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Int 21 Fn 2535 P - Phar Lap 386/dos-extender V3.0+ - Read/write System R [E]
AX = 2535h
EBX = direction (00h read registers, 01h write)
DS:EDX -> system register record (see below)
Return: CF clear
Note: this call is only available under MS Windows if PHARLAP.386 VDD is
installed
Format of system register record:
Offset Size Description
00h DWORD CR0
04h 4 DWORDs DR0,DR1,DR2,DR3
14h 2 DWORDs reserved
1Ch 2 DWORDs DR6,DR7
24h 3 DWORDs reserved
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