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- External 3.5" Diskette Driver version 1.01 Release Notes
-
-
- The following changes have been made since version 1.00:
-
- An attempt is now made to use INT 15 function 86 to time the diskette speedup.
- This allows reasonably accurate timing independent of the speed of the hardware
- upon which the driver is installed. This use of INT 15 enables option WAITHLT
- (halt while waiting for motor spinup and interrupts and use the timer tick for
- timing) to be set FALSE (it had previously been set TRUE for the same reason of
- CPU-speed-independent timing). In addition, a bug with WAITHLT set to TRUE in
- the wait-for-diskette-interrupt which could cause a false timeout error to be
- returned has been corrected.
-
- The clock-speed equate CLK10, as before used only for gross timeouts, has been
- lengthened because this program can potentially be run on very fast AT clones.
-
- Because of a possible conflict in handling the diskette motor timeout count at
- 40:3F between this driver and an IBM system-board BIOS driver, the "reset"
- function (function 00) is never revectored. An option to revector it (THFUNC0)
- is set FALSE; if TRUE, the timeout count is saved before revectoring and
- restored after revectoring.