I got a 240x64 graphic lcd running the toshiba example program that I converted to 6502.

I am using the 74HC versions when I buy new stuff. However, I have a lot of old LS chips still hanging around in boxes.

I wasn't trying to recreate the 6509. I don't have any reason to. I was just reading the post on my lunch and thought my 6510 idea was compatable so I drew it up too bad it wasn't as useful as I thought. I don't intend to use programmable logic like an FPGA in any of my projects. Just off the shelf ...

I read the entire thread on my lunch. I get hour lunches. But I will go back through it, or get back to work on my project rather than tinkering with random stuff.

well the opcodes don't look different but I didn't match every one. So there is a port at $0000 and $0001. If you replaced the 6522 in my schematic with 2x 74LS373 and used the sync to select which 373 to use it would essentially use one 373 for execution and the other 373 for memory reads and ...

Sorry, I was reading the doc on my lunch and missed the part where the $0000 and $0001 registers are different from the 6510. Is it safe to assume the 6509 has extra op codes to handle this also. Well if nothing else this topic got me to draw up my 6510 plans. Yes CS is the active low CS. I crossed ...

I use DASM for my assembler I know people don't think very highly of it but I have written a lot of 6502 code in it.
http://dasm-dillon.sourceforge.net/
runs on windows and linux.

My modular 6502 SBC uses arduino headers for the BUS for board stacking. I have my source code for the monitor ...

I've noticed a misconception in this thread. The port on the 6509 6510 is a general purpose I/O port not a memory maping port, although it can be used as such and is always at location $0000-$0001

This is a quick schematic I drew up of a 6509 6510 replacement. It is an untested theory I have but ...