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GideonZ / 1541ultimate

Official GIT archive of 1541 ultimate II sources
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U64 - Multi-part demo not loading #129

Open Marc91360 opened 4 years ago

Marc91360 commented 4 years ago

U64 Elite V1.26 - 3.6a.

"a press space odyssey" demo does not work as expected. The first part (loader) loads, but the following parts do not flow - no loading. Tested on an emulator, works without problems. Attached the demo, if necessary.

apso-1.zip

Best regards

marty41 commented 4 years ago

Working fine here on a Ultimate 1.2, Ultimate 1.3e and Ultimate 1.4e, all with fw 1.26. Even with Dolphin Dos 2 kernal and drive ROM activated the mentioned demo does work fine and without any issues at all! Seem you have something enabled/activated in your U64 config, that prevents the demo from working. No bug at all I would say.

Marc91360 commented 4 years ago

Thanks for these informations ! So I looked at the options activated on my U64, and I found that drive B was activated. So I disabled it, and I now make the same conclusions as you: The demo works perfectly.

We can therefore assume that it is the Demo which does not really appreciate multiple readers, and that U64 is out of the question?

marty41 commented 4 years ago

Most demos use speed loader that will not accept any other device on the IEC bus, as they IMHO use the ATN line for data. Some have a detection for other drives on the bus and will tell you to unplug them and other just do not work. :/

GideonZ commented 4 years ago

It may be an interesting feature if the external bus can be 'disconnected' in software. This is probably not too difficult to achieve, if I just add a logic switch in the FPGA that can be controlled from the configuration menu. :-)

On Tue, Feb 11, 2020 at 9:31 PM marty RADWAR notifications@github.com wrote:

Most demos use speed loader that will not accept any other device on the IEC bus, as they IMHO use the ATN line for data. Some have a detection for other drives on the bus and will tell you to unplug them and other just do not work. :/

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