User`s manual

DIGITAL-LOGIC AG MSLB-P5 Manual V0.3
PRELIMINARY 181
Continued
AH = C0h Return system parameters
Exit:
ES:BX Pointer to System Configuration Bytes 1-2Length of table
in bytes (8)
Byte 3 Model (FCh = AT Byte 4 Sub
model (01h = AT)
Byte 5 BIOS revision level (0)
Byte 6 Feature information:
Bit 0 0 = Reserved
Bit 1 0 = ISA-type I/O channel
Bit 2 0 = EDBA not allocated
Bit 3 0 = Wait for external event
supported
Bit 4 1 = Keyboard intercept
(INT 154F) called by INT 09h
Bit 5 1 = Real time clock present
Bit 6 1 = Second PIC present
Bit 7 0 = Fixed disk BIOS does not
use DMA channel 3
Byte 7 Reserved
Byte 8 Reserved
AH = C1h Return Extended BIOS Data Area Address
Exit:
ES Extended BIOS Data Area Segment Address
If Carry = 1
AH 86 = Invalid BIOS routine call (No EBDA)
16.6.11 Interrupt 15h–APM Services
The INT 15 software interrupt optionally handles the calls supporting APM (Advanced Power Man-
agement).
The following are the APM exit status codes:
APM Service Exit Status Codes
AH 00h = No error
If Carry = 1:
AH 01h = Power Management disabled
02h = Real Mode interface already connected
03h = Interface not connected
05h = 16-bit protected mode interface already
connected
06h = 16-bit protected mode interface not
supported
07h = 32-bit protected mode interface already
connected
08h = 32-bit protected mode interface not
supported
09h = Unrecognized Device ID
0Ah = Parameter value out of range
0Bh = Interface not engaged
60h = Unable to enter requested state
80h = No PM events pending
86h = No APM present