The Rough Guide to MBus Modules
Introduction Buses Modules Systems Chips Miscellany

SPARCplug-PC

SPARCplug-Solo

SPARCplug-Station

SPARCplug-Server


Systems

The SPARCplug is a tiny workstation-on-a-board mounted in a module the same size as a full-height 5-1/4 inch disk drive.

The SPARCplug module contains a single MBus slot, on-board audio, SCSI, Ethernet, two RS-232 ports, a mini-DIN keyboard socket, a single SBus slot, and four 200-pin SIMM slots, and even a low-profile SCSI disk drive!

This module was incorporated into four retail configurations:

The standard models included either:


Overheating

The SPARCplug enclosure is miniscule, and thus you must avoid using hot MBus modules - otherwise you'll cook it.

Each configuration of MBus modules below is given one of the following "heat ratings":

RatingMeans...
deadly hot enough to kill the motherboard/module/power-supply
harmful prolonged use is likely to kill a module
safe may run hot, but not enough to damage anything

NOTE:   The above heat-ratings are normalised against an ambient air temperature of upto 30 Celcius. If the external air temperature is above 30 Celcius, you should take extra care.


Other Issues

Obviously, you will not be able to use double-width MBus modules in any SPARCplug system.

I suspect that the MBus speed is set with firmware commands, just like the HyperSTATION-30.


MBus Module Configuration Table

Module Type No. of
(identical)
Modules
Fits and Works? Minimum BootPROM Level Heat Rating
CYM6001K
SMany
HM142W-1024
HM150W-512
1 no n/a n/a
2
HMany-256
HM125S-512
HM133S-512
HM180S-512
1 yes any safe
2 no n/a n/a
HM110S-1024
HM125S-1024
HM142S-1024
1 yes any harmful??
2 no n/a n/a
HM110D-1024
HM125D-512
HM125D-1024
HM133D-512
HM150D-512
1 yes any deadly
2 no n/a n/a
HM150S-512
1 yes any just about safe
2 no n/a n/a
HM166S-512
HM180D-512
HMx4D-512
1 yes any harmful?
2 no n/a n/a
HMx4S-512 1 yes any safe
2 no n/a n/a
HMx4.5S-512 1 yes, if MBus is set to 40MHz any safe
2 no n/a n/a


Introduction Buses Modules Systems Chips Miscellany
Mike Spooner, revised 18th June 2005