Re: Stability of 15 MHz ZipGS

[spec@vax2.concordia.ca (Mitchell Spector)]

In article harold.h@genie.com (Harold Hislop) writes...
> 
>Sheash, you like overloading a IIgs supply, don't ya :)
>  
>Check your Zip, look for a component at Q2. If present then your 816
>is being powered off the +12 rail Q2, R7, R8 regulate this down to
>approx 5.5 volts). If Q2 is not present they your 816 is powered
>from the +5 rail.

   Looking at both ZipGS boards (8/16 and 15/64), neither have any
components soldered to Q2, R7 or R8. Some components have been added
to C16, C17 and C19 on the 15/64 however, which are not present on
the 8/16.

>Given what you have in the machine, I'd bet you supply's +5 leg is
>rather overloaded... Might want to think about finding an old Vulcan
>(best internal IIgs power supply ever made) or maybe using a PC supply
>(Now you have an excuse to re-case your IIgs in a tower ;-)

   That's most likely the case, hopefully replacing my 60 watt Apple
supply with a 150 watt PC supply will clear things up (in the meantime,
most of my system is stripped down to lessen the load on the powersupply)
This has greatly helped, although I'm still noticing the occational
freeze-up or other strange things...

   When using ProTERM 3.1, for example, the blinking underscore cursor 
and mouse pointer disappear. Or the mouse pointer gets stuck in an area 
on screen and flickers madly (I have to clear this by doing a Control-
Reset). Yet another problem, I went to access the scrollback buffer 
yesterday and everything froze with a strange pattern of inversed 80 
columns text. Under GS/OS, when making an attempt to access FTA's SuperZip 
CDA, quite often I get a crash into Monitor or things freeze up after 
pressing Return. I even went as far as to try a few game titles, those 
too would freeze up (Zany Golf freezes when loading between levels,
and during Xenocide the game just simply froze up once). 

>-Harold Hislop
>Hardware Coordinator,

Mitchell Spector
spec@vax2.concordia.ca