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SSA Enhanced Adapter Front FRU 89H5667 / FC 6216
D4 Status LED Loop B
D5 Status LED Loop A
J1,9 Pads for SIMM sockets
J2,6 Internal SSA ports
J3 "B2" SSA Loop B Port 2
J4 Pads for 140-pin connector
J5 Pads for cache socket
J7 "B1" SSA Loop B Port 1
J8 "A2" SSA Loop A Port 2
J10 "A1" SSA Loop A Port 1
J14 Pads for PS/2 Serial Port
TH1 PTC Resistor
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U1 96H9834
U2 50.0000 MHz osc
U3,5,8,10 TC559128AJ-20
U4 Xilinx XC4413-PQ240C 6070 (HardWire)
U6 31H8637 BIOS Odd?
U7 Phillips SCC2691AC1A28
U9 Pads for 88G6298
U12 34G1521 "Miami" MCA iface
U13 Pads for Dallas DS1225AD-170 8Kx8 NVRAM
U14 40.000 MHz osc
U15 31H8636 BIOS Even?
U26-29 Pads for DRAM
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I noticed that the Micro Channel SSA adapters all use the same PCB. Dan
Kalish, mouthpiece for the Micro Channel Mafia, sent me a 4-G so I could
get it right.
U6 &U15
31H8637 BIOS Odd / 31H8636 BIOS Even. The 4-G uses the same P/N
BIOS as the 4-I. This makes me hopeful that a common ADF and drivers can be
used for all MCA SSA adapters.
Light Pipes on D4 & D5
Both LEDs are normal LEDs on the PCB. There are light pipes to
transmit the light to the outside.
Each pair of connectors has a green light that indicates the operational
status of its related loop:
| Status |
Meaning |
| Off |
Both SSA connectors are inactive. If disk drives or other SSA adapters
are connected to these connectors, either those disk drives or adapters
are failing, or their SSA links are not active. |
| Solid |
Both SSA links are active (normal operating condition) |
| Slow Flash |
One port of a SSA loop interface is not operational |
SSA Enhanced Adapter Back
J12,13 Pads for 40-pin connector
U17 VLSI-ARM VY86C06040
U19,25 88H5516
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U23 AM29F040-120EC
U31 Pads for AM29F040-120EC
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40 MHz version of the ARM6 Application-Specific Standard Product (ASSP)
version of the new ARM processor, designed the VY86C06040, is pin-to-pin
compatible with lower clock frequency versions. It operates with a 40 MHz clock
and exhibits a peak performance of 40 MIPS and a sustainable performance of 26
MIPS at 5.
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