🚀 go-pugleaf

In article <8601040742.AA05555@ucbvax.berkeley.edu> ugjohna@BUFFALO.CSNET (John Arrasjid) writes:
>For those of you who read the article in net.micro.atari about upgrading to
>1meg of memory on the ST, DON'T!!!! 

I guess I was a lucky one.  I've upgraded to 1Meg and everything worked
right the first time.  I have to disagree about the clarity of Gert's
instructions.  I found them very easy to follow, providing step-by-step
guidance through the procedure.  My guess is that you fried a DRAM (they're
**very** intolerant of static electricity...  Did you ground yourself to a
local ground every time you handled them?   

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
No problem is so formidable that you can't just walk away from it.
                     
    Steve Tynor
    Georgia Instutute of Technology

 ...{akgua, allegra, amd, harpo, hplabs,
     ihnp4, masscomp, ut-ngp, rlgvax, sb1,
     uf-cgrl, unmvax, ut-sally}  !gatech!gitpyr!tynor

You probably got your wires on the bottom of u15 in the wrong places.
The instructions are a bit wrong in that the chip counts clockwise from the 
bottom(wirng side).  You probably haven't fried anything.  You should,
however, install the other three 68 ohm resistors in series with
the RAS and CAS lines for the original memory chips.  I  just did  3
units this weekend and all work well.  The symptom you describe can
be duplicated by moving the wires on  u15.  Also, if you don't put
the filter capacitors back in, the exact same symptom will occur, with
 NO damage if not left on for too long.

I have successfully upgraded my 520ST to 1MEG using the original 
instructions posted to the net.  I have the following questions to ask:

	1) has anyone successfully upgraded to 1MEG using the new,
	   revised instructions?

	2) has anyone who successfully upgraded using the old instructions
	   gone back and successfully retro-fitted the resistors?

	3) has anyone with the 1MEG upgrade installed ROMS (not EPROMS) 
	   successfully?  (either with or without the extra resistors)

Thanks in advance for the info.

Barry Locklear
AT&T Information Systems Labs
Denver, CO
ihnp4!druhi!lbl
(303) 538-7245

>For those of you who read the article in net.micro.atari about upgrading to
>1meg of memory on the ST, DON'T!!!!  First of all, the references to the 
>different gauge tinned bus wires and non-tinned bus wires are not clear as
>are the directions for adding the resisters to pins 6, 7 and 8 of the memory
>controller. Second of all, when you finally get all the wiring done and turn
>on the computer, the screen comes on for about 2 seconds and then goes blank
>without booting the drive. Trying to reboot again does the same thing. I 
>suggest to all of you to wait for some kind of commercial memory upgrade
>before you fool with your ST. If anyone can tell me what chips I fried from
>my description, I'd appreciate it. I hope they were just the memory chips. (I
>tried the two TOS chips, the drive controller, and the graphics chip in another
>520ST and they work fine, so that just leaves the MMU, GLUE, and the memory 
>chips.

>John Arrasjid                        SUNY/Buffalo Computer Science

I missed the article about the 1 Meg upgrade. Could you 
please send a copy to me. Maybe I can figure out what is
wrong.      Thanks

                                terry

I missed the 1 Meg upgrade article. Would you send
a copy to me. I may be able to correct the problem
or have a better understanding of what is involved.
Thanks in advance......

                             Terry McNeill
                         13941 Olive Mesa Ct.
                         Poway, Ca. 92064

              or         Via Electronic Mail