Sun 3 bootrom souce - Put a 3-160 into a 3 slot pizza box

I kept a few things, including two of the 3 slot giant "pizza" boxes. These have an actual 3 slot sun VME backplane. In this was, they are unlike the pizza boxes for the sun 3/60 and the like which only supply power. I run a 2 card setup consisting of a 3/260 along with an 16M ECC memory board in one of them.
This now somewhat surprises me, as I have learned that the 3/260 can pull up to 22 amps of current. That this works along with the ECC card suggests that the power supply in these boxes can deliver at least 30 amps!

These boxes sometimes had stabilizing "wings" (forming a base) that allowed them to be set vertically alongside of a desk. I have long ago removed and discarded these wings.

The other one is on my "workbench" right now. It is labeled Sun 3/140. As it turns out a 3/140 uses the same cpu board as the 3/160 and 3/180, just in this 3 slot box rather than the big 12 slot chassis the 3/160 used. In my box is a Sun 3/160 board along with a Parity systems memory board in the second slot. I think the Parity system board holds an additional 4M of ram, and could hold more (up to 12M?) if it was fully populated.

To remove boards from the box, you need a 2mm Allen key. You also should take care using the extractor levers as the 40 year old plastic composite they are made of may be getting old and brittle.

Which way is up? Lay the box on your workbench with the power connector on your left and it is right side up. This is important, because I always put the master board in the bottom slot (requiring you to know up from down). In the system I am now working with the 3/160 board goes in the bottom slot and the memory expansion goes in the middle slot right above it.

Let's fire it up!

Next we connect a serial cable. I have a USB to serial cable with a PL2303 chip. Linux is happy to call it ttyUSB0. I find a 9 to 25 pin cable and also need a null modem adapter. I type some returns and get a ">" prompt from the monitor.

With the switch in either the DIAG or NORM position, pressing reset gives me (after perhaps a 10 second wait) :

Watchdog Reset!
>

EEPROM: Using RS232 A port.
Selftest Completed.

Sun Workstation, Model Sun-3/160M.
ROM Rev 3.0, 4MB memory installed, Serial #17403.
Ethernet address 8:0:20:1:DB:0, Host ID 110043FB.


Testing 4 Megabytes of Memory ... Completed.

Auto-boot in progress...

EEPROM boot device...Boot: ie(0,0,0)
ie: No Carrier
ie: No Carrier
Requesting Internet address for 8:0:20:1:DB:0

Boot PROM Selftest

PROM Checksum Test
DVMA Reg Test
Context Reg Test
Segment Map Wr/Rd Test
Segment Map Address Test
Page Map Test
Memory Path Data Test
NXM Bus Error Test
Interrupt Test
TOD Clock Interrupt Test
MMU Access Bit Test
MMU Access/Modify Bit Test
MMU Invalid Page Test
MMU Protected Page Test
Parity Test
Memory Size = 0x00000004 Megabytes
Memory Test (Testing 0x00000004 MBytes)   Testing...

Selftest passed.

Type a character within 10 seconds to enter Menu Tests...
                                                          (e for echo mode) EEPROM: Using RS232 A port.
Selftest Completed.

Sun Workstation, Model Sun-3/160M.
ROM Rev 3.0, 4MB memory installed, Serial #17403.
Ethernet address 8:0:20:1:DB:0, Host ID 110043FB.


Type a character within 10 seconds to enter Menu Tests...

Diagnostic Auto-boot in progress...
Invalid device = ''
>

All very good. Note that the ROM version is 3.0.