SECTION 6
Conversions and Interfaces
6-74 PEN*KEY
R
6200/6300 Hand-Held Computer Programmer’s Reference Guide
INT 15h, Function AX = 01FFh: Compute CRC 16 on Block of Data
4000API
This system service may not be PC compatible.
Generator polynomial is CRCć16 = X**16 + X**15 + X**2 + X.
On Entry:
AH = 01h
AL = 0FFh
DS:SI = Points at the data block
CX = Contains the block length in bytes
On Return:
DS:SI = Points past the end of the block
CX = 0000h
AX = CRC
INT 15h, Function AX = 4200h: Request System Shutdown, Normal
4000API
This interrupt is a PC-like system service.
Has ON/OFF key wake unit. Puts processor to sleep (save power). BIOSĆissued
when system idles. Turns off display.
On Entry:
AH = 42h
AL = 00h
On Return:
None
INT 15h, Function AX = 4201h: Request System Shutdown, Low Battery
4000API
BIOSĆissued during critical power failure. PCĆlike system service.
On Entry:
AH = 42h
AL = 01h
On Return:
None
"
NOTE:
Do NOT allow ON/OFF key to wake unit. Force display off. Turn off all peripherals.
6. Conversions and
Interfaces
