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New ChipSet parameter ('floppies') used to specify number and capacity of installed floppy drives

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This commit is contained in:
Jeff Parsons 2014-10-24 14:42:17 -07:00 • committed by jeffpar
commit ae6dc3bd12
122 changed files with 923 additions and 853 deletions
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41
my_modules/pcjs-client/lib/fdc.js
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@ -742,19 +742,34 @@ FDC.prototype.initController = function(data)
var drive = this.aDrives[iDrive];
if (drive === undefined) {
/*
* The first time each drive is initialized, obtain its type (from switches or CMOS) and the physical limits
* of the drive (ie, max tracks and max sectors/track). As for max heads, initDrive() assumes that all drives
* have two heads, and in any case, there's no way to configure/specify a single-sided floppy drive.
*
* TODO: Provide a configuration option for single-sided drives, in case someone really wants to simulate that.
* The first time each drive is initialized, we query its capacity (based on switches or CMOS) and set
* the drive's physical limits accordingly (ie, max tracks, max heads, and max sectors/track).
*/
drive = this.aDrives[iDrive] = {};
drive.bType = this.chipset.getSWFloppyDriveType(iDrive);
drive.nCylinders = 40;
drive.nSectors = 9;
if (drive.bType == ChipSet.CMOS.FDRIVE.DSHD) {
var nKb = (this.chipset? this.chipset.getSWFloppyDriveSize(iDrive) : 0);
switch(nKb) {
case 160:
case 180:
drive.nHeads = 1; // required for single-sided drives only (all others default to double-sided)
/* falls through */
case 320:
case 360:
default: // drives that don't have a recognized capacity default to 360
drive.nCylinders = 40;
drive.nSectors = 9; // drives capable of writing 8 sectors/track can also write 9 sectors/track
break;
case 720:
drive.nCylinders = 80;
drive.nSectors = 18; // 15 for 1.2Mb diskettes, 18 for 1.44Mb diskettes, 8/9 for everything else
drive.nSectors = 9;
break;
case 1200:
drive.nCylinders = 80;
drive.nSectors = 15;
break;
case 1440:
drive.nCylinders = 80;
drive.nSectors = 18;
break;
}
}
if (!this.initDrive(drive, iDrive, dataDrives[iDrive])) {
@ -1194,8 +1209,8 @@ FDC.prototype.mountDiskette = function(drive, disk, sDisketteName, sDiskettePath
if (disk) {
/*
* We shouldn't mount the diskette unless the drive is able to handle it; for example, DSDD (40-track)
* drives cannot read DSHD (80-track) diskettes. However, I no longer require that the diskette's
* We shouldn't mount the diskette unless the drive is able to handle it; for example, FD360 (40-track)
* drives cannot read FD1200 (80-track) diskettes. However, I no longer require that the diskette's
* sectors/track fall within the drive's standard maximum, because XDF diskettes use 19 physical sectors/track
* on the first cylinder (1 more than the typical 18 sectors/track found on 1.44Mb diskettes) but declare
* a larger logical size (23 512-byte sectors/track) to reflect the actual capacity of XDF tracks beyond the
@ -1459,7 +1474,7 @@ FDC.prototype.outFDCOutput = function(port, bOut, addrFrom)
* MODEL_5170 boot code. Here's why:
*
* Unlike previous models, the MODEL_5170 BIOS probes all installed diskette drives to determine drive type;
* ie, DSDD (40-track) or DSHD (80-track). So if there are two drives, the last selected drive will be drive 1.
* ie, FD360 (40-track) or FD1200 (80-track). So if there are two drives, the last selected drive will be drive 1.
* Immediately before booting, the BIOS issues an INT 0x13/AH=0 reset, which writes regOutput two times: first
* with FDC.REG_OUTPUT.ENABLE clear, and then with it set. However, both times, it ALSO loads the last selected
* drive number into regOutput's "drive select" bits.