Difference between revisions of "Repair help"

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(Created page with "==MVS== ===No sound=== *Backup RAM corrupt, SOUND_STOP ($D00046) is non-zero. Clear Backup RAM. Category:Chips")
 
(MVS)
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===No sound===
 
===No sound===
 
*Backup RAM corrupt, SOUND_STOP ($D00046) is non-zero. Clear Backup RAM.
 
*Backup RAM corrupt, SOUND_STOP ($D00046) is non-zero. Clear Backup RAM.
 +
 +
===Z80 error===
 +
 +
Can be caused by bad components / continuity with the following:
 +
*Z80 <-> SM1
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*Z80 <-> RAM
 +
Second generation specific (todo: get pin numbers in a nice table)
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*Z80 <-> NEO-D0 (NMI,A2-A4,IORQ)
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*Z80 <-> NEO-C1 (Z80 D0-D7)
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*NEO-D0 <-> NEO-C1 (Z80R,Z80W,Z80CLR,SDW)
 +
  
 
[[Category:Chips]]
 
[[Category:Chips]]

Revision as of 05:12, 30 June 2011

MVS

No sound

  • Backup RAM corrupt, SOUND_STOP ($D00046) is non-zero. Clear Backup RAM.

Z80 error

Can be caused by bad components / continuity with the following:

  • Z80 <-> SM1
  • Z80 <-> RAM

Second generation specific (todo: get pin numbers in a nice table)

  • Z80 <-> NEO-D0 (NMI,A2-A4,IORQ)
  • Z80 <-> NEO-C1 (Z80 D0-D7)
  • NEO-D0 <-> NEO-C1 (Z80R,Z80W,Z80CLR,SDW)