DD_CHECK_SECTOR

Categories:

• spectrum
• spectrumAPI

Function	Address	Description
DD_CHECK_SECTOR	0169	Check a sector

Synopsys

Check a sector. (Uses the uPD765A scan equal command.)

Checks that the sector on disk is the same as the copy in memory.

Note that FFh (255) on disk or in memory always matches anything (see uPD765A specification for further details).

Entry Parameters

Register	Content
B	Page for 0xC000…0xFFFF
C	Unit 0 or 1
D	Logical track, 0 base
E	logical sector, 0 base
HL	Address of buffer
IX	Address of XDPB

Exit Parameters

If OK & Equal:

Carry true

Zero true

A corrupt

If OK & Not Equal:

Carry true

Zero false

A corrupt

Otherwise:

Carry false

A = Error code

Always:

BC DE HL IX corrupt, all other registers preserved.