[Coco] 26-3029 floppy disk controller.

[Mike Pepe]

Roger Merchberger wrote:
> Rumor has it that Paul T. Barton may have mentioned these words:
> 
>> Just received a 26-3029, where the '9' has been added
>> as a sticky tag. Inside is the non-gold PCB, with
>> a MB8877A controller chip (40-pinner) also has
>> the socketed WD9216 data separator.  Wow, this one
>> has been a target, not hoped to ever see. It looks
>> useable but has not been tried. Socketed ROM
>> SCM92128P, probably a 27128-OTP type, 24-pins.
> 
That is indeed a Motorola-pinout mask ROM with 8K of Disk Basic, not a 
27128.

Some of the later "short" cart controllers have a 28 pin 2764 compatible 
ROM.

As a side note, a CoCo 1 or 2 has 16K of external ROM space. A CoCo 3 
can have 8,16,or 32K. By default, however, the address range $E000-$FDFF 
is used by the "super" basic, leaving 8K for external ROM.

I suppose this means that it's not possible to use a 16K 3rd-party disk 
BASIC ROM on a CoCo 3.