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Issue a warning if the specified disk's geometry doesn't match the drive type passed to the HDC

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This commit is contained in:
Jeff Parsons 2015-12-05 12:23:29 -08:00
commit 3ee1a6148b
1 changed files with 18 additions and 3 deletions
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21
modules/pcjs/lib/hdc.js
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@ -148,11 +148,16 @@ HDC.DEFAULT_DRIVE_NAME = "Hard Drive";
* Also, I capitalize only the first letter of units like Kb and Mb, because kilobyte and megabyte are
* single words; if they were two words, or even a pair of hyphenated words, then I might -- but they're not.
*/
/*
* Drive type tables differed across IBM controller models (XTC drive types don't match ATC drive types)
* and across OEMs (eg, Compaq drive types only match a few IBM drive types), so you must use iDriveTable to
* index the correct table type inside both aDriveTables and aDriveTypes.
*/
HDC.aDriveTables = ["XTC", "ATC", "COMPAQ"];
HDC.aDriveTypes = [
/*
* Sadly, drive types differ across controller models (XTC drive types don't match ATC drive types),
* so aDriveTypes must first be indexed by a controller index (this.iDriveTable).
*
* aDriveTypes[0] is for the IBM PC XT (XTC) controller.
*/
{
@ -1261,6 +1266,16 @@ HDC.prototype.doneLoadDisk = function(drive, disk, sDiskName, sDiskPath)
* and is not guaranteed to match the drive mapping that DOS ultimately uses.
*/
this.notice("Mounted disk \"" + sDiskName + "\" in drive " + String.fromCharCode(0x43 + drive.iDrive), drive.fAutoMount);
var aDiskInfo = disk.info();
if (aDiskInfo[0] != drive.nCylinders || aDiskInfo[1] != drive.nHeads || aDiskInfo[2] != drive.nSectors || aDiskInfo[3] != drive.cbSector) {
/*
* TODO: Decide how to deal with this problem; ie, either disallow disk access altogether, or automatically
* map the controller's I/O requests to the disk's geometry. Also, we should provide a way to reformat such a
* disk so that its geometry matches the controller requirements.
*/
this.notice("Warning: disk geometry (" + aDiskInfo[0] + ':' + aDiskInfo[1] + ':' + aDiskInfo[2] + ") does not match " + HDC.aDriveTables[this.iDriveTable] + " drive type " + drive.type + " (" + drive.nCylinders + ':' + drive.nHeads + ':' + drive.nSectors + ")");
}
}
if (drive.fAutoMount) {
drive.fAutoMount = false;