FS: U17 PLAnkton, new generation PLA replacement

[e5frog]

I made a PCB and wrote some VHDL code to improve and update the PLA released at Nightfallcrew some time ago as the chip used is no longer manufactured. Since only the chip programming file was released the code had to be rewritten and improvements was added with some help of Mr Francois Leveille who checked an measured everything and was very enthusiastic about the result:

 

"It is exactly the same speed as an original Commodore 7700R1 within 2ns tolerance on all outputs."
"... works with every cartridge I could test it with - 1541 Ultimate I, Super Snapshot V4, FastLoad, Super Zaxxon (which is extremely sensitive to problems) they ALL work..."

There's no overlapping /OE and /CASRAM is properly delayed, it even has a filter that can be activated with a jumper if needed with the very first boards.

I miss the proper test equipment myself but have dumped an original PLA and the U17 PLAnkton - dumps were equal. I can guarantee the proper input/output. Apart from that I have personally only tested EF3 kernal replacement (as well as on the 1541U-II), run some modern demos from the 1541U-II, all my carts including EasyFlash, TFCIII, TFCIII+ and some simple games - all worked perfectly both on a 1983 board (250407) and one from 1986 (250466).

Here's a rendering made with Eagle3D from the EagleCAD program:

 

 

Now taking preorders, price is €11.40, which today is about US$12.51

Parts are expected to arrive within 2-3 weeks.

Please send an e-mail to: u17plankton[a with tail]gmail.com

For Australian, South- and North American customers, please e-mail to: eslapion[a with tail]videotron.ca