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Re: [N8VEM-S100:3631] Re: Run of Dual CF-Card/Hard Disk IDE S-100 Boards

Hi Gary,
Having slept on this, the most logical thought is that the program call to your routine to switch back to drive 'A' is not taking place.
Here are a few ideas to look at, Please can you zip up the complete program code and attach it to your reply to see if I can help further.
Try inserting a console out command in the Drive 'A' switch routine to send a few characters to the screen to see if the routing is being called, if you are using a jump table check the labels match up, is the keycode you are using in the jump table being screened out by some character validation ?????
David Fry
On Sunday, May 11, 2014 9:17:17 PM UTC+1, Gary Kaufman wrote:
David -

The "power up" default seems to be Drive "A".  If I run the MYIDE
(single drive version) I can access/format/read/write drive "A".

If I use the rom monitor to switch to Drive "B", then run the MYIDE
(single drive version) I can access/format/read/write drive "B".

If I use the drive select code I sent along I can switch from "A" to
"B", but not back again.  If I then "Break" back to the monitor I can
output 00H to 34H, reselecting "A" without any problem and it will work
fine with MYIDE as drive "A".

Why I can change "A" to "B" with the software, but not "B" to "A" is
confusing.  Why it works fine in the monitor is even more strange.

I'm wondering if the ADC SuperSix doesn't completely decode I/O
addresses, or maps things differently when the ROM is enabled??

- Gary

On 5/11/2014 3:43 PM, David Fry wrote:
> Hi Gary,
> Just to clarify, You saying that once Drive 'B' is selected you are
> unable under the software to switch back to Drive 'A'.
> Do you mean you are unable to read the Drive 'A' CF card after
> switching back to Drive 'A' or does the drive select LED not change
> from 'B' to 'A' ?
> Afterall the drive select mechanism is just a D type flip flop mapped
> to a port !!
> I cant see anything leaping out at me from your code snippet.
> Regards
> David Fry