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501-1378
3/60LE motherboard
20MHz 68020, 20MHz 68881 floating point chip, Sun-3 MMU with eight hardware
contexts, up to 12M on-board SIMM memory. No bus interface, but a P4
connector for a color video board or other option -- not the same as the P4
in the 3/80 or any SPARC model.
From left to right, the back edge of the board has: a female DB15
keyboard/mouse connector; eight LEDs (bit 0 to the right); a switch to toggle
between Normal and Diagnostics modes; a BNC thin Ethernet connector; a female
DB15 AUI Ethernet connector; two female DB25 serial port connectors (ports B
and A from left to right); and a female D50 SCSI port connector. Above these
are an upper row of cutouts or connectors for color video and other options.
Pin 1 is usually in the upper right corner of all connectors. Unconnected
pins are not listed.
The pinout of the keyboard/mouse connector is:
1 RxD0 (keyboard) 8 GND
2 GND 9 GND
3 TxD0 (keyboard) 10 VCC
4 GND 11 VCC
5 RxD1 (mouse) 12 VCC
6 GND 14 VCC
7 TxD1 (mouse) 15 VCC
The eight LEDs are used for diagnostic purposes. In the chart below, a "1"
indicates a lit LED, and a "0" indicates an unlit LED. The pattern is shown
right to left, as it appears on the LEDs.
Pattern Status
-------- ------
11111111 Resetting
00000001 PROM checksum test
00000011 Context register test
00000100 Segment map read/write test
00000101 Segment map address test
00000110 Page map test
00000111 Memory path data test
00001000 Nonexistent memory bus error test
00001001 Interrupt test
00001010 Time-Of-Day clock interrupt test
00001011 MMU protection/status tests
00001110 Parity error test #1
00001111 Parity error test #2
00010000 Memory test
10000000 Self-tests have found an error
01000000 An exception class error occurred
"Marching ones" (cycling through 10000000, 01000000, 00100000, etc.)
indicates that Unix is running OK. On power up, it cycles through the tests
in the chart above, then boots Unix. If LED 7 (10000000) lights up while
the tests are being performed, it indicates that the test failed. If LED 6
(01000000) lights up with the tests are being performed, it indicates that
an unexpected error (bus error, address error, unexpected interrupt, etc.)
occurred during the test. When all tests are finished, LED 5 (00100000)
starts blinking to indicate that the ROM monitor is running and/or Unix is
booting.
If you want the machine to boot normally, set the diagnostics switch to
"NORM". If you want extended diagnostics when you power up the system, set
the switch to the "DIAG" position. If the switch is set to "DIAG", power-on
self-test messages are sent to serial port A at 9600 bps, 8 data bits, one
stop bit, no parity, and XON/XOFF flow control.
Whether the BNC or AUI Ethernet connector is use is controller by part of
J800. The pinout of the AUI Ethernet connector is:
1 chassis ground 7 VCC
2 E.COL+ 9 E.COL-
3 E.TxD+ 10 E.TxD-
4 chassis ground 12 E.RxD-
5 E.RxD+ 13 +12V
6 GND
The serial ports conform to both RS-232-C and RS-423 and are wired DTE. The
pinout of the serial ports is:
2 TxD (transmit data) 8 DCD (Data Carrier Detect)
3 RxD (receive data) 15 DB (transmit clock from DCE)
4 RTS (Request To Send) 17 DD (receive clock from DCE)
5 CTS (Clear To Send) 20 DTR (Data Terminal Ready)
6 DSR (Data Set Ready) 24 DA (transmit clock from DTE)
7 GND 25 VERR (-5V)
The DB, DD, and DA signals are not used with ordinary asynchronous equipment
such as most modems and terminals, printers, etc.).
The pinout of the SCSI connector is:
1 GND 17 GND 34 GND
2 data bus 0 18 data parity 35 GND
3 GND 19 GND 36 busy
4 data bus 1 20 GND 37 GND
5 GND 21 GND 38 acknowledge
6 data bus 2 22 GND 39 GND
7 GND 23 GND 40 reset
8 data bus 3 24 GND 41 GND
9 GND 25 GND??? 42 message
10 data bus 4 26 TERMPWR 43 GND
11 GND 27 GND 44 select
12 data bus 5 28 GND 45 GND
13 GND 29 GND 46 command/data
14 data bus 6 30 GND 47 GND
15 GND 31 GND 48 request
16 data bus 7 32 attention 49 GND
33 GND 50 input/output
and the pattern of the pins is:
49 46 43 .... 19 16 13 10 7 4 1
48 45 42 .... 18 15 12 9 6 3
50 47 44 41 .... 17 14 11 8 5 2
Memory is in the form of up to 16 256K SIMMs (501-1349), installed in groups
of four starting with the SIMM slots nearest the back of the motherboard and
moving forward, followed by up to 8 1M SIMMs (501-1346). The amount of
memory seen is controlled by part of J800.
There is one jumper block and various points of interest. All locations are
given with component side up and connector side toward you.
J800 (toward far left corner, pin 1 at left)
1-2 jump for 8M RAM (or less?) installed
3-4 jump for more than 8M RAM installed
5-6 unused
7-8 unused
9-10 unused
11-12 unused
13-14 jump for AUI Ethernet, unjump for thin Ethernet/autoselect
15-16 unused
Additional features of interest: the Ethernet fuse is in the far left corner
by the 3V battery. The IDPROM is at location U224 (grid I20) in the leftish
middle. The boot PROM is at location U300 (grid K8) on the left side in the
middle. The 8530 UARTs are also on the left side, toward the near end from
the boot PROM. The keyboard fuse is in the near left corner by the keyboard
connectorat grid K1. The P4A connector is on the right side near the middle
bar.
Note that boot PROM version 1.6 is required to boot from a QIC-24 tape (?).
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Last modified: 2000.10.29.14.46.44 CST
Server time: 2008.12.06.05.26.35 GMT