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View Full Version : Does XTIDE let you use 720K 3.5" FDD in place of 360K 5.25" FDD on XTs?



lameboyadvance
May 21st, 2017, 04:41 AM
I'm planning on getting XTIDE for my PC1640. By default all it knows is 360K 5.25" floppies. You can get it using 720K 3.5" as drive B by using DRIVPARM/DRIVER.SYS, but the boot drive is stuck as 5.25".
I've been playing around with the Amstrad PC1512/PC1640 emulation in PCem (which uses the XTIDE BIOS), and it lets you set and boot from 720K 3.5" FDDs. Is this an upgrade done by PCem, or will XTIDE actually let me boot from 720K on a XT that normally only knows 360K?

Malc
May 21st, 2017, 05:37 AM
With the XTIDE Universal Bios you can boot from either the A or B floppy drive, So if you fitted a 1.44Mb 3.5" floppy drive to replace the B drive in your Amstrad PC1640 the XUB will allow you to boot from the B drive. I no longer own a PC1640 so can't try it.

lameboyadvance
May 21st, 2017, 07:12 AM
I know you can boot from either drive, I was wondering if XTIDE let you boot from 720K disks even if the XT its running on only knows about 360K ones.

1ST1
May 21st, 2017, 07:16 AM
XTIDE has nothing to do with floppy support. EXCEPT MAYBE, never tryed, if it would have Super-Floppy support for LS-120 IDE floppy.

You can use 3,5 inch 720 floppy on any XT using MS-DOS. You only have read about the driveparm command which you can put in config.sys. diveparm command is supported with MS-DOS 3.x and newer, maybe even with DOS 2.x. With driveparm you can tell your PC that the drive it knows is not 360 kb, but 720. 1.44 MB HD drive is not possible with XT floppy controller. Alternatively you also can use the device=driver.sys. With driver.sys you also tell your PC that an attached drive is 720 kb. The difference is, that when accessing a: or b: it uses still the parametes brought by BIOS. Bit driver.sys will add another drive letter to the same drive with the new parameters.

For exact syntax of driveparm and driver.sys refer to some online documentation.

Malc
May 21st, 2017, 08:00 AM
I know you can boot from either drive, I was wondering if XTIDE let you boot from 720K disks even if the XT its running on only knows about 360K ones.

Oh i see now, On my IBM XT 5160 with original low density floppy controller i fitted a 1.44Mb 3.5" floppy drive and can boot from 720k floppy disks no problem, The XUB has nowt to do with that it just allows booting from either floppy. More info on that [ Here (http://www.minuszerodegrees.net/5160/floppy_diskette/5160_floppy_drive_support.htm) ]. Also On my XT i use a utility called " SetDrive " so i can format the floppy at 720k.

EDIT: According to this website (http://www.seasip.info/AmstradXT/hwcompat2.html) the B drive on the PC1640 can be replaced with a 1.44Mb 3.5" floppy drive and work with 720K floppy disks.