (this.ram[p + 1] << 8);
this.ram[k] = 49; // '1'
this.ram[k + 1] = 13;
this.Y = 1;
this.C = 0;
this.oswrch(49); // '1'
break;
}
case 0x0e: {
const current = new Date();
this.ram[p] = current.getFullYear() - 2000;
this.ram[p + 1] = current.getMonth() + 1;
this.ram[p + 2] = current.getDate();
this.ram[p + 3] = current.getDay() + 1;
this.ram[p + 4] = current.getHours();
this.ram[p + 5] = current.getMinutes();
this.ram[p + 6] = current.getSeconds();
break;
}
case 0x10: {
// Transmit
let stationId = this.ram[p + 2];
if (stationId !== 0xff) {
let bufstart =
(this.ram[p + 4] |
(this.ram[p + 5] << 8) |
(this.ram[p + 6] << 16) |
(this.ram[p + 7] << 24)) >>>
0;
let bufend =
(this.ram[p + 8] |
(this.ram[p + 9] << 8) |
(this.ram[p + 10] << 16) |
(this.ram[p + 11] << 24)) >>>
0;
let length = bufend - bufstart;
if (bufstart >= 0x10000) bufstart = (bufstart & 0xffff) | 0x10000;
this.econet.serverTx = new EconetPacket(stationId, 0, 254, 0);
this.econet.serverTx.controlFlag = this.ram[p];
this.econet.serverTx.port = this.ram[p + 1];
for (let i = 0; i < length; i++) {
this.econet.serverTx.buffer[i + 4] = this.ram[bufstart + i];
}
this.econet.serverTx.bytesInBuffer = 4 + length;
}
break;
}
case 0x11: {
// Receive
if (this.ram[p + 0] === 0) {
// Create new receive block
let rxBuffer = new ReceiveBlock(
this.econet.nextReceiveBlockNumber,
this.ram[p + 1],
this.ram[p + 2],
(this.ram[p + 5] |
(this.ram[p + 6] << 8) |
(this.ram[p + 7] << 16) |
(this.ram[p + 8] << 24)) >>>
0,
(this.ram[p + 9] |
(this.ram[p + 10] << 8) |
(this.ram[p + 11] << 16) |
(this.ram[p + 12] << 24)) >>>
0
);
this.econet.receiveBlocks.push(rxBuffer);
this.ram[p] = this.econet.nextReceiveBlockNumber;
this.econet.nextReceiveBlockNumber++;
this.econet.nextReceiveBlockNumber &= 0xff;
if (this.econet.nextReceiveBlockNumber === 0) {
this.econet.nextReceiveBlockNumber = 1;
}
//console.log("Filestore: new receive block " + rxBuffer.id + " " + rxBuffer.receivePort.toString(16) + " " + rxBuffer.bufferStart.toString(16) + " " + rxBuffer.bufferEnd.toString(16));
} // Read and delete receive block
else {
let rxblock = this.econet.receiveBlocks.find((e) => e.id === this.ram[p + 0]);
if (rxblock.bufferStart + rxblock.data.bytesInBuffer - 4 < rxblock.bufferEnd) {
rxblock.bufferEnd = rxblock.bufferStart + rxblock.data.bytesInBuffer - 4;
}
this.ram[p + 1] = rxblock.controlFlag;
this.ram[p + 2] = rxblock.receivePort;
this.ram[p + 3] = rxblock.stationId;
this.ram[p + 4] = 0;
this.ram[p + 5] = rxblock.bufferStart & 0xff;
this.ram[p + 6] = (rxblock.bufferStart >>> 8) & 0xff;
this.ram[p + 7] = (rxblock.bufferStart >>> 16) & 0xff;
this.ram[p + 8] = (rxblock.bufferStart >>> 24) & 0xff;
this.ram[p + 9] = rxblock.bufferEnd & 0xff;
this.ram[p + 10] = (rxblock.bufferEnd >>> 8) & 0xff;
this.ram[p + 11] = (rxblock.bufferEnd >>> 16) & 0xff;
this.ram[p + 12] = (rxblock.bufferEnd >>> 24) & 0xff;
// Copy buffer contents to FS memory
let bufferStart = rxblock.bufferStart;
if (bufferStart >= 0x10000) bufferStart = (bufferStart & 0xffff) | 0x10000;
for (let i = 0; i < rxblock.bufferEnd - rxblock.bufferStart; i++) {
this.ram[bufferStart + i] = rxblock.data.buffer[i + 4];
}
this.econet.deleteReceiveBlock(this.ram[p]);
//console.log("Filestore: read and delete receive block " + this.ram[p]);
}
break;
}
case 0x13:
this.ram[p + 1] = 254; // Station ID
break;
case 0x72: {
// SCSI handling
let addr =
(this.ram[p + 1] | (this.ram[p + 2] << 8) | (this.ram[p + 3] << 16) | (this.ram[p + 4] << 24)) >>>
0;
if (addr >= 0x10000) addr = (addr & 0xffff) | 0x10000; //host memory
let result = 4,
sec = ((this.ram[p + 6] & 0x1f) << 16) | (this.ram[p + 7] << 8) | this.ram[p + 8];
let len = this.ram[p + 9] * 0x100; // SCSI_SECSIZE
if (!len)
len =
this.ram[p + 11] |
((this.ram[p + 12] << 8) | (this.ram[p + 13] << 16) | ((this.ram[p + 14] << 24) >>> 0));
switch (this.ram[p + 5]) {
case 0x08: //read
case 0x0a: //write
if (this.ram[p + 5] === 0x08) {
// read
for (let i = sec * 0x100; i < sec * 0x100 + len; i++) {
this.ram[addr++] = this.scsi[i];
}
} // write
else
for (let i = sec * 0x100; i < sec * 0x100 + len; i++) {
this.scsi[i] = this.ram[addr++];
}
result = 0;
break;
default:
break;
}
this.ram[p] = result;
break;
}
case 0x73:
this.ram[p] = 0; //sector
this.ram[p + 1] = 0;
this.ram[p + 2] = 0;
this.ram[p + 3] = 0;
this.ram[p + 4] = 0;
break;
default:
console.log("Filestore: unhandled osword 0x" + this.A.toString(16));
break;
}
}
osbyte() {
switch (this.A) {
case 0x0d:
case 0x0e:
case 0x0f:
break;
case 0x32: // Poll transmit block
if (this.econet.serverTx.bytesInBuffer > 0) {
this.X = 0x80;
} else {
this.X = 0;
}
break;
case 0x33: {
// Poll receive block
let rxblock = this.econet.receiveBlocks.find((e) => e.id === this.X);
this.X = 0;
if (rxblock) {
this.X = rxblock.controlFlag;
if (this.X >= 0x80) {
this.X = rxblock.controlFlag;
//console.log("osbyte found received block id " + rxblock.id + " " + this.X.toString(16) + " " + this.Y.toString(16));
}
}
break;
}
case 0x34:
this.econet.deleteReceiveBlock(this.X);
break;
case 0x35:
break;
case 0x85:
this.X = 0;
this.Y = 32 << 2;
break;
case 0x86:
this.X = this.Y = 0;
break;
case 0x87:
case 0x96:
case 0x97:
break;
case 0xb4:
this.X = 0;
break;
case 0xe5:
break;
default:
console.log("Filestore: unhandled osbyte 0x" + this.A.toString(16));
break;
}
}
reset() {
console.log("Filestore: initialisation");
const filestoreRef = this;
utils.loadData("econet/L3FS.dat").then(function (data) {
filestoreRef.l3fs = data;
for (let i = 0; i < data.length; i++) {
filestoreRef.ram[0x400 + i] = data[i];
}
filestoreRef.PC = 0x400;
filestoreRef.SP = 0xff;
filestoreRef.A = 1;
});
utils.loadData("econet/scsi.dat").then(function (data) {
filestoreRef.scsi = data;
});
}
polltime(cycles) {
this.pollCount += cycles;
if (this.pollCount > this.emulationSpeed) {
this.pollCount = 0;
// Decode and execute next instruction
let op,
i,
i2,
j = 0;
this.XPC = this.PC;
if (this.PC >= 0xf800) op = 0x60; //ROM, read rts
else op = this.GBYTE();
i = op & 0x1f; //row
i2 = i & 0x03;
j = op >> 5; //column
if (i === 0 && j < 4) {
//all implicit except JSR
switch (j) {
case 0: //brk
this.PC = this.WORD(0x0202); //BRKV
break;
case 1: //jsr, absolute
this.L = this.GWORD();
this.PUSH(--this.PC >> 8);
this.PUSH(this.PC);
this.PC = this.L;
break;
case 2: //rti
break;
case 3: //rts
this.PC = this.PULL();
this.PC |= this.PULL() << 8;
this.PC++;
break;
}
} else if (i === 8) {
//all implicit
switch (j) {
case 0: //php
this.M = (this.N << 7) | (this.V << 6) | (this.Z << 1) | this.C;
this.PUSH(this.M);
break;
case 1: //plp
this.M = this.PULL();
this.N = (this.M & 0x80) > 0;
this.V = (this.M & 0x40) > 0;
this.Z = (this.M & 2) > 0;
this.C = this.M & 1;
break;
case 2: //pha
this.PUSH(this.A);
break;
case 3: //pla
this.A = this.NZ(this.PULL());
break;
case 4: //dey
this.Y--;
this.Y &= 0xff;
this.NZ(this.Y);
break;
case 5: //tay
this.Y = this.NZ(this.A);
break;
case 6: //iny
this.Y++;
this.Y &= 0xff;
this.NZ(this.Y);
break;
case 7: //inx
this.X++;
this.X &= 0xff;
this.NZ(this.X);
break;
}
} else if (i === 10 && j > 3) {
//all implicit
switch (j) {
case 4: //txa
this.A = this.NZ(this.X);
break;
case 5: //tax
this.X = this.NZ(this.A);
break;
case 6: //dex
this.X--;
this.X &= 0xff;
this.NZ(this.X);
break;
case 7: //nop
break;
}
} else if (i === 16) {
//branch, all relative
let flag = ~j & 1;
switch (j >> 1) {
case 0:
flag ^= this.N;
break;
case 1:
flag ^= this.V;
break;
case 2:
flag ^= this.C;
break;
case 3:
flag ^= this.Z;
break;
}
this.M = this.GBYTE();
if (flag) {
if (this.M & 0x80) this.PC -= 0x100;
this.PC += this.M;
}
} else if (i === 24) {
//all implicit
switch (j) {
case 0: //clc
this.C = 0;
break;
case 1: //sec
this.C = 1;
break;
case 2: //cli
break;
case 3: //sei
break;
case 4: //tya
this.A = this.NZ(this.Y);
break;
case 5: //clv
this.V = 0;
break;
case 6: //cld
break;
case 7: //sed
break;
}
} else if (i === 26) {
//all implicit
if (j & 1)
//tsx
this.X = this.NZ(this.SP);
//txs
else this.SP = this.X;
} else {
//multiple address modes
let acc = 0,
imm = 0,
store = 0;
if (i === 10) {
acc = 1;
} else {
if (i === 1) {
//(zp,X)
this.L = this.GBYTE() + this.X;
this.L = this.WORD(this.L);
} else if (i === 25 || op === 190) {
//LDX abs,Y
this.L = this.GWORD() + this.Y;
} else {
switch (i >> 2) {
case 0: //#
case 2: //#
imm = 1;
break;
case 1: //zp
this.L = this.GBYTE();
break;
case 3: //abs
this.L = this.GWORD();
break;
case 4: //(zp),Y
this.L = this.GBYTE();
this.L = this.WORD(this.L) + this.Y;
break;
case 5:
if (op === 150)
//STX zp,Y
this.L = this.GBYTE() + this.Y;
//zp,X
else this.L = this.GBYTE() + this.X;
break;
case 7: //abs,X
this.L = this.GWORD() + this.X;
break;
}
}
}
if (acc) this.M = this.A;
else if (imm) this.M = this.GBYTE();
else this.M = this.ram[this.L];
switch (i2) {
case 0:
switch (j) {
case 1: //bit
this.NZ(this.A & this.M);
this.V = (this.M & 0x40) > 0;
this.N = (this.M & 0x80) > 0;
break;
case 2: //jmp absolute
this.PC = this.L;
break;
case 3: //jmp indirect
this.PC = this.WORD(this.L);
break;
case 4: //sty
this.M = this.Y;
store = 1;
break;
case 5: //ldy
this.Y = this.NZ(this.M);
break;
case 6: //cpy
this.NZ(this.Y - this.M);
this.C = this.Y >= this.M;
break;
case 7: //cpx
this.NZ(this.X - this.M);
this.C = this.X >= this.M;
break;
}
break;
case 1:
switch (j) {
case 0: //ora
this.A = this.NZ(this.A | this.M);
break;
case 1: //and
this.A = this.NZ(this.A & this.M);
break;
case 2: //eor
this.A = this.NZ(this.A ^ this.M);
break;
case 7: //sbc
this.M = ~this.M & 0xff;
// falls through
case 3: //adc
this.R = this.A + this.M + this.C;
this.C = this.R >= 0x100;
this.V = ((this.A ^ this.R) & (this.M ^ this.R) & 0x80) > 0;
this.A = this.NZ(this.R);
break;
case 4: //sta
this.M = this.A;
store = 1;
break;
case 5: //lda
this.A = this.NZ(this.M);
break;
case 6: //cmp
this.NZ(this.A - this.M);
this.C = this.A >= this.M;
break;
}
break;
case 2:
store = 1;
switch (j) {
case 0: //asl
this.C = 0;
// falls through
case 1: //rol
this.F = (this.M & 0x80) > 0;
this.M = this.NZ((this.M << 1) | this.C);
this.C = this.F;
break;
case 2: //lsr
this.C = 0;
// falls through
case 3: //ror
this.F = this.M & 1;
this.M = this.NZ((this.M >> 1) | (this.C << 7));
this.C = this.F;
break;
case 4: //stx
this.M = this.X;
break;
case 5: //ldx
this.X = this.NZ(this.M);
store = 0;
break;
case 6: //dec
this.M--;
this.M &= 0xff;
this.NZ(this.M);
break;
case 7: //inc
this.M++;
this.M &= 0xff;
this.NZ(this.M);
break;
}
break;
}
if (store) {
if (acc) this.A = this.M;
else this.ram[this.L] = this.M;
}
}
// Have we been asked to execute an OS ROM call?
if (this.PC >= 0xf800) {
switch (this.PC) {
case 0xf800: //reset
break;
case 0xffe0: //OSRDCH
this.A = 83; // The letter 'S' (tells FS3 to start)
this.C = 0;
break;
case 0xfff1: //OSWORD
this.osword();
break;
case 0xfff4: //OSBYTE
this.osbyte();
break;
case 0xffe7: //OSNEWL
case 0xffe3: //OSASCI
case 0xffee: //OSWRCH
this.oswrch(this.A);
break;
case 0xfff7: //OSCLI
break;
default:
break;
}
}
}
}
}