Electronics > Repair
ADVANTEST R9211B
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stfjohn:
Trigger at pod 07.
m k:
If you still have that manual take new memory map picture, but from I/O descriptions only.
I'm not sure and don't understand few lines.
Internal printer is clear, so only upper triplet is needed.

Since addressing style is unknown we don't know, but can guess that earlier address 5F1Cxx shouldn't be there.
That indicates a program error.

Previous set indicated that there are no bus errors.
Few earlier sets indicated that only FPU is accessed, now that seems to be different.
So FPU, DMAC and keyboard are actually all off.
Now address is 5F08xx, so RTC.

For what is actually happening we don't have enough POD pins.
So we need that address coding system revealed.

Something activates those interrupt lines, no doubt, so something is accessed.
We know that CRTC is accessed, there's text on screen, but its interrupt behavior is unknown.
Now address indicates RTC, but actual _IPL0 drop is missing.

Keep POD connections up to 08, CPU R/_W is a good sanity check.
Same POD 07 trigger.

Change
POD 09 62421 15
POD 10 62421 2
POD 11 71054 31 U52
POD 12 71054 31 U67
POD 13 71054 31 U86
POD 14 71054 19 U86
POD 15 71054 20 U86
stfjohn:
Sorry, I didn't understand the links to 71054...
m k:
D71054s are those square chips near 12V connector and one above a buzzer.
Pin 1 is marked and numbering is normal counter clockwise.
So 31 is 3rd last of 3rd side.
Last is component number.
stfjohn:
I knew this: but why  pods 11 , 12 , 13 on pin 31?
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