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501-1686
4/6xx motherboard VME 0M
Up to two Mbus modules. 20MHz SBus.
From left to right, with the component side up and the connector side toward
you (normal top edge at the left), the rear edge of the board has: eleven
LEDs (bit 0 to the right/bottom); a switch to toggle between Normal and
Diagnostic modes; a "scan" button; two serial ports (A and B from left to
right (top/bottom)); a keyboard/mouse connector; an audio connector; an
Ethernet connector; and a 50-pin SCSI-2 connector.
Memory consists of up to thirty-two 4M (501-1739) or 16M (501-2060) x 9 80ns
30-pin SIMMs in two banks of 16 each. Bank 0 is on the left (starts with
U1107, ends with U1401), bank 1 is on the right (starts with U1108, ends with
U1402). Banks cannot be partially filled. The chart in the FE manual looks
like this, for whatever it's worth:
Bank 0 Bank 1
U???? LO/HI U???? LO/HI bits
near ----- ----- ----- ----- ----
VME U1401 7L1 U1402 7H1 56-63
U1201 7L0 U1202 7H0 56-63
U1403 6L1 U1404 6H1 48-55
U1203 6L0 U1204 6H0 48-55
U1405 5L1 U1406 5H1 40-47
U1205 5L0 U1206 5H0 40-47
U1407 4L1 U1408 4H1 32-39
U1207 4L0 U1208 4H0 32-39
U1301 3L1 U1302 3H1 24-31
U1101 3L0 U1102 3H0 24-31
U1303 2L1 U1304 2H1 16-23
U1103 2L0 U1104 2H0 16-23
U1305 1L1 U1306 1H1 8-15
U1105 1L0 U1106 1H0 8-15
near U1307 0L1 U1308 0H1 0-7
SBus U1107 0L0 U1108 0H0 0-7
^
| xx0 = LO byte, xx1 = HI byte
There are a variety of jumpers. Locations below are given with component side
up and connector edge toward you.
J1701 (single jumper in far left)
Jump to enable internal VME arbiter JUMPED
J1702 (single jumper in far leftish)
Jump to enable internal VME arbiter JUMPED
J1703 (single jumper in far middle)
Jump to enable internal VME arbiter JUMPED
J1704 (single jumper in far rightish)
Jump to enable internal VME arbiter JUMPED
J1705 (single jumper in middle)
Jump to disable internal VME arbiter UNJUMPED
J1706 (3-pin jumper in leftish far edge, pin 1 nearest)
1-2 Connect P1.SYSRST to VME.RST.IN
2-3 Connect VME.RST.OUT to P1.SYSRST JUMPED
J1801 (block in far right corner, pin 1 to left)
1-2 Enable VME IRQ7 JUMPED
3-4 Enable VME IRQ6 JUMPED
5-6 Enable VME IRQ5 JUMPED
7-8 Enable VME IRQ4 JUMPED
9-10 Enable VME IRQ3 JUMPED
11-12 Enable VME IRQ2 JUMPED
13-14 Enable VME IRQ1 JUMPED
15-16 unused
J1802 (single jumper in rightish far edge)
Jump to enable 16MHz clock JUMPED
J1803 (single jumper in far left corner)
Jump to enable VME slot-1 functionality JUMPED
J2202 (single jumper in near right corner)
Jump to enable 25MHz ESP-236 clock JUMPED
J2602 (3-pin jumper in middle near edge, pin 1 nearest)
1-2 mouse TD grounded JUMPED
2-3 mouse TD enabled
J2603 (single jumper in nearish middle)
Jump to enable 19MHz SCC clock JUMPED
J2803 (3-pin jumper in nearish middle, pin 1 nearest)
1-2 RS-232 (-12V) JUMPED
2-3 RS-423
J2804 (3-pin jumper in nearish middle, pin 1 nearest)
1-2 RS-232 (+12V) JUMPED
2-3 RS-423
J3201 (single jumper in middle)
Jump to enable 80MHz clock JUMPED
Additional features of interest: the boot PROMs are in the near left corner at
locations U3001, U3002, U3004, and U3003 (clockwise from far right). The
NVRAM chip is in the middle, at location U2701. The serial ports A and B
fuses (F2801/F2802) are along the near edge by serial port B. The keyboard
fuse F2601 is by the keyboard connector, the Ethernet fuse F2301 is by the
Ethernet connector, and the SCSI fuse F2201 is by the SCSI connector.
Note that boot PROM version 2.8v2 or later is required to use SM41 modules.
Boot PROM version 2.10 or later is required to use SM51, SM520, or SM521
modules.
Power requirements (with 0M and no Mbus modules) are +5V @ 14.27A.
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Last modified: 2000.12.07.21.57.01 CST
Server time: 2012.02.05.00.25.52 GMT