[sdiy] Odd MKS-70 Behaviour....

[Gavin Muir]

> The JX assigner board only has 1 RAM chip, so  bad battery should mean
> lots of randomness.

	My bad. Your right, only one RAM chip on the assigner. I guess the 
other two are somewhere else in the rats nest of my blurry schems!!

> Another possibility is that it is an early MKS70 assigner which still
> has the keyboard scanning gate array on it from the JX10.
> The gate array shares the RAM with the CPU (it writes tables of note
> on/off velocities into RAM, then interrupts the CPU to alert it to the
> change). A bad array might be scrambling only certain locations.
>
	Logically, though, would this not be happening at other times than on 
startup?

> Sounds like a fun fault to fix ;-)

	Thanks!!! Sheesh!! Oh well, time to learn a bit more about basic 
computer design!

	As I say, the unit sounds great, but this business at startup makes me 
fear its possessed!!

Thanks again,

Gavin (who was soooo proud after resurrecting his OB-8!!)

> Colin f
>
>