[Coco] 6809 to 6309 Switcher Help...Semi Related: ROM switcher ?

[Bruce W. Calkins]

It can be done.  One pin of each ROM would need to be switched.  So they 
could easily be piggybacked.  Optionally a larger EPROM would be burned 
with the appropriate address line(s) switched.  It has been a while, I 
would have to look at the pin-outs to reremember which pins need to be 
involved.

Bruce W.


On 11/20/20 10:27 AM, coco at jechar.ca wrote:
> 
> Semi Related:
> 
> I have a Coco whose 32K ROM is replaced by a Boot to Drivewire
> ROM that only works to boot OS-9 from a drivewire server wondering
> if there is a physical switch to allow one to switch between
> two 32K ROMs so the original that has just bin sitting in a drawer
> for years could be switched in to let me run COCO BASIC tape programs 
> and use game cartridges and Disk Basic.
> 
> 
> On 2020-11-12 11:33, Mark D. Overholser wrote:
>> On 11/10/20 8:18 PM, William Carlin wrote:
>>> Thanks Mark.  Did you run a switch to the back/side of the CoCo to 
>>> toggle between CPUs?
>>>
>>> William Carlin
>>>
>>
>> I installed, Pin Headers, so I could test with a Berg Jumper, and later
>> install a Switch on a short cable to mount it externally.
>>
>> MarkO
>