re:Zip

[butch@qedbbs.com (Gabe Sanchez)]

>In the past few months I have upgraded my ZipGS. I bought the
>new 14 MHz 65816, new 35ns wide SRAM, and soldered in a new socket
>for inserting new oscillators. However, since upgrading to 
>11.5 MHz, 64K cache, (I was unable to get it to run at all at a
>faster speed -- i.e., 12 or 12.5 MHz) the computer will operate
>fine for anywhere from 1 to 3 hours but then it will suddenly
>freeze or lock up! I installed an internal fan and am running it
>with the top off but this doesn't seem to alleviate the problem.


        First of all there is not such thing as a 14 Mhz
65816. The fastest 65816 in production is a 10 Mhz. The
reason why I am running at 14 Mhz and Long has his running
at 16 Mhz and 15 Mhz extremly reliable, is simple. You push
the 65816 to higher speeds by increasing the voltage and
adding a few capacitors etc (read Longs instructions on 
how to run 14 Mhz) I for one can tell you that the "12 Mhz"
bottle neck is not true! Hell we have one of the first 
Zip cards ever made running at 15 Mhz! You just have to
know what you are doing and do it correclty inoder 
to run past 12 Mhz. Oh BTW: another MAJOR factor that
Long forgot to mention was the fact that brand of cache 
makes a big difference as to how fast your zip will
run. Keep in mind that we are taling about skinny socket
cache chips not the wide stock ones. I am not going to
discuss brands here because it plays a major roll when
you want to run 14 Mhz and above and Long is going to 
be marketing this so If he whant to, he can tell you 
him self.


>I only have a memory card and a SCSI card installed besides the
>accelerator (4MB GS Juice Plus and an old rev C Apple SCSI). I
>have the Zip INIT settings at the "defaults". Slowing the slots
>down has no affect either.


        I have a sonic blaster card two memory cards (piggy
back, a RamFast SCSI card and the Zip ofcourse and I have
not ran into any heat related problems since I got the system
saver GS. The internal fan all it does is circulate warm air
in the case and really does not help all that much but if its
all you have then better then nothing. I suggest you get a
System Saver GS for only 29.00 bucks while they last from
quality computers :)



>I am wondering if I have done something wrong during the upgrade
>or whether I just have a flakey card/computer/whatever set-up.
>All chips and oscillators are oriented correctly and as far as I can
>tell they seem to be firmly seated.

>I've actually been living with this problem for a couple of months
>since I finish up my "sessions" with the computer before it locks
>up. Oh, another piece of info: Its been a while but I remember that
>the same thing happened at 10 and 10.5 MHz.



        Well there are many number of possibilites, again 
not having the proper capacitors or not having enough 
power, Long can veryfy this too, the voltage should NOT
be higher then 5.5 V!!

BTW: Credit must be given wherre credit is do, Long was the
friend who did my Zip and he has come over my house constaly
to test varoius other Zips with different configurations to
get the best possible out come. Beliave me he knows what he
is doing, just think, ever heard of a 16 Mhz Zip running at
no less then 100% stable? Well Long has done it!!!


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------------------------------
butch@qedbbs.com (Gabe Sanchez)  or  qed!butch
The QED BBS -- (310)420-9327