RE: Asteroids Vector rom access

Could it be a flaky socket beneath the vector ROM?
  -----Original Message-----
  From: owner-vectorlist@vectorlist.org
[mailto:owner-vectorlist@vectorlist.org]On Behalf Of Kevin Moore
  Sent: Tuesday, January 19, 2010 5:04 PM
  To: vectorlist@vectorlist.org
  Subject: VECTOR: Asteroids Vector rom access

  I've been fighting an asteroids board most of the day. V. 4 board
Problems ranging from shorted ram lines, to bad dataline buffers etc. I've
almost got this thing to run, but when I do sigs on the Vector rom, they are
unstable. They are also unstable on R2 the VG data buffer. All other sigs
look good. I thought that the data buffer was bad, as it looks like it uses
DMA to access the vector rom at np3. So I went ahead and swapped it out, but
still getting unstable sigs. I'm using a known good rom. Just seem to be
having a hard time wrapping my tiny brain around how the vg rom is accessed,
and what could be causing the bad sigs.

  I've triple checked my setup, and it looks good. The NOP setup sig checks
out..

  Can anyone help me get a better understanding of what could be happening
with the Vrom?

  Thanks,

  Kevin

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Received on Wed Jan 20 17:34:26 2010