Should post that in a link so that everyone doesnt have to redesign that part for their library.

I purchased some of the older 5v units. Although I hear the w65c816 will work down to 3.3v. I would prefer to keep the levels a little higher.

So after a long hiatus, I have gotten back to some good ole 65x magic. Under suggestion of others I decided to make the leap to programmable logic. I have been using Xilinx ISE and its a bit different but it seems straight forward enough. I thought I would post this CPLD and tell me if im going in ...

Thanks Daryl that is perfect. I dont really care how long it takes for the data to get in there. It would be nice to not have to pull the chip out to update the firmware. especially when your tweaking things a lot.

I meant Nano Seconds, Certainly not Mano seconds :) Fat fingers on the keyboard.
So the typical method your saying is to make a routine that basically counts a few clock cycles between each write of data or verifies each bit of data going into the eeprom.

Makes sense, I was just thinking of using ...

So what is the correct way to design your system to be able to program to an eeprom in circuit? All the ones I see have really slow access times ie 28c16's with 90ms access times.

Thanks!

I got a Gameduino board a few weeks ago and its pretty impressive so far. the arduino library for it is GPL. Since you might use this with a 6502 processor would not use the arduino library.

Since its a BSD license you can sell your derivative work IE hardware without any issues. other than a ...

I think its a worthy project. Sure a lot of guys like the sound of their steel guitars. But I for one am always interested in other options. I dont have much issue with the possibility of a better mousetrap.
I like the idea of having a straight up 816 compiler.

I also would like to know if your ...

I have been getting a good supply of GAL devices 22v10 (and 16v8) types from Jameco.com. They seem to carry some handy parts for the hobbyist.

As far as the atmel wincupl it is "quirky" has anyone tried the software from logical devices? I have been considering purchase of it.

I think I speak for most of us here, Cant wait!

I just purchased a Rigol DS1052E (about a month ago) and am Extremely happy with it, Being a digital scope it can record the signals so you can freeze them. small lightweight and wasn't too expensive. I still have a BK 2120 dual trace but haven't even turned it on since I got the Rigol. Granted it ...

you could always try this to test the board

http://6502.org/mini-projects/nop-gen/nop-gen.htm

So I thought I would throw together a real schematic and while I was at it thought why not a 816 CPU,
Pretty Much A straight Copy of the original but easier to read what goes where without having to look across 3 graphic images. I changed the frequency a bit, should run 2Mhz. 1Mhz restored by ...

That makes sense.. 6850's are a rare critter. anyone using something else instead? 6551?


You are right about the 307kHz signal for the ACIA. Divided by 16, this gives a 19200 baud rate.

Unfortunately, if you clock the CPU at 8MHz, it expects everything else to work at 8MHz. You can use the RDY ...

This is an interesting project, I was looking at the clock circuit and was wondering if someone could explain why he takes 8Mhz to 1Mhz instead of just a 1Mhz xtal ? What purpose does it serve? I haven't looked at the ASIC datasheet to figure out why its being fed a 307Khz signal, I am guessing for ...