[coco] A couple of PC hardware questions

[jdaggett at gate.net]

Ray

What I know about the TAX supply can be put in a thimbal but here 
goes.

The supply is different from the AT supply in that it can be remotely 
turned off via software control. There is some newer features that 
has to do with some of the very high end gaming video cards that 
need special power lead of their own and can not be suppplied from 
the PCboard and the PCI/AGP connector. 

As for the keyboard, both are serial and outside the connector there 
only minor differences between them. Mostly in initialization and the 
amount of key codes that has to be deciphered from the keyboard 
driver routine in the OS. 

james

On 16 Jan 2004 at 14:34, Ray Watts wrote:

> 
> Mark, That REALLY deserves a WOW! Note that I still have not received
> any replies except for your bit on the internal ZIP drives.
> 
> Cheers, Griz
> 
> 
> mmarlett at isd.net wrote:
>     Ray,
> 
>     The WOW was for a VERY rare on topic post to the CoCo malted
>     list...... That was all.....
> 
>     :)
> 
>     Mark
> 
> 
>     I'm not sure what the WOW! is for, Mark.  You did see the Grizzly
>     CoCo at Pittsburgh.  However, I forgot to mention two other
>     additions crowded into the CoCo chassis;  your AT keyboard
>     interface and a 128k printer buffer.  The buffer was added when I
>     bought one the size of a coughdrop box and stripped the PCB out of
>     it.  I discovered it didn't require the 9V external PS because the
>     9v went directly to a 5V regulator.  Just removed the regulator,
>     hooked the PCB to the 65W supply and mounted it along with
>     everything else where the keyboard was removed.
> 
>     Mark Marlette wrote:
> 
> 
>     At 07:08 PM 1/15/2004 -0800, you wrote:
> 
>     Ray,
> 
>     WOW! On on topic post....I believe that is correct on the internal
>     ZIP. Never had one...Internals I go to EZ135, faster than a
>     ZIP100. Hard to beat a ZIP external.
> 
>     Mark
>     Cloud-9
> 
> 
>     1.  What is the difference between an AT and an ATX power supply? 
>     I note that the specs for an ATX show a +5V VSB lead.  How is that
>     used?
> 
>     2. Does a PS/2 keyboard operate identically to an AT keyboard
>     (except for the connector size)?
> 
>     The reason I ask is that the latest JAMECO catalog has a 150W ATX
>     PS (though a litttle pricey) that will slide easily into the space
>     left by pulling the transformer and voltage regulator heat sink. 
>     This will allow one to install a superboard, a SCSI controller, a
>     floppy controller (both on a Y-cable), a couple of 3.5" floppy
>     drives, a SCSI HD and an internal SCSI ZIPdrive all into a CoCo
>     chassis.  Then, all you have to do is build a polystyrene
>     backplane and cover.  Essentially, this is what I did on the
>     Grizzly CoCo except I only had a 65W PS so I had to go with an
>     external ZIP.  And, of course, Disto 2-meg and 3 in 1 boards in
>     place of the superboard.  I was able to obtain several internal
>     ZIP's to use for this purpose.  One advantage to internal ZIP's is
>     (correct me if I'm wrong, Mark) you are not restricted to using
>     /h5 and /h6.
> 
>     JAMECO also has PS/2 keyboards (also a little pricey)  in place of
>     those windows monstrosities flooding the market.
> 
>     Thanks,    Griz
> 
> 
> 
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> 
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