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When you run the echo test and hold down a key to send a stream of characters, does it echo correctly or does it garble or miss characters? If you're using TerraTerm to send the paper tape image, try setting an inter-character delay. I don't remember if HyperTerm lets you do that too. When the Altair is running the loader waiting for you to send the tape, the address and status lights should show a steady, unchanging pattern. Then when you start sending the tape, the lights should change to a different pattern and flicker slightly, though it may be pretty subtle. If the lights never change from their original pattern, my guess would be that the 2SIO is not receiving a full 8 bit data stream. If the lights do change then the loader found the start token, if it has trouble after that it will generally print some sort of error code. What loader are you using and what are you trying to load? Quote:
Geoff. |
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