!!!OLD!!! ZCPU Documentation

[Black Phoenix]

Comitted IRET fix, commited JMPF fix

CPU calls them with current CS. IRET does not restore old CS (interrupt does not change it). I might change this, I'll think (to absolute address). There is chance that it won't be changed - you have to setup local interrupt table for current CS, and probably just put callf's to global interrupt table you made before.

Yeah, DS is default segment. Interrupts again, dont do this.

[Fizyk]

I did the SVN update, it updated two CPU files to rev. 660, but I still experience both issues (with iret and jmpf).

Thanks for the answers to my questions.

[quantumdude]

Great stuff, Black!
One problem though, everytime I upload a program that uses the IO ports, the CPU stops with Error:10. I've connected a Data Port to the IOBus of the CPU, but I'm still getting the error.

[-=Fox=-]

Does the program use something like:

in eax,port0

OR

in eax,1

The program might not be using ports correctly, so be sure to double check it ^_^

OH!

Does anyone know of a good memory position to use for scratch space, so I don't overwrite my program or interfere with stacks? (should I use the 32KB mark or can I use something like the 5KB mark?)

[Black Phoenix]

You can use 16384...49151 (program and stack get 16KB, data gets 32KB). Or you know... just use external RAM...

[Black Phoenix]

bump with content

[Bean]

I'm a bit confused, memory starts at 0 and code+stack is the first 0-16384, after that it's free for use?
Up to 49151? Why not 65355?

[Black Phoenix]

I'm a bit confused, memory starts at 0 and code+stack is the first 0-16384, after that it's free for use?
Up to 49151? Why not 65355?

I just suggested the way of using memory, you can use it as you wish. By default stack, code, and data reside in same 64KB of RAM (except in different ends)

[CCFreak2K]

You can put your stack anywhere you want; before you use the stack, set EBP and ESP to the highest point of memory that you want the stack to be (since it "grows down", i.e. ESP is decreased on each push).

[quantumdude]

Does the program use something like:

in eax,port0

OR

in eax,1

The program might not be using ports correctly, so be sure to double check it ^_^

OH!

Does anyone know of a good memory position to use for scratch space, so I don't overwrite my program or interfere with stacks? (should I use the 32KB mark or can I use something like the 5KB mark?)

HELLO!!!

I forgot you can use 'in' and 'out'...
However, afer rereading the documentation, it seems like I should be able to use port###...
Even the expample elev.txt fails...