From: Baltissen, GJPAA (Ruud) (ruud.baltissen_at_abp.nl)
Date: 2004-07-05 16:23:19
Hallo allemaal, For the ???th year in a row I'm still working on my, let's say, 64HDD version for the PET/CBM. In general things work fine. But a big troubleshooter was, and still is, the handling of the DIRECTORY command. For those who forgot: this is the BASIC V4 version of 'LOAD "$",8' with two major differences: - the output from the drive is sent to screen, not saved as a BASIC file - the transfer is interrupted everey one or two bytes by te CBM for one or another reason Most of the transfer is not time critical. The only time critical is that you HAVE to start sending data within ??? uSecs after receiving TALK otherwise the computer responds with "FILE NOT FOUND". This time critical thing also applies to the time between bytes. The actual transfer of the bytes is done using handshaking, not time sensitive clocking as with the IEC-protocol. The stupid thing is that, just because of time sensitivity described above, everything I have to sent is placed in RAM so during a transfer IMHO most of the time the program is waiting for the handshake signals and checking ATN in between. And yet sometimes the CBM responds with a "DEVICE NOT PRESEN?" which means the PC hasn't noticed a ATN for some reason. The only thing I can think of is that a PC-interrupt consumes to much precious time. So I'm thinking of shutting down some interrupts in one or another way. Who has experience (I'm especially thinking of Nick and Andre) and can give me some usefull tips ? Many thanks IA !!! -- ___ / __|__ / / |_/ Groetjes, Ruud \ \__|_\ \___| URL: Ruud.C64.org =====DISCLAIMER================================================================= De informatie in dit e-mailbericht is vertrouwelijk en uitsluitend bestemd voor de geadresseerde. Wanneer u dit bericht per abuis ontvangt, verzoeken wij u contact op te nemen met de afzender per kerende e-mail. Verder verzoeken wij u in dat geval dit e-mailbericht te vernietigen en de inhoud ervan aan niemand openbaar te maken. Wij aanvaarden geen aansprakelijkheid voor onjuiste, onvolledige dan wel ontijdige overbrenging van de inhoud van een verzonden e-mailbericht, noch voor daarbij overgebrachte virussen. The information contained in this e-mail is confidential and may be privileged. It may be read, copied and used only by the intended recipient. If you have received it in error, please contact the sender immediately by return e-mail; please delete in this case the e-mail and do not disclose its contents to any person. We don't accept liability for any errors, omissions, delays of receipt or viruses in the contents of this message which arise as a result of e-mail transmission. Message was sent through the cbm-hackers mailing list
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