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A little help with an SX-64 and a 1581.


MaDDuck

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Changing the device number on the internal 1541 is similar to that of the stand-alone 1541. You have to open the case, locate the drive main board and cut of or both jumper traces which indicate device number.

 

I have not been inside an SX-64 for a long time, but I believe the traces which need to be cut are marked.

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The command writes 2 bytes to memory address $0077-0078. It seems $20 (decimal 32) is added for the LISTEN bit and $40 (decimal 64) is added for the TALK bit, per the 1541 disassembly.

If you like to disable head knocking on bad sectors, you can use this:

OPEN 15,8,15:PRINT#15,"M-W";CHR$(106);CHR$(0);CHR$(1);CHR$(113):CLOSE 15
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