Strange A1200 behaviour... caused by overheating?

[patrik]

Check the text on the circuits mounted on the SIMM. If there is a -7 or -70 on the they are rated for 70ns, if there is a -6 or -60 on them they are rated for 60ns. Similar for other speeds.

When I had my a Blizzard Mark IV 68030/50Mhz I used to get somewhere around 9 mips in sysinfo with the memory-speed-jumper set to 70ns and around 10 mips in sysinfo with the memory-speed-jumper set to 60ns. You could always check that way .

You can also check the setting of the maprom-jumper by checking how big the fastram memory-block is - if it is 31.5MB then you got maprom enabled - if it is 32MB then you got maprom disabled. This can also be checked in sysinfo.


/Patrik

[patrik]

Way back when my A1200 was untowered and I was using a Blizzard1230 I had to remove the trapdoor-cover and put spacers under the 1200 to get some air under it. If I didnt - it crashed after a while. I suspect that some A1200s - like mine, are more sensitive to heat because a friend of mine later bought that card from me and used it in his A1200 without need for removing trapdoor-cover or putting spacers under the A1200. That made me realize that my A1200 isnt exactly the best one manufactured and that the Blizzard1230 was very stable indeed.


/Patrik