Re: another mystery card?

[Eric Smith <eric-no-spam-for-me@brouhaha.com>]

Richard Kilpatrick <delorean@NOSPAMbtconnect.com> writes:
> That card is strange. Is that a 68020 under the sticker?

No.  The 68020 was not available in a PLCC package, and in any case
has at least 114 pins (depending on package), while the chip in the
photo has 68.

It appears to be an FPGA, probably a Xilinx part.  Perhaps an XC2018
or XC3030.  I can't quite make out the whole part number of the 8-pin DIP
in the upper right corner, but it looks like a 17Csomething, which is
a configuration PROM for an FPGA.

The card has a 12.5 Mhz oscillator, but rather than using a 12.5 MHz
68881, it has a 16 MHz part.  Possibly the FPGA isn't fast enough to allow
16 MHz operation?

I have no idea what the other 8-pin DIP is, but the 74HCT245 near the
edge fingers is obviously an 8-bit bidirectional buffer, probably used
for the data bus.

> Looks like an Apple
> II card, but what for... It's not a Mac card as someone else suggested, even
> though it clearly has a 68K series FPU on it.
> 
> I'd guess it's either nothing to do with Apples, or a 680x0 co-processor of
> a very limited type. It doesn't have enough address lines to do anything
> useful, surely?

Just a floating point card for the Apple II.  No 68K main CPU on it.