Welcome, Guest. Please login or register.

Author Topic: Mis-matched 1200 Kickstart ROMS?  (Read 3881 times)

Description:

0 Members and 1 Guest are viewing this topic.

Offline Doobrey

  • Hero Member
  • *****
  • Join Date: Oct 2002
  • Posts: 1876
    • Show all replies
    • http://www.doobreynet.co.uk
Re: Mis-matched 1200 Kickstart ROMS?
« on: June 20, 2005, 06:51:35 PM »
Quote

XDelusion wrote:

The 2nd this:
Kickstart V 40.63
AMiga 1200 U6B
83-94 Amiga Inc
etc



Wierd, I thought 40.63 was only ever released as a single  512k Rom for the a500/600/2000. Maybe it's one of the early VillageTronic releases?

Anyway, it won't hurt to plug it in, but if it isn't a labelling mistake then it won't boot.
On schedule, and suing
 

Offline Doobrey

  • Hero Member
  • *****
  • Join Date: Oct 2002
  • Posts: 1876
    • Show all replies
    • http://www.doobreynet.co.uk
Re: Mis-matched 1200 Kickstart ROMS?
« Reply #1 on: June 21, 2005, 08:29:05 PM »
Quote

XDelusion wrote:
Anyhow WorkBench says I have Kickstart 40.68 so I assume that maybe there is nothing wrong with this set, and that they only needed to update one of the two chips?



I'm suprised it booted at all (assuming it was a 40.63 rom)
But any changes to the code in the roms affects both chips.

Think of it like a pair of books, first word in a sentance written to book 1, next word to book2 etc etc, swapping one book with slightly different contents will mean that sooner or later you'll be reading rubbish.

Edit:
 Forgot one important thing.. there's a checksum at the end of the rom, if it doesn't match the computed checksum on startup you get a red screen. So it looks like the 40.63 chip is mislabelled
On schedule, and suing
 

Offline Doobrey

  • Hero Member
  • *****
  • Join Date: Oct 2002
  • Posts: 1876
    • Show all replies
    • http://www.doobreynet.co.uk
Re: Mis-matched 1200 Kickstart ROMS?
« Reply #2 on: June 21, 2005, 09:38:57 PM »
 :roflmao:

Just make sure you've got a matching pair of rabbits  :-)
On schedule, and suing