[Coco] SuperIDE and floppy disk

[Mark Marlette]

sIDE to slot one.



________________________________
 From: Retro Canada <retrocanada76 at gmail.com>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com> 
Cc: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com> 
Sent: Thursday, May 9, 2013 8:30 PM
Subject: Re: [Coco] SuperIDE and floppy disk
 

removing the sc/c from slot1 seems to be fine now. manual says it must be inserted on slots 2-3 only. what could be used on slot1? rs232?

Sent from my iPhone

On 2013-05-09, at 7:28 PM, Darren A <mechacoco at gmail.com> wrote:

> On Thu, May 9, 2013 at 4:27 PM, Gene Heskett wrote:
>> On Thursday 09 May 2013 13:02:06 Luis Antoniosi (CoCoDemus) did opine:
>> 
>>> well this is what is written on cloud-9 site:
>>> 
>>> http://www.frontiernet.net/~mmarlette/Cloud-9/Hardware/MPI%20PAL.html
>> Mark, can you explain the theory on this? $FF90 is a (write only?) GIME
>> address.  Ahh read is going to return $FF because its write only, which is
>> precisely the reason in Nitros9 that the DP=00, offset $90-9F is an image
>> of what is in the GIME.
> 
> An MPI without the CoCo3 mod will activate its data bus buffer outputs
> when the CoCo reads from addresses between FF80 and FFBF.  The
> modification eliminates that range of addresses from the "readable
> hardware" space.  Apparently the buffers in the MPI output a '1' when
> nothing is driving the input, and so you get 255 for a PEEK of the
> write-only location. With the mod in place, the buffers remain
> tri-stated (Z) and you get the usual stale data value of 126.
> 
> Darren
> 
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