An Alternative to x21
- To: MISC
- Subject: An Alternative to x21
- From: Dave Lowry <lowry@xxxxxxxxxxxxxxxxx>
- Date: Wed, 17 Mar 1999 13:07:40 -0600 (CST)
Those who do not subscribe to Dr. Ting's Forth Engines
newsletter may not know that he has reverse-engineered
MuP21. He has written, in Verilog and VHDL, a 16 bit
"clone". At present, it's just the CPU, no video.
I have synthesized the VHDL version, and run it in a
Xilinx gate array at about 25 MHz. This is not too
terribly far from the real-world performance of the x21
chips running out of DRAM. Plus, the chip seems to
perform much more reliably than MuP21.
-Dave
(all opinions mine, not those of my employer, etc.)