From: Christian Johansson (c64_at_comhem.se)
Date: 2004-02-08 13:42:51
----- Original Message ----- From: "William Levak" <firstname.lastname@example.org> To: <email@example.com> Sent: Sunday, February 08, 2004 1:30 AM Subject: Re: Not possible to send two disk drive commands after each other > On Sat, 7 Feb 2004, Christian Johansson wrote: > > > Hi! > > > > I just noticed that if I in assembly first send one disk drive command to > > the disk drive, e.g. "U1 3 0 1 0" and I then immediately after the carriage > > return send another disk drive command such as "B-P 3 0", both commands > > fail. The drive light starts to flash and if I read out the error channel it > > says "30 SYNTAX ERROR". If I just send one of the disk drive commands it > > works well. Why is this? Must there be a pause between the commands for it > > to work or do I perhaps have to call UNLSN followed by LISTN between the > > commands or do something else to get it to work? (For my application I found > > that the B-P command was superfluous so I could just leave it out but I > > would still like to know how to do.) > > I have noticed that even in BASIC, some commands require that you read the > error channel afterword, or the next command is not executed correctly. I > don't remember which ones, at the moment. > In BASIC, I can send the two commands directly after each other without reading the error channel without any problems. /Christian Message was sent through the cbm-hackers mailing list
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