Re: IIe I/O error troubleshoot

[Rubywand <rubywand@swbell.net>]

Dakin Williams writes ...
> 
>         I've got an I/O problem with a Disk ][ drive on a IIe.  When the
> Disk ][ controller is in slot 6, a disk with DOS 3.3 will boot enough to
> load DOS, but then gives an I/O Error when it tries to load the hello
> program.  If I try to load another program, it also results in an I/O Error.
> Interestingly, if the same Disk ][ controller card and Disk ][ drive are
> moved to slot 5, programs can be loaded and run without any problem.
> 
>         Is this a malfunction of slot 6?
> 
 ....

     I guess it is a possibility. However, if you can boot DOS 3.3, a problem
with just Slot 6 does not seem especially likely. Perhaps the IIe has a poorly
socketed or damaged Slot select IC for Device Select or I/O Select-- such as a
74LS138 or 74LS154 located near the Slots.

     Something else to check is that you have correctly identified the Slots.
The //e does not have a connector for Slot 0. The Slots are 1-7 going left to
right as viewed from the front of the computer.

     Where did you get the disk you are booting? What does the HELLO program do
(when it runs correctly)?

     Do you have any commercial DOS 3.3 disks or standard util disks you've
downloaded and transferred to your Apple II? If you do, does the same thing
happen when you boot these disks?

     
     Suppose your card is in Slot 5 and you boot a DOS 3.3 diskette. Once the
disk drive is finished spinning and OFF, get to the usual Applesoft BASIC
prompt. (If just quitting the HELLO program doesn't get to the prompt, doing a
Reset usually works.)  Once at the prompt, enter 

PR#5  (type in PR#5 followed by pressing the RETURN key)

What happens?


     Suppose your card is in Slot 5 (same as above) and you boot a DOS 3.3
diskette. Once the disk drive is finished spinning and OFF, get to the usual
Applesoft BASIC prompt. Once at the prompt, enter 

PR#6  (type in PR#6 followed by pressing the RETURN key)

What happens?



Rubywand