Re: Problems running VIMM & VVV (Was: 2114 chips needed?)

From: MagerValp (MagerValp_at_cling.gu.se)
Date: 2001-01-10 16:20:10

>>>>> "Pasi" == Ojala Pasi 'Albert' <albert@cs.tut.fi> writes:

Pasi> I would advice you to make a uniqueness test also. Poke the high
Pasi> part of the address to each location, and only after this read
Pasi> them back.

When doing this, I discovered that everything that's written to $2400
shows up at $2000, same with $2c00/$2800, $3400/3000 and $3c00/$3800.
Looks like A10 is always low. Visual inspection and a bit of prodding
shows that the pin doesn't make full contact.
  Sounds like we have a winner, thanks.

PS: I expanded the memory test program to incorporate address bus
    testing.

-- 
    ___          .     .  .         .       . +  .         .      o   
  _|___|_   +   .  +     .     +         .   .  Per Olofsson, konstnär
    o-o    .      .     .   o         +          MagerValp@cling.gu.se
     -       +            +    .     http://www.cling.gu.se/~cl3polof/
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