--- the pickle <[EMAIL PROTECTED]> wrote:
> At 18:57 -0700 on 18/09/01, Alex Allee wrote:
>
> >>At 12:20 -0700 on 18/09/01, Gregg Eshelman wrote:
> >>
> >>>is printed a notice for owners of the SE, Classic
> >>
> >>I wanna know how the **** Daystar got a Classic to
> take any sort of adapter
> >>card at all.
> >
> >Well, it'd either go in the RAM expansion board
> slot (quite a feat)
>
> No kidding.
>
> >or it involves some major logic board surgery.
> (assuming Classic's
> >ROM is soldered down, it is, isn't it?)
>
> IIRC, yes.
>
> I suppose they could have done it like the RasterOps
> and Radius Classic
> video cards - a clip over the CPU - but I wouldn't
> think that would work
> for an 030, which has a lot more data lines than the
> 68000 does.
There were clip over CPU upgrades for PCs to bump up
from a 386SX to 486 or 486SX to 486DX. Those CPUs
are usually surface mounted and the 486SX has more
pins around it than the 030 does in its "J" lead
package. (Same type of package can be surface
mounted or used in a PLCC socket.) How that worked is
the x86 SX CPUs have a "float" pin that when pulled
high (or was it low?) shut the chip down and
"disconnected" it from all the other pins.
The float pin was originally intended for use in
low power sleep mode for portables. Intel used it
on the 486SX so that a "487DX" (actually a full
486 with a slightly different pinout) could take
over from the soldered on SX CPU.
Any idea if any variety of 68000 or other 68k CPU
has a float pin?
=====
"The earth swarms with inhabitants. Why then should nature,
which is fruitful to an excess here, be so very barren in
the rest of the planets?" Bernard de Fontenelle, 1686
[EMAIL PROTECTED]
My ICQ# 16024947
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