Not really, if you have a slow chip/fast CPU just add wait states to the board.
John
From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Jeff Albrecht
Sent: Wednesday, July 15, 2015 9:26 AM
To: n8vem...@googlegroups.com
Cc: norwe...@aol.com
Subject: Re: [N8VEM-S100:7411] Re: V3 Dual IDE/CF S100 Bus board initial checks
On Tuesday, July 14, 2015 at 7:09:18 PM UTC-7, norw...@aol.com wrote:
Hi John,
>> Those IDE boards are in fact a very simple boards.
I agree! On paper, at least. But all the chatter I've seen here w.r.t. the flavor of 8255, mods. to the boards, and subs. for some of the standard LS logic, leads me to believe that they are not all that straightforward.
Debugging the write to the 8255 today. It struck me to check the part number of my 8255. I have a 'P8255' I obained that part number from an older IDE/CF BOM. The BOM for the IDE/CF v.3 specifies a '8255AC-5' is this a deal breaker? Do I specifically need the '8255AC-5' ??
I did check U108 74LS373 has data on pins 2, 5...
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