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Author Topic: Mysterious jumper A4000T motherboard  (Read 2848 times)

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Offline TjLaZer

Re: Mysterious jumper A4000T motherboard
« on: April 30, 2006, 05:00:22 AM »
It's the Sex and Free Beer jumper!  Once jumped, Haynie himself will bring over a keg and Jenna Jamison!!  ;)

"NEVER EVER mess with a PCB jumper you don't understand, even if it's labelled "SEX AND FREE BEER".
--Dave Haynie

Actually that jumper does this:

"This jumper activates a modified type of
Zorro III cycle, a thing called "early size mode". This lets a Zorro
III cycle indicate its data transfer size at address time, rather than
waiting until data time. It should be compatible with all boards that
follow the Zorro III specs. But since we couldn't test this in
advance, it was made a jumperable option. This mode is described in
the Zorro III addendum that I wrote in April '93 or so."

Dave Haynie          | ex-Commodore Engineering | Ki No Kawa Ryu Aikido
Sr. Systems Engineer |      Class of '94        |    "Life was never
Scala Inc., US R&D   |  "See us in the movie!"  | meant to be painless"
Going Bananas over AMIGAs since 1987...

Looking for Fusion Fourty PNG ROMs V3.4?

:flame: :banana: :banana: :banana:
 

Offline TjLaZer

Re: Mysterious jumper A4000T motherboard
« Reply #1 on: April 30, 2006, 05:08:53 AM »
lol
Going Bananas over AMIGAs since 1987...

Looking for Fusion Fourty PNG ROMs V3.4?

:flame: :banana: :banana: :banana: