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More discussion on the PC-DOS 1.10 boot sector and how it compares to the COMPAQ 1.11 boot sector

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This commit is contained in:
Jeff Parsons 2017-07-01 12:21:06 -07:00 • committed by Jeff Parsons
commit 6d16f582c7
7 changed files with 474 additions and 307 deletions
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32
versions/pcx86/1.35.2/pcx86-uncompiled.js
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@ -58010,6 +58010,12 @@ class Disk extends Component {
for (i = 0; i < track.length; i++) {
track[i] = this.initSector(null, iCylinder, iHead, i + 1, drive.nBytes, 0);
}
/*
* TODO: This is more dodginess, because we can't be certain that every cylinder on the disk
* will receive the same "expanded" treatment, but functions like getSector() rely on instance
* properties (eg, this.nHeads), on the assumption that the disk's geometry is homogeneous.
*/
if (this.nHeads <= iHead) this.nHeads = iHead + 1;
}
if (track) {
for (i = 0; i < track.length; i++) {
@ -58052,6 +58058,12 @@ class Disk extends Component {
*/
if (!sector && drive.bFormatting && drive.bSector == 9) {
sector = track[i] = this.initSector(null, iCylinder, iHead, drive.bSector, drive.nBytes, 0);
/*
* TODO: This is more dodginess, because we can't be certain that every track on the disk
* will receive the same "expanded" treatment, but functions like getSector() rely on instance
* properties (eg, this.nSectors), on the assumption that the disk's geometry is homogeneous.
*/
if (this.nSectors < drive.bSector) this.nSectors = drive.bSector;
}
}
}
@ -60212,6 +60224,7 @@ class FDC extends Component {
while (this.loadDrive(iDrive, sDisketteName, sDiskettePath, false, file) < 0) {
if (!window.confirm("Click OK to reload the original disk and discard any changes.")) {
if (DEBUG) this.println("load cancelled");
return;
}
/*
@ -72484,16 +72497,15 @@ class DebuggerX86 extends Debugger {
var dbgAddrEnd = this.parseAddr(sAddrEnd, true);
if (!dbgAddrEnd || dbgAddrEnd.off < dbgAddr.off) return;
cb = dbgAddrEnd.off - dbgAddr.off;
if (!DEBUG && cb > 0x100) {
/*
* Limiting the amount of disassembled code to 256 bytes in non-DEBUG builds is partly to
* prevent the user from wedging the browser by dumping too many lines, but also a recognition
* that, in non-DEBUG builds, this.println() keeps print output buffer truncated to 8Kb anyway.
*/
this.println("range too large");
return;
}
/*
* We now +1 the count to make the ending address inclusive (just like the dump command).
*/
cb = dbgAddrEnd.off - dbgAddr.off + 1;
if (cb < 0) cb = 1;
/*
* Limiting the amount of disassembled code to 4K helps prevent the user from wedging the browser.
*/
if (cb > 0x1000) cb = 0x1000;
n = -1;
}