| VGA3 Working [message #7598] |
Mon, 04 May 2020 02:51 |
trick-1
Messages: 164
Registered: September 2016
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Senior Member |
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Hey Folks
So after what seems like too long I finally got around to debugging the VGA3 card. The KBD part worked straight off the bench but the v3mtst.com failed badly. So after the usual check all joints, double check 74xxxx series are right types and right spots etc I narrowed it down to a the fact that the 32K SRAM had issues (is dead? . A swap over with a spare at v3mtst.com and then the various v3pat tests worked a charm.
Of to build a new RomWBW to support the board as main console 
A>v3mtst
Checking data bit paths to memory; indirectly through addressing registers
0 error(s) detected.
Checking data bit paths to memory; directly to memory
0 error(s) detected.
Checking 32k of memory by loading the VGA font to 8 pages and
reading it back (mode=0, alt=0)
Page 0, 0 total errors.
Page 1, 0 total errors.
Page 2, 0 total errors.
Page 3, 0 total errors.
Page 4, 0 total errors.
Page 5, 0 total errors.
Page 6, 0 total errors.
Page 7, 0 total errors.
0 error(s) detected.
Checking 32k of memory by loading the VGA font to 8 pages and
reading it back (mode=0, alt=0)
Page 0, 0 total errors.
Page 1, 0 total errors.
Page 2, 0 total errors.
Page 3, 0 total errors.
Page 4, 0 total errors.
Page 5, 0 total errors.
Page 6, 0 total errors.
Page 7, 0 total errors.
0 error(s) detected.
Checking 32k of memory by loading the VGA font to 8 pages and
reading it back (mode=0, alt=0)
Page 0, 0 total errors.
Page 1, 0 total errors.
Page 2, 0 total errors.
Page 3, 0 total errors.
Page 4, 0 total errors.
Page 5, 0 total errors.
Page 6, 0 total errors.
Page 7, 0 total errors.
0 error(s) detected.
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