"Peter C. Wallace" wrote:
> ajp166 wrote:
> A newer chip that can still be found is the WD37C65
> that will do 125ns easily. Or you could easily find a d765
> off an old board or NOS from JDR.
Do you know of a WD37C65 data sheet on the web?
> Allison
> I've built enough to enjoy later parts as I'm old enough to want
> it done in a lifetime and the older parts meant tons more support
> parts and the requisite connections. Of the latter, the fewer the
> better for both buildability and reliability.
Hmm what ever happened to sockets and repairable stuff.
> I guess you are not using Xilinx, but one thing I've noticed lately is the
> appearance of large, serial flash EEPROMs. We are using one on them in a
> new Xilinx design. The SST part is a 1 Mb chip (128KBytes) 8 pin SOP
> package = $1.35. So instead of Xilinx's $4.40 OTP chip we use a 8 pin PIC
> and the serial EEPROM for a total of $2.29 and get re-programmability...
A good solution but this is a one-shot project so price is not a major
problem
here. One possible option is going to quick-logic's FPGA's and the web
design
setup. I think you can get a free FPGA programed under that system for
R&D.
At the time I got my FPGA kit they did not have a Xilinx fpga kit the
size
I needed ( 800? Logic blocks ) or free Xilinx software.
--
Ben Franchuk --- Pre-historic Cpu's --
www.jetnet.ab.ca/users/bfranchuk/index.html
Received on Sun Dec 16 2001 - 23:51:35 GMT