I'm not sure what PAL/GALs are but since you mention a programmer it makes me wonder, could I use a PIC Chip to decode?
Currently I am looking for any option.

I only have two options so far, the 3 to 8 decoder and a series of NAND gates. I may be doing it all wrong but as far as I can tell, if I ...

Thanks for that, I am starting to get a nice list of reference books to aquire, the only problem is that there is a distinct lack of used book stores here...actually, come to think of it, we only have book store here! and it is all new stuff, rows of shiny and expensive ones!
However, having just ...

Hi,
I have a question about Address Decoding, what is the best way?
I was under the impression that a simple 3-to-8 line decoder chip tied to A13, A14 and A15 woulld suffice. (from: http://www.geocities.com/SiliconValley/2072/6prj1pic.htm) I have now been informed that, this method is prone to ...

Garth,
I have been playing with your code a bit. Would this work?


LDA $00 ; Load 00h into accumulator
STA $8002 ; Store it in Data direction register 0 of 6522 making all inputs
LDA #FF ; Load FFh into accumulator
STA $8003 ; Store it in Data direction register 1 of 6522 making all outputs ...

Paul,
I did consider using EEPROMs, especially for some kind of storage system. But unfortunately, every EEPROM I find is Serial EEPROM and that is not what I want...all the PROM types that I do want (non serial ones, parallel?) are EPROMs.
I live in the UK and the only suppliers I know of are ...

Hi,
My name is Daniel and I am trying to build a 6502 based sbc. I seem to be (theoreticly) doing rather well with the hardware. But I have a problem and that is that I haven't got any idea how to program it!

(note: I like to use theories, I won't actually do something unless it is theoreticly ...