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Hardware Details

The Solbourne Shack does not provide much information on the actual components found on the S4000 motherboard. They are:

• The infamous Panasonic KAP processor. Mine has the M2C5 mask, which means most of the hardware bugs have been fixed.
• The SCSI controller is the SBIC WD33C93A. This is a very popular SCSI controller among Unix workstations, which you can find, for example, on the SGI Indy and Indigo2 machines.
• The on-board ethernet is the ubiquitous AMD LANCE (7990).
• The serial ports are driven by two Zilog ZSCC (Z8530) chips. However, the Solbourne keyboard is not compatible with the Sun one, and uses different scan codes as well, since it is an AT-compatible keyboard with extra L and R sets of keys.
• The audio chip is the simple AMD 7930, also encountered on SPARCstation 1 and similar machines.
• The floppy drive being reported to be the same as on SPARCstation 1, the floppy controller must be 82072 compatible.
• And this machine had an sga20 SBus frame buffer, based upon a Solbourne-specific engine, and a Bt458 RAMDAC. This frame buffer will not work correctly in a Sun machine - not only will the PROM not be able to operate it, but it will also prevent the machine from booting without manual intervention.

For some reason devinfo does not work for me at the OS/MP prompt, so here is a PROM show-tree output:

Node: Root
 model=S4000
 name=KAP
 cpu=
 Node: lance-device
 reg=
 intr=
 driver=ei
 name=lance
 model=AMD 7990
 type=network
 Node: uart
 name=Z85C30
 Node: Keyboard/Mouse
 reg=
 intr=
 driver=zs
 name=zs
 model=Z8530 SCC
 Node: Ports A/B
 reg=
 intr=
 driver=zs
 name=zs
 model=Z8530 SCC
 Node: Sbus
 name=Sbus
 Node: scsi-chip
 reg=
 intr=
 driver=si
 name=scsi
 model=WD33C93A
 type=io
 Node: Target0
 Node: Target1
 Node: Target2
 Node: Target3
 Node: Target4
 Node: Target5
 Node: Target6

Note that the floppy driver does not appear in the device tree. Of course, OS/MP correctly probes it:

OS/MP 4.1C Export(GENERIC/root)#0: Fri Mar 18 14:33:28 1994
[...]
mem = 16384K (0x1000000) 16M
avail mem = 13049856
assign sbus slot 3 to sga0
enabling ECC
cpu = KAP
si0 at sbus 0x40000020 pri 4 
si0: 20MHz WD33C93A ucode 0: R2.3: id 7: synch: offset 12: 5.00MB/sec
sa0 at si0 slave 0
sa1 at si0 slave 0
st0 at si0 slave 4
st1 at si0 slave 5
sd0 at si0 slave 0
sd1 at si0 slave 1
sd2 at si0 slave 2
sd3 at si0 slave 3
sr0 at si0 slave 6
fdc0 at obio 0x8000c000 pri 11 
fd0 at fdc0 slave 0
zs1 at obio 0x80004000 pri 3 
zs0 at obio 0x80008000 pri 3 
ei0 at obio 0x40000030 pri 6 
Ethernet address = 0:0:8e:1:1:97
ei0: 0:0:8e:1:1:97
sga0 at sbus 0x30000000 pri 6 
sga0: sga20 resolution 1152 x 900
audioamd0 at obio 0x80010000 pri 9 

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miod@online.fr