danieldumon
Level 1 (1 points)

Q: Booting SE/30 vs ROM sim IIfx

Goodafternoon,

Macintosh Classic SE/30  - 20MB installed

 

How do i have to interprete the following :

 

1)-with(original?) Rom simm 341-0655-A (Toshiba - 2 chips)

boots with 7.5.3 ! (and 7.0.1)

 

2)-with Rom simm IIfx (341S07 72

does not boot with 7.5.3 (freezing on welcome screen) but does boot with 7.0.1 !

(when booting, during 30 sec simasimac effect)

 

What is the cause of this ?

Thanks !

Macintosh Classic SE/30, Mac OS 8.6 or Earlier, booting SE/30 vs Rom simm

Posted on Jun 19, 2011 6:06 AM

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danieldumon

Q: Booting SE/30 vs ROM sim IIfx

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  • Helpful answers

  • by JustSomeGuy,Helpful

    JustSomeGuy JustSomeGuy Jun 19, 2011 4:38 PM in response to danieldumon
    Level 3 (586 points)
    Jun 19, 2011 4:38 PM in response to danieldumon

    danieldumon wrote:

    What is the cause of this ?

    You can't mix the ROMs from one Mac to another - they have code that is specific to each model.  OS 7.0.1 may be old/generic enough not to know the differences between machines, but 7.5.3 is trying to take advantage of something in the IIfx ROM that the SE/30 can't interpret correctly, and so hangs while booting.

  • by danieldumon,

    danieldumon danieldumon Jun 21, 2011 3:26 AM in response to JustSomeGuy
    Level 1 (1 points)
    Jun 21, 2011 3:26 AM in response to JustSomeGuy

    Thanks to "gamba"http://home.earthlink.net/~gamba2/os8_se30.html i managed to cure the SE/30 !

    Vertical raster pattern when booting does not occur anymore (this was not simasimac, as some people may think) but due to a kind of not matching Rom IIfx to the mainboard. By hacking (resedit) this pattern is gone !

  • by Appaloosa mac man,

    Appaloosa mac man Appaloosa mac man Jun 27, 2011 2:53 PM in response to danieldumon
    Level 5 (4,330 points)
    Jun 27, 2011 2:53 PM in response to danieldumon

    Actually, you can swap ROM simms but not between those two models.  That is why Just Some Old Guy qualified his comment about 7.1 being generic enough.  ROM Simms from an SE/30 are sought after to customize other computers.  I will have to look for a compatibility chart.

     

    Ji~m

     

    PS.  The simm from the IIsi (and maybe the IIcx) is also on the list.  Can't recall if they are the recipient machines or the donors.