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Article #11571Will this circuit for 2 KS ROM's work?
From: Flemming Jacobsen
Date: Thu, 23 Feb 1989 12:58
Date: Thu, 23 Feb 1989 12:58
48 lines
2315 bytes
2315 bytes
Hi out there ...
I've just ordered WB1.3 with KS1.3, and now I'm wondering if it's possible
to have both ROM's (1.2 & 1.3) in my B2000.
I'm thinking of building a little board where all pins of the ROM's are
coupled in parallel except the two chipselect pins. I plan to connect them as:
------
*cs--------------*----------! !
(SOCKET) ! ----- ! OR !--- *cs(ROM1)
+5v ! +-!NOT!--! !
! ! ! ----- ------
/ ! !
10k\ ! ! ------
/ +-)--------! !
/ ! ----- ! ! OR !--- *cs(ROM2)
+-/ ---*-!NOT!---*--------! !
! ----- ------
0v
and then use the switch to select KickStart version.
Is this possible? Have I overlooked something?
If this will work: what pin is chipselect?
If it won't: Is there an equally simple way to do this?
Yes I know that you can buy boards which have space for one KS ROM and
4 sockets for the other KS version in EPROM. But I think it would be a waste
to buy a KS ROM, send it to somebody along with some money and 4 EPROMS, wait
for him/her to burn the EPROMS ,buy a board, mount the parts and put the KS
ROM away.
And I know too that it will void my warranty.
The reason that I want to do this is that I expect some copyprotections
to break under KS1.3 and a lot of software to break when 1.4 shows up. With
the board I'll be able to have 1.2 at hand any time. ( I think that 1.2
will let all the "old" things run ,as it is THE standard for "ROM-jmp'ers")
Thanks in advance.
Flemming
--
Flemming Jacobsen Kuwait Petroleum (Denmark) fj@kpd.dk
Kollegiebakken 9 v3213 Hummeltoftevej 49 ..!uunet!mcvax!dkuug!kpd!fj
DK-2800 Lyngby DK-2830 Virum
+45 2 883231 +45 2 859333x564
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!nrl-cmf!ames!pasteur!ucbvax!decwrl!sun!pitstop!sundc!seismo!uunet!mcvax!kth!enea!dkuug!kpdp!fj From: fj@kpd.dk (Flemming Jacobsen) Newsgroups: comp.sys.amiga.tech Subject: Will this circuit for 2 KS ROM's work? Message-ID: <151@kpdp.kpd.dk> Date: 23 Feb 89 12:58:53 GMT Organization: Kuwait Petroleum (Danmark) A/S Lines: 48