SSA Enhanced Adapter 4-G

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
U1 96H9834
U2 50.0000 MHz osc
U3,5,8,10 TC559128AJ-20
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:

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 Solder pads for 40 pin connector
U17 VLSI-ARM VY86C06040
U19,25 88H5516
U23 AM29F040-120EC
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.

Content created and/or collected by:
Louis Ohland, Peter Wendt, David Beem, William Walsh, Tatsuo Sunagawa, Jim Shorney, Tim Clarke, Kevin Bowling, Tomáš Slavotínek, and many others.

Ardent Tool of Capitalism - MAD Edition! is maintained by Tomáš Slavotínek.
Last update: 25 Nov 2022 - Changelog | Legal Info & Contact