Hehe good name

I am going to do as you did and connect an old c64 keyboard to my 65c02, will most probably look at your code to get some inspiration

Looks really nice

How did you do the board? 3d printer?

Doh, I sould have looked closer at the picture Saw the wood parts now!

/jan

Will be interesting to see later on what I will regret regarding design decisions on the other hand being in the sandbox is the fun part since you can not do any and everything you want with an 8-bit computer, for that I have my Visual Studio where the .suo file (SolutionUserOptions) is about 175KB ...

1MHz is plenty fast for some applications. In fact, my first commercial computer design (approximately 1986) ran a 65c02 at 170kHz most of the time (to save battery power), and kicked the clock speed up to 1MHz only for brief times for chains of floating-point calculations. The whole computer only ...

First, welcome to the the forum!

Seems your basic memory map is fine, but you are allocating 2KB of addressing to your I/O devices. Any particular reason for something this large? What I/O devices are you planning on using once you get the board up and running? My small CPU board has 8-I/O ...

Actually, what you want is 74HC or 74AC logic, not 74HCT. 74HCT logic is only necessary if you have NMOS devices driving CMOS devices, which you say you don't have. In the otherwise same device, 74xCT will be slower than 74xC.

Assuming proper construction methods and a reasonable design, 74HC ...

Ah, good to know.... however, if your W65C51 is the most recent part, there is a bug with the chip. The Xmit register bit in the status register is stuck on, so you can't use it to determine when the Xmit register is empty. You'll need to use a delay routine based on the baud rate between sending ...

Hi,

I should have written that I have the w65c02 processor and also the w65c22 and the w65c51 :)

Yep I guess the hardest part is to accept that the project will need a couple of iterations before it is "perfect" and since the memorymap is something I can fiddle with on the bus to and from work it ...

64KB of memory space is absolutely huge for a beginner to fill; so I'd say you're not in any danger of running short. Fine-grained address-decoding schemes will however usually require greater logic delays, reducing your maximum operating speed. It will also take more board space (unless you use ...

First, welcome to the the forum!

Seems your basic memory map is fine, but you are allocating 2KB of addressing to your I/O devices. Any particular reason for something this large? What I/O devices are you planning on using once you get the board up and running? My small CPU board has 8-I/O ...

Hi,

first post here after a lot of reading. First of all I would like to thank all of you for all information on this site. I have read to many articles and forum posts to remember them all but thank you all!

I got bitten by the 6502 bug about 2 months ago and have recently been able to do a sort ...