Hi. I'm trying to get a simple routine to print the current time in the screen, using the W65C265SXB-like computer.

My code is:



Well... the results are either:

• does nothing
• freezes the board

What am I doing wroing? This must be something of the most basic stuff that I'm missing. This is the very same SBC where the SXB hacker and ehBasic runs flawessly, so it's my wrong doing for sure.

Thanks.

I'm certainly no expert on the SXB. But certainly the stack pointer needs to get initialized at some point. Was that already done before your code gets run?

-- Jeff

_________________
In 1988 my 65C02 got six new registers and 44 new full-speed instructions!
https://laughtonelectronics.com/Arcana/ ... mmary.html

Thanks. That's my code. Everything you think is missing or wrong, is missing or wrong.

Yes. But I'm imagining what you do in order to try the code. For example, perhaps the machine monitor program produces a prompt on the console, and you somehow respond to say, "run this." In that case the monitor would already have initialized S, and there's no need for you to do it again.

(You're not burning the code into an (E)EPROM, are you? If so, then maybe the monitor won't have had a chance to initialize S.)

Did you create your code by modifying an example borrowed from elsewhere? If so, does the UN-modified example work? Have you studied the SBX doc? (I haven't, and don't presently have time.)

BTW I notice your SEP instruction partially negates what the REP accomplished.


-- Jeff

_________________
In 1988 my 65C02 got six new registers and 44 new full-speed instructions!
https://laughtonelectronics.com/Arcana/ ... mmary.html

These utility routines must be called with JSL and not JSR.

The documentation does not say that read time preserves the registers so you should reload them before the call to put_str.

_________________
Andrew Jacobs
6502 & PIC Stuff - http://www.obelisk.me.uk/
Cross-Platform 6502/65C02/65816 Macro Assembler - http://www.obelisk.me.uk/dev65/
Open Source Projects - https://github.com/andrew-jacobs

Thanks. I'm just being sure that I put the Acc and Registers in 16 bit mode, and then only the Acc in 8 bit mode.

I wrote the code by myself, and put that SEI, CLC, XCE instructions because it seems to me it's the standard way to initialize any code in the '816.



Thanks. Do that implies that Acc and Registrers should be both in 16 bit mode? Or can I JSL everywhere I'd need, no matter the data width?



I've searched for an opcode for that, and I can't find it. How do I reload the registers before calling put_str?

_________________
Andrew Jacobs
6502 & PIC Stuff - http://www.obelisk.me.uk/
Cross-Platform 6502/65C02/65816 Macro Assembler - http://www.obelisk.me.uk/dev65/
Open Source Projects - https://github.com/andrew-jacobs

Thanks. Oh! I see... it was a matter of rewriting the registers the following subroutine expected, because the previous one could have overwritten them, couldn't it?? Thanks, again.

_________________
http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?

Thanks for your help. I should be reading that "65816 programming" book from WDC instead of jumping into the pool while not being able to swim...

It seems there is something also with SEND_CR ($e066) subroutine, because if I put it like this



...to force blank line, it doesn't work at all. But If I remove them, the code works, by outputting the time running in the computer.

The Mensch monitor only outputs CR for a new line. Your terminal program needs to be configure for automatic new lines (i.e. it generates the line feed for you).

_________________
Andrew Jacobs
6502 & PIC Stuff - http://www.obelisk.me.uk/
Cross-Platform 6502/65C02/65816 Macro Assembler - http://www.obelisk.me.uk/dev65/
Open Source Projects - https://github.com/andrew-jacobs