Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 (Denver Mods 7/26/84) 6/24/83; site druhi.UUCP
Path: utzoo!watmath!clyde!cbosgd!ihnp4!drutx!druhi!lbl
From: lbl@druhi.UUCP (LocklearLB)
Newsgroups: net.micro.atari
Subject: Re: 1meg upgrade killer
Message-ID: <92@druhi.UUCP>
Date: Mon, 6-Jan-86 14:45:53 EST
Article-I.D.: druhi.92
Posted: Mon Jan  6 14:45:53 1986
Date-Received: Tue, 7-Jan-86 04:33:10 EST
References: <8601040742.AA05555@ucbvax.berkeley.edu>
Organization: AT&T Information Systems Laboratories, Denver
Lines: 35

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