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== 3.5" READY Signal Test ==
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(my very favourite testing stage for 3.5” disc drives)<BR>
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:1. First of all, make sure that 3.5" external disc drive B is connected to the back of "Disc Drive" connector (located on the back of keyboard), and switched on. Then power up the computer by switching the monitor on and the keyboard on as well, the 3" and 3.5" drive lights up, ready for 2 disc drive operation.
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:2. Put CP/M Plus disc (Side 1 of CPC system discs) on Drive A and no disc in drive B (3.5” disc drive). Type |CPM, then press ENTER.
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:3. Now it starts booting CP/M Plus. Make sure that you see this message “2 disc drives” on the screen during CP/M Plus start-up
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::A. If you see this message (as shown above) on the screen with CP/M Plus disc on Drive A (3”) and no disc on drive B (3.5”), this means that your 3.5” external disc drive has a READY signal. EXCELLENT!!!
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::B. If you see this message instead "1 disc drive" on the screen, then it means that your 3.5" disc drive doesn't have a READY signal. That is very inconvenient because you have to put a disc in Drive B as well every time when you boot CP/M Plus to use both disc drives (e.g. using DISCKIT or PIP to copy discs), but its good for CPC 664 (a useless computer), as it can't run CP/M Plus, it'll run CP/M 2.2 instead.
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:4. Switch everything off. Now you know the easy way how to check the 3.5" disc drive to see it has READY signal or NOT!!!