The "Foxy" CPU - Part 2

[Scooper]

Just 2 small things to point out in this tutorial:

For the Address Bus section:

Memory 1
Offset: 0
Size: 7

Memory 2
Offset: 8
Size: 7

Memory 3
Offset: 15
Size: 128

Shouldn't it be like this?

Memory 1
Offset: 0
Size: 7

Memory 2
Offset: 7
Size: 7

Memory 3
Offset: 14
Size: 128

You do it like this all over, except for the Memory 2 in the first example. ^_^ And the offset in Memory 3 becomes 'incorrect' when having wrong offset in Memory 2.

I figure it wouldn't create any problems doing it like in your example, it would just skip a 'Cell'.


And in the first "transfer data" example, you have this:

 mov #eax,#ebx  //transfers the byte at 5000 to 65536 first run

[Instruction TO,FROM]
Wouldn't this result in the opposite of what you're trying to do? ebx = 65536, eax = 5000. So, the byte at 65536 TO 5000.

[-=Fox=-]

Ah! Ok, I'll adjust it as soon as I can get to it.

[robertark]

Awesome guide so far

You're missing the CD Ray for high speed devices, though. I've accomplished the part of reading/writing to a CD with E2. Now its time to conquer the daunting task of doing the same thing but with ASM o,0

*sigh* This is going to take a while to soak in. Bedtime

[Jat Goodwin]

Awesome guide so far

You're missing the CD Ray for high speed devices, though. I've accomplished the part of reading/writing to a CD with E2. Now its time to conquer the daunting task of doing the same thing but with ASM o,0

*sigh* This is going to take a while to soak in. Bedtime

It's actually really easy, Very similar to writing to memory.

[robertark]

It's actually really easy, Very similar to writing to memory.

Gotchya, thanks. I accomplished reading/writing to a CD with E2. Also includes auto-track detection (Starting track/ending track number)

Thinking of releasing it to everyone shortly, once I fix minor flaws (such as adding if(first() | duped()) to some e2 chips)

Doing this in CPU might be a bit over my head, so I'm just going to give myself a for doing this in e2

[Vinkel]

A bit embarasing.. I've got troubles with the CPU again - I can't make it work with the console screen. Neither the intergrated "hello_world" or fox' example seems to be working with the console. I've wired the CPU's memBus with the console's memory, and I have attached a clk-button for both devices... It doesn't work. Any ideas?


EDIT:
And YES, I have debugged it, and I had to change a colon in fox's example. But it sill doesn't work :/

[Drunkie]

Are you resetting the CPU?

Try wiring a (Not) - Logic chip to the button and wire Reset on the CPU to the (Not) chip.
So when the button is not pressed, you reset the CPU.

[Vinkel]

Actually, that was EXACTLY what I had done Still not working...

[Drunkie]

Are you using a label? Are you jumping to the label?

Paste the code for the CPU.

[Vinkel]

It's not even my code....



Data;

Line1:
db 'Hola craps it works!',0: //the String is here

Code;

Writestring: //EBX = address to write, EAX = the db line to write, then call it.
cmp #eax,0 //check to see if we have reached end of string "0"
je Writend
mov #ebx,#eax //put the chars to console!
inc ebx //Bump Console up one cell
mov #ebx,999 //output char params
inc ebx //next console cell
inc eax //next value in the string
jmp Writestring //keep writing till we hit a 0
Writend:
ret

Main: //the above is a CALL, read the comments on how to use it.
mov ebx,65536 //Location of where to write the string to.
mov eax,Line1 //The address of where Line is located is put into eax
call Writestring //Make the call!