[Coco] Re: [Color Computer] Floppy contoler Q

[Gene Heskett]

On Sunday 15 January 2006 01:48, Paul T. Barton wrote:
>Yup, 25-3xx9
>
>MB8877  - (? - earlier design?)
>MB8877A - (works for 2HD drives)

Humm, are you saying that this one even works for 1 megabaud data rates?  
Which would be putting 2.88 megs on an HD floppy?  Or 2.4 megs on an HD 
5.25" disk turning at 360 rpm?

Interesting possibilities there.  I did have a controller with that chip 
in it at one time, a Hard Drives International in a black alu case 
IIRC.  I'll have to get that puppy out if I can find it & dig around in 
it.

Has anyone a schematic of that controller perchance?

>MB8876A - (inverted data bus)
>
>All commands in Disk Basic work great!
>And it's +5v only, no +12v needed.
>
>> Interesting.  Have you looked at the Fujitsu MB8877.
>> Its supposed to be a cmos workalike to the 1793 from
>> what I've read but that was years ago.  It was used
>> in at least one coco controller, maybe two.
>
>Paul - idezilla
>
>
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