H734-A power supply

[Tony Duell]

> 
> 
> Joe, that is the correct number. Pat had one that I bought a few
> months ago. It takes up roughly 5" of rack space, and is the usual

Are you sure? I've never seen one (but I do have the printset somewhere), 
I thought it was a 10.5" unit, not very deep, like the H720 supply used 
to power the RK11-C. Maybe I misrememebred or there were several versions.

> black rack mounted looking ps. It will be marked with the +/- 15v
> rating and there should be one or two small Winchester power supply
> connectors on it.
> 
> I also misposted in my last msg. RK03's were the 2 meg version
> like RK05's RK02's were 1/2 the track density. As Tony pointed
> out, the big difference was individual drive select lines on
> the diablo, as opposed to 3:8 decoding on rk05's. You can mix

To be exact, the RK05 _drive_ could do either (look at the schematics, 
one of the signals on the interface connector is left open for 1-of-n 
selects, grounded for binary selects). I can also remember that the 
RK11-C uses 1-of-n selects and works fine with the RK03 or RK05, the RK11-D 
uses binary selects and works with the RK05 only.


> rk's and diablos as long as you're careful about the drive 
> selects.

Sorting out the select lines might need a couple of chips, but it's not 
very difficult.

-tony