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Re: [N8VEM-S100:3631] Re: Run of Dual CF-Card/Hard Disk IDE S-100 Boards
- To: firstname.lastname@example.org
- Subject: Re: [N8VEM-S100:3631] Re: Run of Dual CF-Card/Hard Disk IDE S-100 Boards
- From: Gary Kaufman <geka...@gmail.com>
- Date: Sun, 11 May 2014 16:17:17 -0400
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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??
On 5/11/2014 3:43 PM, David Fry wrote:
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.