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501-1205
3/60 motherboard 4M with mono
20MHz 68020, 20MHz 68881 floating point chip, Sun-3 MMU with eight hardware
contexts, up to 24M 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); a female D50 SCSI port connector; and a female DB9
monochrome video connector (for those models with a monochrome framebuffer).
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
Note that pin 26 (TERMPWR) is connected to ground on part numbers 501-1205-09
or lower, 501-1322-01, 501-1334-01, and 501-1345-01. This can cause a short
if another device in the chain is providing termination power!
The monochrome video output levels are ECL/TTL. The output can be switched
between low resolution (1152 x 900 61.8KHz horizontal sync, 66Hz vertical
sync) and high resolution (1600 x 1280) via a jumper in J800. The pinout of
the monochrome video connector is:
1 VIDEO+ 6 VIDEO-
3 HSYNC 7 GND
4 VSYNC 8 GND
9 GND
Memory is in the form of up to 24 1Mx9 SIMMs, rated 100ns or faster, installed
in groups of four starting with the SIMM slots nearest the back of the
motherboard and moving forward. These SIMMs are part number 501-1239 and are
the same kind used in IBM PC clones. Note that some users have experienced
problems with three-chip SIMMs (as opposed to nine-chip SIMMs) -- see Misc
Q&A #17. 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 4M RAM or more installed
3-4 jump for 8M RAM or more installed
5-6 jump for 12M RAM or more installed
7-8 jump for 16M RAM or more installed
9-10 jump for 20M RAM or more installed
11-12 jump for 24M RAM or more installed
13-14 jump for AUI Ethernet, unjump for thin Ethernet/autoselect
15-16 jump for high resolution video, unjump for normal
resolution/autoselect. Note that the video cable must be 530-1539 or
530-1336 and the monitor must be 540-1427 Motorola revision T or
later for autoselect to operate.
Additional features of interest: the Ethernet fuse is in the far left corner
by the 3V battery, at grid J39. 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 connector at grid K1. The P4A and P4B connectors are on the
right side on either side of the middle bar.
Note that boot PROM version 1.6 is required to boot from a QIC-24 tape. Boot
ROM version 3.0 or later is required to use the P4 cgsix color framebuffer
(501-1374/1505/1532) as the console.
Power requirements are +5V @ 11/13.5A typical/max, -5.2V @ 0.3/0.5A
typical/max, and +12V @ 0.3/0.5A typical/max. (The FE manual lists +5V @
10.1A for models with framebuffers and 8.9A without, -5V @ 0.7A for models
with framebuffers and 0.3A without, and doesn't list +12V at all.)
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Last modified: 2000.10.28.15.11.24 CDT
Server time: 2008.12.06.05.24.06 GMT