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bluejay

CoCo 2 Cassette Problems

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This is one of the problems I couldn't resolve with my CoCo 2. Mine came with a CCR-81, and it doesn't seem to load or save programs, and whenever I try to load a saved game in Dungeons of Daggorath, it reboots the computer. It doesn't seem to have problems reading or writing music on cassettes. I don't think it's the cassette's problem, since I've been recording music on the Radio Shack tape it came with. When loading in BASIC, it prints "IO ERROR". I've fiddled with the volume knob a billion times, and nothing changes. I'm getting reallt sick of having to start from the beginning whenever I die in DoD. Help please!!!

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How old is the cassette recorder? It might be that there are belts that need replacing, or the heads need to be realigned, etc

 

Have you tried loading from your phone or computer using a .wav file from the Color Computer Archive?

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My cassette is the Tandy CCR-81, sold by Radio Shack from back in the early 80s for TRS-80 computers. .wavs didn't work well either. I got an IO error or a jumbled screen, or the system would just crash. The heads spin fine, and music plays/records fine too.

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Unfortunately, no. This was my first CoCo, and all the stuff came with it, and when you thjnk about it, there isn't a reason to keep an extra cassette cable.

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Hm, you know, I have a CoCo 1 that really struggles to read cassettes that my CoCo 2 has no problem with. I wonder what chip is largely in control of the cassette stuff? Maybe that needs to be replaced?

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18 hours ago, Nateo said:

 I wonder what chip is largely in control of the cassette stuff? Maybe that needs to be replaced?

 

The Peripheral Interface Adapter (PIA) is the 6821 (or maybe the 6820); there should be two of them. If one of those chips has has failed, the joystick and/or keyboard would also not work.

 

There is also a mechanical relay to turn on/off the cassette motor. It makes an audible sound when it trips, so it is easy to determine if it is working.

 

 

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My joysticks and keyboard works fine, and the "tick" sound must be the relay. So it must be the cable's fault?

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If you have a multimeter (or a similar tool), you can check the continuity of the cable -- making certain that each pin is connected to the appropriate tip.  It is essentially just a piece of wire, so there is not much to test.

 

The Technical Reference Manual should have the details of the cassette cable. See also page 45 for some information on testing/diagnosing the cassette interface.

 

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On 12/5/2019 at 9:49 AM, bluejay said:

My joysticks and keyboard works fine, and the "tick" sound must be the relay. So it must be the cable's fault?

 

Or belts, dirty head, magnetized head, capacitors, placed too close to a monitor or some other source of RFI in the room, old cassettes that are no good, trying to save data on cheap cassettes or metal cassettes.

 

Unless your brain and ears are attuned frequencies streaming at 1500 baud, being able to listen to music on it means nothing.

I replaced the belts and all capacitors in my CTR-80 to make it reliable again.

 

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On November 28, 2019 at 8:51 PM, bluejay said:

This is one of the problems I couldn't resolve with my CoCo 2. Mine came with a CCR-81, and it doesn't seem to load or save programs, and whenever I try to load a saved game in Dungeons of Daggorath, it reboots the computer. It doesn't seem to have problems reading or writing music on cassettes. I don't think it's the cassette's problem, since I've been recording music on the Radio Shack tape it came with. When loading in BASIC, it prints "IO ERROR". I've fiddled with the volume knob a billion times, and nothing changes. I'm getting reallt sick of having to start from the beginning whenever I die in DoD. Help please!!!

Inn the old days the trick with the coco cassette player was to lay it upside down (bottom up). Not sure why but it works

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The cassette recorder and cable works just fine on my Model 100.

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