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- Path: soap.news.pipex.net!pipex!usenet
- From: m.hendry@dial.pipex.com (Mathew Hendry)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: A500 and KS 2.04 Help Needed
- Date: Fri, 12 Apr 96 17:22:42
- Organization: Private node.
- Message-ID: <19960412.40EB98.FC71@al040.du.pipex.com>
- References: <Dpn0sp.B8H@linex1.linex.com>
- NNTP-Posting-Host: al040.du.pipex.com
- X-Newsreader: TIN [AMIGA 1.3 950726BETA PL0]
-
- Bernhard A. Rieckhoff (bar@canuck.englewood.geoquest.slb.com) wrote:
- : In article <1190.6674T714T586@studbox.uni-stuttgart.de>,
- : Snowy@studbox.uni-stuttgart.de (Nicholas Stallard) writes:
- : SNIP..
- : >HH> A500's mother board. She told me that since my MB is Rev. 5, I needed to
- : HH> either by a ROM switcher or do a soldering job myself. I wonder if anyone
- : HH> has the instructions to do this modification.
- :
- : >
- : SNIP...
- :
- : I have an A500, rev 5 b , My 2.04 rom had a wire soldered from pin 1 to 31
- : (i think), otherwise it was just normally plugged in. When I got my 3.1 rom
- : I first just stuck it in, that didn't work. then I reproduced the jumpering
- : on the 2.04 rom (I stripped a braided wire and wire-wrapped a strand to the
- : two pins). That also failed, but I had a snippet from CSA.Hardware and
- : followed the destructions below, -worked fine for me. (BTW I didn't solder,
- : just inserted copper strands into the relevant pin sockets.I also didn't
- : buy an additional socket.I did reproduce the shorts and bent pin though.)
- :
- : -----begin quote
- :
- : On a Rev 3 & 5 A500, the ROM must have some jumpers and a 40 pin socket
- : attached for it to work properly.
- :
- : On the socket, jumper pins 1 & 31. On the ROM, bend pin 31 so that it will
- : not go into the socket. Jumper (on the ROM) pins 31 & 21. Insert the ROM
- : into the socket, and the socket into the motherboard. When finished, pin 31
- : of the ROM should be hanging outside the socket, not connected to anything
- : except the jumper wire that you added.
-
- Perhaps a better method would be to use two sockets stacked on top of one
- another (if they will both fit - from my machine's innards it looks like they
- will). Connect the 1 - 31 jumper on the lower socket, and perform those
- operations described above for the ROM on the upper socket. That way you avoid
- having to hack around with the ROM itself, if doing so bothered you for some
- reason.
-
- -- Mat.
-