[Coco] 26-3029 floppy disk controller.

[jdaggett at gate.net]

Most likely an MCM68364 or MCM68366 masked programed rom. Looks 
like an SC # that Motorola would issue to a customer when they submit  rom 
paterns for memory chips. This would allow Motorola internal tracking to 
align to a customer request. 

The MCM68764 and MCM68766 are EPROM versions of the 
MCM68364/66. If I remember correctly the mask rom parts were faster 
acess than the EPROM counter parts. 

james

On 16 Jan 2006 at 11:59, Roger Merchberger wrote:

Date sent:      	Mon, 16 Jan 2006 11:59:41 -0500
To:             	CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
From:           	Roger Merchberger <zmerch at 30below.com>
Subject:        	Re: [Coco] 26-3029 floppy disk controller.
Send reply to:  	CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
	<mailto:coco-request at maltedmedia.com?subject=unsubscribe>
	<mailto:coco-request at maltedmedia.com?subject=subscribe>

> 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.
> 
> Except 27128's are 28-pin (as are 2764's)... If it holds 8K, it might be a 
> Motorola 68764/68766 pinout. These were used on (at least some) CoCo1's and 
> 2's. I don't know if there were 16Kbyte ROMs in a 24-pin package.
> 
> I still have a metric buttload of Moto 68764/6's in several different 
> access times if anyone needs any...
> 
> Laterz,
> Roger "Merch" Merchberger
> 
> --
> Roger "Merch" Merchberger   | Anarchy doesn't scale well. -- Me
> zmerch at 30below.com.         |
> SysAdmin, Iceberg Computers
> 
> 
> -- 
> Coco mailing list
> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco