[fdutils] Need help with weird floppy issue

David C Niemi niemi at tuxers.net
Tue Mar 7 18:10:01 CET 2006

The MB89311AP is apparently an obsolete 8-bit CMOS microcontroller by 
Fujitsu.  What is the vintage of this machine?  1987-8?  There are 
generally date codes with YYWW (e.g. 8704 for the 4th week of 1987), they 
should be present on most of the ICs.

The MB4107 is another Fujitsu chip, unknown function.  There would have 
been floppy controller chips in use at that time, and they probably would 
have used one, unless they were trying to save a buck or two and do it all 
in software (ick).


On Tue, 7 Mar 2006, Donnie Barnes wrote:
> Small update.  The System24 floppy controller board has an 8Mhz crystal 
> and 8 chips.  Six of the chips are TTL stuff (74LS367 x2, 74LS05 x2, 
> 74LS174, and 74LS139).  The other two chips are labled with a goofy "F" 
> (bar over and a bar under it).  One has MB89311AP then 8704 then Z04 on 
> it, the other has MB4107 and then 8745 and then E62 on it.  Don't know 
> if any of that is particularly meaningful, but just in case...
> --Donnie

| David C Niemi  (Reston, VA, USA)  niemi at tuxers dot net |
fdutils mailing list
fdutils at tux.org

More information about the Fdutils mailing list