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501-1075
3/50 motherboard w/o FPU 15.7MHz 68020, a socket for a 68881 floating point
chip (at 15.7MHz), Sun-3 MMU with eight hardware contexts, 4M of onboard
memory. No bus interfaces.
From left to right, the back edge of the board has: a female DB15
keyboard/mouse connector; eight LEDs (bit 0 to the left); 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 A
and B from left to right); a female D50 SCSI port connector; and a female DB9
monochrome video connector.
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
left to right, as it appears on the LEDs.
Pattern Status Error
-------- ------ -----
11111111 Resetting CPU or PROMs bad
00000000 Test 0: CPU to SCC path CPU board (SCC) bad
10000000 Test 1: boot PROM Boot PROM bad
11000000 Test 3: context register CPU board (MMU) bad
00100000 Test 4: segment map RAM rd/wr CPU board (MMU) bad
10100000 Test 5: segment map RAM CPU board (MMU) bad
01100000 Test 6: page map RAM CPU board (MMU) bad
11100000 Test 7: memory data path CPU board bad
00010000 Test 8: bus error detection CPU board bad
10010000 Test 9: interrupt capability CPU board bad
01010000 Test 10: MMU read access CPU board bad
11010000 Test 11: MMU write access CPU board bad
00110000 Test 12: write to invalid page CPU board bad
10110000 Test 13: write to protected pg CPU board bad
01110000 Test 14: parity error check CPU board bad
11110000 Test 15: parity error check CPU board bad
00001000 Test 16: memory tests CPU board bad
00000001 Self-tests have found an error See below
00000010 An exception class error found See below
"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. Pattern 11111111 may also mean that a SCSI
device was powered up prior to the CPU being powered up. If LED 7 (00000001)
lights up while the tests are being performed, it indicates that the test
failed. If LED 6 (00000010) lights up while 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 (00000100) 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"
(labelled "BOOT" on some early versions). 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.
Jumper J0642 and switch S0618 relate to Ethernet. The pinout of the AUI
Ethernet connector is:
2 E.COL+ 9 E.COL-
3 E.TxD+ 10 E.TxD-
5 E.RxD+ 12 E.RxD-
6 GND 13 +12V
The serial ports conform to both RS-232-C and RS-423 and are wired DTE. The
documented maximum speeds are 19200 bps for output and 9600 bps for input.
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 ??? 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
The monochrome video output levels are ECL/TTL, with a resolution of
1152 x 900 at 62KHz horizontal sync and 66Hz vertical sync. The pinout of
the monochrome video connector is:
1 VIDEO+ 6 VIDEO-
3 HSYNC 7 GND
4 VSYNC 8 GND
9 GND
There are five jumpers/jumper blocks and one DIP switch block. All locations
are given with component side up and connector side toward you.
J0108 (forward far left corner, pin 1 at right)
1-2 jump to test the onboard 4M RAM JUMPED
3-4 jump to run "ETH SIA CAL." test UNJUMPED
5-6 jump to "SCSI on (on is active high)" UNJUMPED
7-8 jump to "DCP on (on is active high)" JUMPED
J0123 (forward far left corner, pin 1 at right)
1-2 15.7MHz clock for 68020 JUMPED
3-4 12.5MHz clock for 68020 UNJUMPED
5-6 12.5MHz clock for 68881 UNJUMPED
7-8 15.7MHz clock for 68881 JUMPED
J0642 (K4, by S0618, near AUI Ethernet connector)
1-2 jump for type-1 Ethernet transceiver, unjump for type-2
J0702 (leftish middlish, by 68881 socket and boot PROMs, pin 1 at right)
1-2 jump for 27256 PROMs UNJUMPED
3-4 jump for 26512 PROMs JUMPED
J1500 (right middlish)
1-2 jump for 100MHz video clock JUMPED
S0618 (by AUI Ethernet connector, switch 1 toward rear)
1-8 ON for thin Ethernet (BNC connector), OFF for AUI
Additional features of interest: the IDPROM is at location U0204 (grid N21),
on the left side toward the far end, by the battery. The boot PROM is at
location U0701 (grid N9), on the left side toward the near end. The keyboard
fuse F1 is near serial port B at grid F4 and the Ethernet fuse F2 is near the
SCSI port at grid E4.
Note that boot PROM version 1.8 is required to boot from a QIC-24 tape. Boot
PROM version 2.5 is required to boot from a QIC-24 tape in a Sun-2 shoebox.
Note that CPU revisions lower than 501-1075-10, 501-1162-08, and 501-1133-10
may fail under SunOS 3.3. Additionally, the 370-1011 Sysgen SC4000
SCSI/QIC-11 tape controller does not work with the 3/50 under SunOS 3.3.
Note that a bus error may occur when large executables are run during a
prefetch across a page boundary with CPU revisions lower than 501-1162-11 and
501-1207-04.
Power requirements are +5V @ 13.5A max, -5V (-5.2V?) @ 0.8A max,
and +12V @ 0.5A max.
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Last modified: 2000.10.25.20.37.01 CDT
Server time: 2008.12.06.05.21.46 GMT