But what about the 816's COP vector? If WDC intended for that kind of circuit to be used, the vector wouldn't exist.

You'll find sources at http://www.gaby.de/ but if it is just a matter of translating sources, I or anyone else could have done it years ago. The way files are loaded in memory and how the memory is treaten has everything to do how a Z80 handles memory. And a 6502 isn't a Z80. CP/M 3.0 is supports ...

You have to do that as the EEPROM will not be ready for the next CPU fetch cycle and the CPU will go off into never-never land (been there, done that!).
On the 2865 (my favorite EEPROM, which I don't have!), there is a READY//BUSY line on the EEPROM. It would probably work to hook up the RDY/BSY ...

Yesterday was the first time I burned eproms since early May.
I personally prefer EEPROMs. They can easily be written in real-time (in fact, I have ideas in my head for a customizable workbench system that has a reset vector that points to $E000 that jumps to a monitor so I can easily program the ...

The Z80 and 8080 processors are 8 bits. That would make it easy to port to the 6502. If anyone could find the assembly source for CP/M for the 8080, I could probably port it.

Recently, I have been continuiosly checking the 6502.org Forum for new messages, but for at least a week I haven't been seeing any orange messages or cagegories. What's going on?

The 65816 COP instruction interfaces to a coprocessor. How can I hook up a 65816 to a coprocessor so the COP instruction will interface to it?

* Bit-banged I/O requires the aid of the computer's CPU. Unless I use a dedicated microcontroller just for the expansion backplane, there is no hope of me getting any kind of reasonable computation speed if it's constantly babysitting the bus. For example, let's pretend that we can drive our GPIB ...

Not so long ago, I was idly digging through the datasheets archive and clicked on `Rockwell'. I noticed `R65C19 Microcomputer', and from the look of the datasheet it's a R65(C)02 based MCU. Was that ever made that much?

Oops, forgot to look on the tools page...
I found a simulator but what about building 6502 based computers?

Once you learn those two things, then you're ready to basically just dive right in. There is no right or wrong way to build a 6502-based computer.

Here's some tips:


Wire your system ...

I am thinking of building a 6502-based digital clock. For the timing, I would like the timing to be done by a 6522 VIA. How do I program Timer 1 of the 6522 to tick once a second? Oh, and I don't want to use any approaches that modify PA or PB, since I'd like to hook up those to a BCD decoder.

The 6502 requires 3K pull-up resistors on /IRQ, /NMI, etc. according to my sources. However, I went to my local IC supply store and asked for 3K pull-up resistors, and the salesman didn't even know what those are, and I looked at my Jameco catalog, and it didn't say `pull-up resistors' anywhere. Can ...

How can I program the ROM of a MOS 6530?

Those words are very true. Maybe I should just forget about compactness and actually try to build something more useful.

I have an idea: a 6502 system that is only 5x5 inches. I'm thinking of using an 6510 for processor (6502 w/ built-in I/O), 6551 for serial communications (RS-232 ACIA), 6532 for RAM, I/O, timer, and 2865 as EEPROM (maybe a little monitor program built-in so I can build up the system), etc. Does ...