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- Path: sparky!uunet!ogicse!uwm.edu!zaphod.mps.ohio-state.edu!darwin.sura.net!eng.ufl.edu!wonderhog.eng.ufl.edu!kent
- From: kent@wonderhog.eng.ufl.edu (Kent Phelps)
- Newsgroups: comp.sys.zenith
- Subject: Re: Z-386/16 memory board upgrade info?
- Message-ID: <1992Nov17.161800.6523@eng.ufl.edu>
- Date: 17 Nov 92 16:18:00 GMT
- Article-I.D.: eng.1992Nov17.161800.6523
- References: <1992Nov17.002150.60825@ns1.cc.lehigh.edu>
- Sender: news@eng.ufl.edu (Usenet Diskhog System)
- Reply-To: kent@wonderhog.eng.ufl.edu ()
- Organization: University of Florida, Digital Design Facility
- Lines: 39
-
- In article <1992Nov17.002150.60825@ns1.cc.lehigh.edu> twb0@ns1.cc.lehigh.edu (Thomas Brown) writes:
- >An article was posted recently stating that there was an upgrade which
- >could be performed on the Zenith 386/16 1-meg 32-bit memory card which
- >would allow it to take 1MB DRAM (to upgrade the board to 4-megs).
- >
- >I would appreciate any information on this upgrade; feel free to post
- >to the net so that others can view it as well.
- >
- >Thanks much,
- >-Tom
-
- OK - here is the info you guys asked for. To upgrade the Zenith 1 Meg card
- to a 4 Meg card do the following steps:
-
- 1) remove all the 256k memory chips
- 2) remove the memory chip sockets VERY CAREFULLY.
- 3) remove the solder from the holes for the 18 pin
- sockets ( the 18 pin holes are offset to the left )
- 4) install the 18 pin sockets
- 5) change U464 from a 444-558 to a 444-529
- 6) change U470 from a 444-559 (or a 444-670) to a 444-530
- 7) move R405 to R404
- 8) move R406 to R407
- 9) remove R410
- 10) 33 ohm resistors should be added at R14, R15, and R16
- 11) install the 1 Meg DIP chips
-
- Suffice it to say this modification is not for the light at heart. Removing
- 36 16-pin sockets and clearing the holes for 36 18 pin sockets should only
- be attempted by someone who is very familiar with proper soldering techniques.
- The 444-529 and the 444-530 can be purchased from ZDS and I assume any ZDS
- dealer. You might even be able to get them from Heath.
-
- Good Luck!
- --
- Kent Phelps | Internet: kent@eng.ufl.edu
- Digital Design Facility | Phone: 904-392-2464
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