Re: Very curious! New URL

[Derek Morton]

A Plus (probably works on an SE just fine) 68030 + 68882 accelerator.   
The memory on the left is to allow either greater than 4 MB memory  
expansion or perhaps faster memory access (it might also use the memory  
on the main board).  The connector on the right (two row header  
connector - possibly a PDS) would likely be for some sort of expansion  
board which might never have been used (though perhaps for a fast SCSI  
interface).  The board would have either clipped on top of the original  
processor or (possibly) required a processor socket.  If you look on  
the top right next to the header connector there is a large white  
rectangle in the silk screen.  This rectangle surrounds the pins which  
comprise the 68000 processor connections (there are four ICs in the  
center of the pins) - Note the square pin indicating pin 1 for  
orientation purposes.  The jumper in the lower right corner would  
either indicate the amount of memory on the main board or the amount of  
memory / size of the SIMMs being used on the expansion board.  The  
socket next to the '882 is most certainly a crystal oscillator and the  
jumper below it may enable/disable the local oscillator.  This board is  
remarkably similar to the DayStar Mac20MX accelerator (16 or 25 MHx  
68020 circa 1989) for the SE, Plus and 512KE...  So close in fact that  
I would guess it is a variant of it...  Although it could be a  
competitors copy.

Derek

On Saturday, August 23, 2003, at 10:14 PM, Gamba wrote:

NEW URL:
<http://home.earthlink.net/~gamba2/images/Curious2.JPG>


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