Data sheet for MC6825

From: Dwight K. Elvey <dwight.elvey_at_amd.com>
Date: Mon Dec 15 15:05:10 2003

>From: "Holger Veit" <holger.veit_at_ais.fhg.de>
>
>On Mon, Dec 15, 2003 at 11:21:10AM -0800, Vintage Computer Festival wrote:
>> On Mon, 15 Dec 2003, Dwight K. Elvey wrote:
>>
>> > Does anyone have a data sheet for a Motorola MC6825?
>> > I believe it is a USART but I can't find anything on
>> > it. It is from the late 70's.
>>
>> I can only imagine at this point that it was a custom or internal part
>> because I can't find any mention in any of my Motorola data books
>> (several) nor the Master Selection Guide (1992).
>
>Do you mean by chance the MC68HC25?

Hi
 No, this is a uP. this part is way to early to be a HC anything.
Maybe I got the number wrong. I'll check it and be back tomorrow.
It is from a Poly 8813 floppy controller board. This is a hard
sectored interface so I suspect that it is some kind of USART.
I was getting the number from my memory instead of writing it
down.
Dwight

>
>This is an I/O expander (port replacement) chip for various microcontrollers
>such as the 146805E2, 6801, 6801U4, 6803, 6803U4 and 68HC11.
>It comes in a 52 pin PLCC package.
>
>Its purpose is to provide the I/O ports of a microcontroller that get "lost"
>if the system is expanded with external ROM/RAM (some ports of these uCs then
>are used as the data bus and the multiplexed address bus).
>
>The data sheet I have is from 1990, not 1970's, though.
>
>Holger
>
Received on Mon Dec 15 2003 - 15:05:10 GMT