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SCSI Controller "Cutlass"
MCA Interface Chip "Malibu"
SCSI Controller "Cutlass"
The Cutlass controller is used on all F/W SCSI variants:
I guess that the 52G9307 chip was first, some issues with it, it was then
replaced by the (relatively rare?) 61G2444 chip. Production then stayed with
the 82G2645 until end of production. Only one Differential Fast/Wide SCSI
controller chip has been seen and that is the 52G9707.
| P/N | SE/D | Remarks |
|---|
| 52G9307 | SE | Possible flaw? Not critical, affects certain scanners. |
| 61G2444 | SE | Assumed fully functional |
| 82G2645 | SE | Assumed fully functional |
| 52G9707 | Diff | Assumed fully functional |
MCA Interface Chip "Malibu"
All F/W SCSI variants use the Malibu 61G2323 MCA interface chip.
Possible MCA Interface Chip Problems (RS/6000 Specific, but may affect PS/2s?)
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Some MCA bus interface chips, P/N 61G2323 (Malibu), can cause system
problems. The third line is the datecode. The following datecodes are suspect:
1Q010013N
1Q010023N
1Q03K023N
1Q04T003N
1Q06K013N
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The entire datecode is not bad, but because of this, the whole lot is
suspect. If you have any of the symptoms below, keep in mind the SCSI-2 F/W
adapter may be the problem.
There are three types of symptoms you may see:
- Checkstops (SIO BUS 0 or 1 PARITY)
- System Hang/Unresponsive
- DMA_ERR in the Error Log
Affected Controllers
| SCSI-2 F/W Controller Type | FRU P/N | U-location |
|---|
| Integrated * | 52G4325 | U60 |
| MicroChannel SE | 11H3600 | U5 |
| MicroChannel DE | 11H7660 | U13 |
| Enhanced Microchannel DE | 52G3380 | U16 |
* The Integrated SCSI-2 F/W controller is the one on the I/O planar of the
7012-380/390/39H and 7012-3AT/3BT/3CT systems.
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