Sun SPARCclassic hangs at POST

[pkhoury]

This is what I get when I try to start up. Without memory, it hangs at the exception. I'm presuming Tsunami is the CPU itself. I'm not sure if this is something that can be solved with capacitor replacement or not.

MMU Context Table Reg Test
MMU Context Register Test
MMU TLB Replace Reg Test
MMU Sync Fault Stat Reg Test
MMU Sync Fault Addr Reg Test
MMU TLB/CAM NTA Pattern Test
D-Cache RAM NTA Test
D-Cache TAG NTA Test
I-Cache RAM NTA Test
I-Cache TAG NTA Test
FPU Register File Test
FPU Misaligned Reg Pair Test
FPU Single-precision Tests
FPU Double-precision Tests
FPU SP Invalid CEXC Test
FPU SP Overflow CEXC Test
FPU SP Divide-by-0 CEXC Test
FPU SP Inexact CEXC Test
FPU SP Trap Priority >  Test
FPU SP Trap Priority <  Test
FPU DP Invalid CEXC Test
     ERROR : FPU Exception Did Not Block Store, addr = 00600000, exp = 00000000, obs = 0f884010, xor = 0f884010
     U-NUMBER : Suspect Tsunami Module
Allocating SRMMU Context Table
Setting SRMMU Context Register
Setting SRMMU Context Table Pointer Register
Allocating SRMMU Level 1 Table
Mapping RAM
Mapping ROM

 

[pkhoury]

I ended up getting a SPARCstation LX motherboard on ebay, which was supposedly tested once upon a time and lo and behold, same error. So I'm starting to wonder if it's the power supply or in need of recapping...

$$$$$   WARNING : No Keyboard Detected! $$$$$
MMU Context Table Reg Test
MMU Context Register Test
MMU TLB Replace Reg Test
MMU Sync Fault Stat Reg Test
MMU Sync Fault Addr Reg Test
MMU TLB/CAM NTA Pattern Test
D-Cache RAM NTA Test
D-Cache TAG NTA Test
I-Cache RAM NTA Test
I-Cache TAG NTA Test
FPU Register File Test
FPU Misaligned Reg Pair Test
FPU Single-precision Tests
FPU Double-precision Tests
FPU SP Invalid CEXC Test
FPU SP Overflow CEXC Test
FPU SP Divide-by-0 CEXC Test
FPU SP Inexact CEXC Test
FPU SP Trap Priority >  Test
FPU SP Trap Priority <  Test
FPU DP Invalid CEXC Test
     ERROR : FPU Exception Did Not Block Store, addr = 00600000, exp = 00000000, obs = 0f884010, xor = 0f884010
     U-NUMBER : Suspect Tsunami Module

 

[tokenalt]

I think it's a little suspicious that they got the same error at the same address with the same value.

 

[pkhoury]

I think it's a little suspicious that they got the same error at the same address with the same value.

No kidding. This happens with and without memory. The only thing I can think of is a bad breakout board (the edge connector on the system board plugs into a socket, which then gives you all the ports on the rear. Just in case, I replaced a few tantalums - mostly because I had some 22uF caps handy. Both new and old tested about the same (sadly, just learned my Fluke 179 can measure capacitance). I've had this error on three boards, so I can't figure out what the hell is going on, though all three have bad NVRAM modules. I even tried a working NVRAM from a SS5 (albeit programmed for the SS5) and that made no difference, either.