Re: Apple ][ using PC floppy

[vladitx <vladitx@nucleusys.com>]

On Dec 29, 12:18 am, Steven Hirsch <snhir...@gmail.com> wrote:

> You can count me in for at least one of these boards.  In the interim, I'd
> like to try fitting it to a Xilinx Spartan 3 starter board.  The FPGA is
> perhaps complete overkill, but I have it front of me and am getting reasonably
> familiar with the development tools.

Yes, it is overkill but who cares for R&D. :-)
It needs about 50 FFs and a heap of logic which I haven't synthesized
for LUTs.

> Do you have this in synthesizable VHDL (preferred) or Verilog?  Or, is it just
>   a handful of logic equations at this point?

Verilog, but you can translate in VHDL for half an hour probably.

Your main problem will be the logic levels - Spartan3 is a 3.3V device
and is not 5V tolerant. And there are no level-shifters on the Starter
board.