SSA Enhanced Adapter Front FRU 89H5667 / FC 6216
D4 Status LED Loop B
D5 Status LED Loop A
J1,9 Solder pads for SIMM sockets
J2,6 Internal SSA ports
J3 "B2" SSA Loop B Port 2
J4 Solder pads for 140 position connector
J5 Solder pads for cache socket
J7 "B1" SSA Loop B Port 1
J8 "A2" SSA Loop A Port 2
J9 "A1" SSA Loop A Port 1
J14 Solder Pads for PS/2 Serial Port
TH1 PTC Resistor
U2 50.0000 MHz osc
U4 Xilinx XC4413-PQ240C 6070
U6 31H8637 BIOS Odd?
U7 Phillips SCC2691AC1A28
U9 Solder pads for 88G6298
U12 34G1521 Miami
U13 Solder pads for Dallas DS1225AD-170
U14 40.000 MHz osc
U15 31H8636 BIOS Even?
U26-29 Solder pads for DRAM
U12 34G1521 Miami System Bus Interface. Used on i960 boards. (specs)
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 and 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:
||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.
||Both SSA links are active (normal operating condition)
||One port of a SSA loop interface is not operational
SSA Enhanced Adapter Back
J12,13 Solder pads for 40 pin connector
U17 VLSI-ARM VY86C06040
U31 Solder pads for AM29F040-120EC
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.