TITLE   'SPEED - Adjust Diskette Parameters'
; Adapted from SPEED411 and from "Inside the IBM PC",
; by Peter Norton, pages 138-139.
;
; At location x'78' is a pointer to the diskette
; parameter table. This program changes the first
; value, the Step Rate Time, which results in a
; quieter and somewhat faster running drive.
;
; The third byte of the table specifies the motor
; turn off delay time. It is changed from 37 msec
; to 200 msec, which results in fewer start-up
; operations.
;
; To install:
;     MASM SPEED;
;     LINK SPEED;
;     EXE2BIN SPEED.EXE SPEED.COM
;     DEL SPEED.EXE
;     SPEED
; The program can be run again without harm.
;
CSEG     SEGMENT PARA PUBLIC 'CODE'
         ASSUME  CS:CSEG,DS:CSEG,ES:CSEG
         ORG     100H
SPEED    PROC    FAR
         PUSH    DS                      ;save for linkage
         XOR     AX,AX                   ;clear for return
         PUSH    AX                      ;put in stack
;
         PUSH    DS                      ;Modify diskette parameters
         MOV     DS,AX                   ;Offset into disk table
         LDS     DI,DWORD PTR DS:78H     ;Addr of disk table
         MOV     BYTE PTR [DI],239       ;Modify step rate
         MOV     BYTE PTR [DI+2],200     ;And motor stop delay
         INT     13H                     ;Reset diskette system
         POP     DS
;
         INT     20H
;
SPEED    ENDP
CSEG     ENDS
         END     SPEED
e sent to disk, screen, printer, or
 any other device)