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Format of parameter block for function 52h

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Offset Size Description

00h

BYTE

(call) unused???
(ret) 00h if flash/ATA drive but no card inserted unchanged otherwise

Note:

The absense of a flash card should be tested by checking the DOS error code rather than the returned byte.
The parameter byte is cleared to 00h erroneously by the Award PCDISK.EXE v1.02c PCMCIA/ATA driver if no ATA card is inserted (bug corrected in PCDISK.EXE v1.02h and later).
Not supported by the SystemSoft ATADRV.EXE and the Phoenix PCMATA.SYS PCMCIA/ATA drivers.