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Zibri
Account closed
Registered: May 2020
Posts: 304 |
How to receive a byte in 1541 drivecode?
Imagine this situation:
C64 SIDE:
open 15,8,15,"u3"
print#15,"ABCDE" : rem ANY LENGTH...
print#15,"X"
get#15,S$
close15
1541 side:
I don't understand how can I:
read a byte from IEC, wait for "X" and then send back a string.
Everything I tried failed.. I am missing something.
Can anyone help? |
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Krill
Registered: Apr 2002
Posts: 2825 |
Quoting Krillyou can deep-copy and modify the relevant bits at http://unusedino.de/ec64/technical/aay/c1541/ro41e85b.htm Quoting ZibriClearly nobody knows the answer to my question. Quoting Krillyou can deep-copy and modify the relevant bits at http://unusedino.de/ec64/technical/aay/c1541/ro41e85b.htm Quoting ZibriYep.. exactly.. that's what I meant.
For now I don't have a good result.
Hence my question. Pretty sure what i said IS an answer. Doing the actual gruntwork of reimplementing the protocol (and also make the code just snoop, not actually talk on the bus, which is a different beast) is left to the reader as an exercise. |
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Martin Piper
Registered: Nov 2007
Posts: 631 |
I did a cartridge version of Summer Games that intercepted the kernal routines some returned the expected error. :) |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Quote: I did a cartridge version of Summer Games that intercepted the kernal routines some returned the expected error. :)
Yep.. I do that often, but no, I was searching for a different thing. If nobody did it until now, the better... I will do it. |
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Zibri
Account closed
Registered: May 2020
Posts: 304 |
Quoting KrillDoing the actual gruntwork of reimplementing the protocol (and also make the code just snoop, not actually talk on the bus, which is a different beast) is left to the reader as an exercise.
Yeah.. sure... that's why I asked. If I were able I would not have asked. But anyway.. ok... nobody clearly did it until now.
I'll see what I come up with. |
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tlr
Registered: Sep 2003
Posts: 1703 |
If you are writing a passive analyzer it could be made to run on a second c64 connected to the same bus iec-bus. |
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chatGPZ
Registered: Dec 2001
Posts: 11101 |
I'd just clip the logic analyzer on the bus and then decode the capture, much easier :) |
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Krill
Registered: Apr 2002
Posts: 2825 |
Quoting GroepazI'd just clip the logic analyzer on the bus and then decode the capture, much easier :) Doing whatever with early 1980s stock hardware does have its charm, though. :) |
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Krill
Registered: Apr 2002
Posts: 2825 |
Quoting tlrIf you are writing a passive analyzer it could be made to run on a second c64 connected to the same bus iec-bus. Maybe, but the C-64's inability to read the state of the ATN line could be a problem. |
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tlr
Registered: Sep 2003
Posts: 1703 |
Quote: Quoting tlrIf you are writing a passive analyzer it could be made to run on a second c64 connected to the same bus iec-bus. Maybe, but the C-64's inability to read the state of the ATN line could be a problem.
Good point. Maybe a userport connection instead? A few resistors could be added to minimize the loading and perhaps also sampling $dd01 using a REU. |
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Krill
Registered: Apr 2002
Posts: 2825 |
Quoting tlrGood point. Maybe a userport connection instead? A few resistors could be added to minimize the loading and perhaps also sampling $dd01 using a REU. Yes, either user port or joystick port(s). The latter could also sample real analogue values, perhaps, for a true stock hardware (except the adaptor) homebrew oscilloscope. Not sure how sensible that is, of course. =) |
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