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Features
SCSI I/O Controller 4-1
Term Power Overload Protection
Features
- Accepts multiple commands per device SCSI chain
- SCSI burst 4.0MB per second (synchronous) SCSI-1 transfer
- SCSI initiator (command issuer)
- SCSI parity support (Ed. IBM standard)
- One adapter per system (Ed. Software issue?)
- Micro Channel Interface
- 4-byte (32-bit) Bus Master
- Streaming data support (Ed. Good for a SCSI-1 adapter)
- Address and data parity support
- Interrupt levels 3, 4, 5, 7, 10, 11, 12, 14
SCSI I/O Controller 4-1 Adapter ID 8D77, FRU P/N 31G9729, FC 2828
D1 Diode
DL1,2 PE 23111 Delay Line
F1 1 A / 125 V Littelfuse (fast blow)
J1 High Availability Jumper
J2 Mini-C60 SCSI port
U1,5 CXK58257AM-12L 32Kx8 SRAM
U2 31G9727 SCSI BIOS?
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U3 31G9725 SCSI BIOS?
U11 80C186-16
U13 31G9723
U17 81F8929(ESD)
U36 WD33C93A
Y1 31.9500 MHz osc
Y2 39.95 MHz osc
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No components on the solder side.
J1 (also called P3) High Availability Jumper
Must be out of the circuit for high availability ("Y") configuration.
Put the jumpers over one row only so you don't loose them. There are 13
pairs of pins. You will need a 6 and 7 pair berg jumper (ganged jumper)
in order to use this for normal SCSI configuration.
Term Power Overload Protection
The SCSI controller provides term power for the SCSI bus; connect devices to
the bus so they do not provide term power. The controller uses a fuse that must
be replaced after failure.
Do not connect or disconnect any SCSI device while power is on. Such "hot
plugging" is forbidden because this practice may blow the controller fuse,
corrupt data or permanently damage SCSI controller chips in controllers or
devices.
The fuse on an SCSI controller protects the external and internal SCSI bus.
The fuse may be blown by a defective cable, terminator, or device attached to
the controller, but not by a defective controller.
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