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2003-05-10 11:47

Testicle
Account closed

Registered: Sep 2002
Posts: 131

file not found-error.

hi,

if i use the simple kernal-load-routine ($ffba/$ffbd to init, $ffd5 to load), and the file is not found, where can i check the error-message, so my program also knows, that the file is not found?

thanks for your help...

2003-05-10 13:50

Graham
Account closed

Registered: Dec 2002
Posts: 990

in the case of errors you have to read the 1541s error channel. to do this you can either use complicated open/input/close calls, or just use this:

LDA $BA ; device number
JSR $FFB4 ; TALK
LDA #$6F ; secondary adress 15
JSR $FF96 ; SECTLK
LDY #$00
STY $90 ; clear status flag
l: JSR $FFA5 ; IECIN
STA store,Y
BIT $90 ; test status flag
BVS e ; bit 6 (EOF flag) set?
INY
BNE l
e: JSR $FFAB ; UNTLK

now you'd need to parse the error string somehow. the format is quite simple: "ee, string,tt,ss<CR>"

ee is the error number where 00 is no error and 73 is the disk drive initialisation message (also no error).

you could also read the error string with some open/input/close combination, but it's far more complicated with that. i always avoid those calls.

2003-05-10 18:30

Testicle
Account closed

Registered: Sep 2002
Posts: 131

works very fine! thanks a lot. :-)

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