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SGI Developer Toolbox 6.1
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SGI Developer Toolbox 6.1 - Disc 4.iso
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HDW.faq
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1994-08-01
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a Frequently Asked Questions README for our Hardware-oriented Developers
1. Where do I find information about serial port pinouts?
Find this information in the 'serial' manual page.
Type "man serial".
2. Where do I find information about keyboard interface pinouts?
Find this information in the 'keyboard' manual page.
Type "man keyboard".
3. Where do I find information about mouse interface pinouts?
Find this information in the 'keyboard' manual page.
Type "man keyboard".
4. Are the user defined pins on P2 available in the VME slots on
SGI machines?
Yes, those slots defined as "VME" slots comply with
the P2 connections of the VME spec.
5. What connections are there on the P3 connector of the 9U VME slots?
The connections are as follows:
Pins Signal
-------- --------
Row A - 1 - 25 Vcc (+5 Volts)
26, 27 +12 Volts
28, 29 -12 Volts
30, 32 Vee
Row B - 1 - 32 No Connection
Row C - 1 - 25 Ground
26, 27 +12 Volts
28, 29 -12 Volts
30, 32 Vee
6. What's the power budget for a 9U VME card slot?
The system's power supply is designed with the idea that
no single 9U VME slot will pull more than 50 Watts of
power. This limit is based on the premise that all
available VME slots are used in a maximally configured
system (maximum amount of memory, bitplanes, etc.).
It is easy to design a board that exceeds this limit
on a 9U board. The overall system's power budget must
be kept in mind.
7. Where do I find information about the VME address and Kernel
address spaces for VME based systems?
The "IRIX Device Driver Programming Guide" has this
information in Appendix A - "System Specific Issues".
This manual is available as "M4-DVDR-2.0" in the SGI
price book.
Also, look in the file "/usr/sysgen/system" on any
machine to see some of the same information.
8. What kind of SCSI connectors are used?
Currently, all SCSI connections use the "Centronics"-style
50 pin connector. Some future systems will have the more
space efficient high-density (sometimes referred to as
"SCSI-2") connector.
9. Is there a document to help in writing device drivers for SGI
machines?
Yes, the "IRIX Device Driver Programming Guide" is
available and has information on writing user and kernel
level drivers for both SCSI and VME devices. Future
versions of this document will have information on
drivers for GIO and EISA bus devices.
10. What's different about the SGI CD-ROM drive?
Two things. The drive comes up configured for 512 bytes
per sector rather than the more common 2048 bytes per
sector used on most CD-ROMS. This makes the CD-ROM
look like a disk drive at boot time allowing the O/S to
use the efs filesystem on our distribution CD's to bring
up the system.
Secondly, there is special firmware that allows audio
data from an audio CD to be transferred over the SCSI
bus to the system.
11. What are the pinouts of the 13W3 connector on the Indigo and
Crimson machines?
Here's the wiring list:
J1-A1 RED
J1-A2 GRN
J1-A3 BLU
J1-1 N.C.
J1-2 Mon.type 0
J1-3 Composite Sync
J1-4 Horizontal Drive
J1-5 Vertical Drive
J1-6 Mon.type 1
J1-7 Mon.type 2
J1-8 Digital Ground
J1-9 Digital Ground
J1-10 Digital Ground
Below is a "map" of the pin locations (as seen from the back
of the machine).
A1 1 2 3 4 5 A2 A3
----------------------------
/ o o o o o \
\ O O O /
\ o o o o o /
-------------------------
6 7 8 9 10
12. What are the video output specs for the Indigo?
The specs are different depending on what graphics configuration
you are running. This boils down to a 1024x768 or 1280x1024
question.
Graphics Configuration
Starter XS, XS24, Elan
(1024x768) (1280x1024)
----------- --------------
Pixel Clock 64 MHz +/- .005% 107.352 MHz +/- .005%
Horizontal Freq 48.48 KHz 63.9 KHz
Horizontal Blanking 4.609 usec 3.726 usec
Front Porch 1.172 usec 0.279 usec
Sync Pulse 1.250 usec 1.118 usec
Back Porch 2.1875 usec 2.329 usec
Vertical Blanking 922.5 usec 642 usec
Front Porch 61.5 usec 47 usec
Sync Pulse 61.5 usec 47 usec
Back Porch 799.5 usec 548 usec
Visible Lines 768 1024
Total Lines 813 1065
Frame Rate 59.64 Hz 60.00 Hz
13. Are the pinouts of the 15 pin high density Sub-D on the Starter
Graphics of the Indigo the same as a PC's VGA/Super VGA?
Yes.