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Article #11571

Will this circuit for 2 KS ROM's work?

#11571
From: Flemming Jacobsen
Date: Thu, 23 Feb 1989 12:58
48 lines
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
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Message-ID: <151@kpdp.kpd.dk>
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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