[Coco] 6309/6809 power consumption

[Gene Heskett]

On Wednesday 16 October 2019 17:16:47 Salvador Garcia via Coco wrote:

> I can't seem to find how much current these uPs need. I know the 63xx
> uses less current than its Motorola counterpart, but can't seem to
> find this information. Can anyone point me in the right direction.
> Thank you! Salvador

The HD63C09 is a CMOS functional sorta clone of the 68x09. As a much 
newer from scratch design, and in CMOS, where the current draw is 
proportional to the clocking speed, judging by the total lack of heat 
produced, I'd have to put its current consumption at 20 ma max at the 
coco3's std clock speed.  The 2 CMOS dimm memory sticks in my 2 meg 
coco3 warms up a photo thermometer whose stem is laying on the grill 
above the memory chips shows about 2 degrees F above ambient when 
running 24/7.  And thats with a furniture blanket covering it.  There 
simply isn't any great amount of heat generated by the 63C09. However, 
if your memory is the old 1 bit nmos dynamic, 16 of them, they'll still 
warm up, possibly more because the CMOS 63x has rail to rail drive, more 
than the 68x causeing the memory to be a higher load drawing more 
current, and so will the 63c09 due to the higher current draw used by 
their address lines. I've never had that config, so I won't hazard a WAG 
what the diff might be.

Cheers, Gene Heskett
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