No X in my XFER

[eclarkmeyer 0]

I am haveing no success writing data back and forth between the H and M memory areas using the XFER instruction. I have checked the A500 registers but there are no values written there. Any suggestions? ECM

[Jay Anthony 118]

Need more info: 1. Three operands for XFER

[eclarkmeyer 0]

N = 4 S = D500 D = H101

[Jay Anthony 118]

Anyhting else writing to H101?

[Jay Anthony 118]

Try different destination like D32000.

[eclarkmeyer 0]

@XFER N = 4 S = D532 D = D732 @XFER N = 4 S = D732 D = D532 Both work fine. ???

[Jay Anthony 118]

Something else must be writing to H101! Use View:Windows:Address Reference Tool - Search for H101.

[eclarkmeyer 0]

I can set the value in the memory view or with a MOV instruction but the XFER is just not working for the D/H word data transfer.

[Andy_P 7]

I would have to agree with Jay. Someting else must be writing to your source or destination words. There is no other reason that I can think of that would stop this from working. Is it possible that these words are being inderectly addressed? Andy.

[Guest Guest]

As far as I can tell there is nothing else writing to these particular H memory addresses. I can write the values from D to H with a MOV instruction and they do not get overwritten. I assume that if something else was writing to these addresses that they would change.

[Andy_P 7]

Check that in your XFER instruction, you are using a constant, ie '#4' or '&4' as your 'number of words' entry, and not just '4'. This would have the effect of copying a number of words corresponding to the value of IO address 4, which could possibly be any value, and maybe even 0. Andy.

[eclarkmeyer 0]

It looks like that may be my problem, I'll let you know. Thanks

[Jay Anthony 118]

Be sure to enter #4 for N; if not then you are implying CIO 4.