MEM 0040h:00B5h - Tandy BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. DATA FLAGS
Size: BYTE
SeeAlso: MEM F000h:C000h
Bitfields for Tandy BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. data flags:
Bit(s) Description (Table M0131)
0 set if drive A: is 720 Kb
1 set if drive B: is 720 Kb
2-7 unknown
Note: Before checking these bits, the Tandy ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs. BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. ID byte at F000h:C000h
should be verified to be equal to 21h.
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MEM 0040h:00E5h - Gigabyte AWARD v4.51PG - ASSOC DRIVE NUMS TO PHYS INTERFACES
Size: BYTE
SeeAlso: MEM 0040h:00E5h"AWARD"
Bitfields for drive number/interface mapping:
Bit(s) Description (Table M0129)
7-6 interface for drive 83h (F:)
00 primary master
01 primary slave
10 secondary master
11 secondary slave
5-4 interface for drive 82h (as for bits 7-6)
3-2 interface for drive 81h (as for bits 7-6)
1-0 interface for drive 80h (C:) (as for bits 7-6)
SeeAlso: #M0128