Specifications

MICROPROCESSADORES
INTERRUPÇÕES
5
Luís Miguel Charrua Figueiredo 5 - 13 E.N.I.D.H.
SeeAlso: AH=91h,INT 13/AH=00h,INT 17/AH=00h,INT 1A/AH=83h
(Table 00507)
Values for device type:
00h disk
01h diskette
02h keyboard
03h PS/2 pointing device
21h waiting for keyboard input (Phoenix BIOS)
80h network
FBh digital sound (Tandy)
FCh disk reset (PS)
FDh diskette motor start
FEh printer
INT 15 - SYSTEM - GET CONFIGURATION (XT >1986/1/10,AT mdl
3x9,CONV,XT286,PS)
AH = C0h
Return
: CF set if BIOS doesn't support call
CF clear on success
ES:BX -> ROM table (see #00509)
AH = status
00h successful
The PC XT (since 1986/01/10), PC AT (since
1985/06/10), the
PC XT Model 286, the PC Convertible and most PS/2
machines
will clear the CF flag and return the table in ES:BX.
80h unsupported function
The PC and PCjr return AH=80h/CF set
86h unsupported function
The PC XT (1982/11/08), PC Portable, PC AT
(1984/01/10),
or PS/2 prior to Model 30 return AH=86h/CF set
Notes
: the 1986/1/10 XT BIOS returns an incorrect value for the feature byte
the configuration table is at F000h:E6F5h in 100% compatible BIOSes Dell
machines contain the signature "DELL" or "Dell" at absolute FE076h and a model
byte at absolute address FE845h (see #00516) Hewlett-Packard machines contain
the signature "HP" at F000h:00F8h and a product identifier at F000h:00FAh (see
#00519) Compaq machines can be identified by the signature string "COMPAQ" at
F000h:FFEAh, and is preceded by additional information (see #00517) Tandy
1000 machines contain 21h in the byte at F000h:C000h and FFh in the byte at
FFFFh:000Eh; Tandy 1000SL/TL machines only provide the first three data bytes
(model/submodel/revision) in the returned table the ID at F000h:C000h is used by
some Microsoft software before trusting the floppy flags bits 1 and 0 at
0040h:00B5h. the Wang PC contains the signature "WANG" at FC00h:0000h. This
is used by Peter Reilley's portable binary editor and viewer BEAV to detect a
Wang PC. Toshiba laptops contain the signature "TOSHIBA" at FE010h as part of
a laptop information record at F000h:E000h (see #00520) some AST
machines contain the string "COPYRIGHT AST RESEARCH" one byte past the
end of the configuration table the Phoenix 386 BIOS contains a second version
and date string (presumably the last modification for that OEM version) beginning
at F000h:FFD8h, with each byte doubled (so that both ROM chips contain the
complete information)
SeeAlso
: AH=C7h,AH=C9h,AX=D100h,AX=D103h
Format of ROM configuration table:
Offset Size Description (Table 00509)
00h WORD number of bytes following
02h BYTE model (see #00515)
03h BYTE submodel (see #00515)
04h BYTE BIOS revision: 0 for first release, 1 for 2nd, etc.
05h BYTE feature byte 1 (see #00510)
06h BYTE feature byte 2 (see #00511)
07h BYTE feature byte 3 (see #00512)
08h BYTE feature byte 4 (see #00513)
09h BYTE feature byte 5 (see #00514)
??? (08h) (Phoenix 386 v1.10)
??? (0Fh) (Phoenix 486 v1.03 PCI)
---AWARD BIOS---
0Ah N BYTEs AWARD copyright notice
---Phoenix BIOS---
0Ah BYTE ??? (00h)
0Bh BYTE major version
0Ch BYTE minor version (BCD)
0Dh 4 BYTEs ASCIZ string "PTL" (Phoenix Technologies Ltd)
also on Phoenix Cascade BIOS
---Quadram Quad386---
0Ah 17 BYTEs ASCII signature string "Quadram Quad386XT"
---Toshiba (Satellite Pro 435CDS at least)---
0Ah 7 BYTEs signature "TOSHIBA"
11h BYTE ??? (8h)
12h BYTE ??? (E7h) product ID??? (guess)
13h 3 BYTEs "JPN"
Bitfields for feature byte 1:
Bit(s) Description (Table 00510)
7 DMA channel 3 used by hard disk BIOS
6 2nd interrupt controller (8259) installed
5 Real-Time Clock installed
4 INT 15/AH=4Fh called upon INT 09h
3 wait for external event (INT 15/AH=41h) supported
2 extended BIOS area allocated (usually at top of RAM)
1 bus is Micro Channel instead of ISA
0 system has dual bus (Micro Channel + ISA)
SeeAlso
: #00509,#00511
Bitfields for feature byte 2:
Bit(s) Description (Table 00511)
7 32-bit DMA supported
6 INT 16/AH=09h (keyboard functionality) supported (see #00585)
5 INT 15/AH=C6h (get POS data) supported
4 INT 15/AH=C7h (return memory map info) supported
3 INT 15/AH=C8h (en/disable CPU functions) supported
2 non-8042 keyboard controller
1 data streaming supported
0 reserved
SeeAlso
: #00509,#00512,AH=C6h,AH=C7h,AH=C8h,INT 16/AH=09h
Bitfields for feature byte 3:
Bit(s) Description (Table 00512)
7 not used
6-5 reserved
4 POST supports ROM-to-RAM enable/disable
3 SCSI subsystem supported on system board
2 information panel installed
1 IML (Initial Machine Load) system (BIOS loaded from disk)
0 SCSI supported in IML
SeeAlso
: #00509,#00511,#00512
Bitfields for feature byte 4:
Bit(s) Description (Table 00513)
7 IBM "private" (set on N51SX, CL57SX)
6 system has EEPROM
5-3 ABIOS presence
001 not supported
010 supported in ROM
011 supported in RAM (must be loaded)
2 "private"
1 system supports memory split at/above 16M
0 POSTEXT directly supported by POST
SeeAlso
: #00509,#00512,#00514
Bitfields for feature byte 5 (IBM):
Bit(s) Description (Table 00514)
7-5 IBM "private"
4-2 reserved
1 system has enhanced mouse mode
0 flash EPROM
SeeAlso
: #00509,#00513