Posted By
crock
on 2012-01-25
08:10:33
 |  Re: First Beta Release of Diag264 (0.2B)
The transients (and the floating bus checksums) could be checked with a cycle exact, stable raster or (I'm speculating a bit here) writing 1 to the TED off bit (no DMA, single clock, etc.).
That's stretches the boundaries of my understanding Gaia, could you explain the theory of that? Is there any practical application of turning the TED off?
I made the expansion area scanner and ran it on a C116 and a plus/4. The + symbol means that a stable result is read for at least 255 reads and - means (of course) the opposite).
Interesting. As expected, I only see stable values at FD00, FD10 and FD30 on real iron. The area from FF20 to FF3D is normal ROM/RAM. One of the things I found while developing Diag264 was that reading the 2 'fake' registers at FF3E and FF3F return the contents of ROM if ROM is visible but will never return the contents of RAM - I think you always see 00 on real hardware.
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