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25 lines
768 B
Plaintext
25 lines
768 B
Plaintext
; ffhaslu.lib 1/22/2012 dwg - macro to detect drive with logical unit support
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ffhaslu macro
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local ret$false,fini
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mvi c,RETCURR
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call BDOS
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mov c,a
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call BISELDSK
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lxi d,16 ; offset to end of DPH
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dad d ; calc offset of 1st signature byte
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mov a,m ; pick up first sig byte which s/b 'L'
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cpi 'L'
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jnz ret$false ; if it wasn't, indicate to caller no LU
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inx h ; bump ptr to 2nd signature byte
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mov a,m ; pick up second sig byte which s/b 'U'
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cpi 'U'
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jnz ret$false ; if it wasn't, indicate to caller no LU
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mvi a,TRUE ; otherwise indicate presence of LU support
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jmp fini ; finish up macro
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ret$false:
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mvi a,FALSE ; prepare negative response for caller
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fini:
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endm
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