I guess I should have wrote my reply better. Yeah its one cycle for the fetch for the opcode, since the value is directly in memory, it should take an additional 3 to obtain the 16bit address of the operand(the second and thrid cycles since memory is addressed in bytes), and then get the operand ...

Ok that makes alot more sense, thanks guys. I didnt know it took 4 cycles for a fetch, but then again, it is a 8 bit data bus. I've been working with a 32bit design for another processor the IR was big so the fetch from memory only needed to be done once. Now I can go back to designing my 8-bit ...

I'm a little confused about how the 6502 handles an instruction fetch. It seems to use 3 bytes, to do a direct addressing instruction. The first byte fetched should the opcode, and the next location in memory is the address of where the operand is.

Now in a more detailed approach the PCs value is ...

Well 32bit addressing at least. The data is 16bit, so I guess you can call this a 16 bit processor then. It would have been nice if it had 32bit data tho.

Are there any datasheets on the W65T32 version of the 65xx series? I just recently saw, this on WDC's site, but I dont see any data sheets on it.

Sorry for being idle for so long, work and school seem monopolize on my free time these days. I'm going to give this board house a go, since I just finshed up routing and FPGA board(took a while but it should work although its 2 layer). Now for a 6502 board that wouldent be much of a problem given ...

Was looking on the RC group asking about power requirements and I found this on a thread when I was browsing. http://www.sparkfun.com/shop/index.php?shop=1&cart=175696&cat=86&

Really neat, 2.50 a square inch for a pbc, I am sure theres probably a "string" atached, then again I could be wrong. Any ...

You know I always liked Lee Davidsons' IDE setup, my only problem is that I couldent find the GAL chip that was in the schematic, that could be one way to interface with an IDE device. The rest of the setup is mostly TTL chips and and IDE connector and a connector to the 6502.

I just finished my prototype for displaying text on a 320x240 LCD display.


I bought the Optrex display from a local surplus store (they still have some left) and the power supply from jameco.com I don't think jameco sell it anymore but I did see it on a couple of other surplus sites.



Daryl ...

http://www.freedos.org/
That might be a good place to look.

That stuff is hard to do, but if you can pull it off just right it can be done

SMT is hard to solder, i like PLCC my self for some reason.

What features is your 'SBC 3' going to have?

I wish WDC made some other 65xx chips as well like the 6520 and 6526

Nice aritcle Daryl.