Where to find BASIC COMMAND status in ASM?

[Marius]

Basic:

 

Status #1,A

 

A = represents the 'state' in a decimal value of IOCB device

 

How do I get "A" in ASM? Is this already stored somewhere after a JSR CIOV/SIOV?

 

Thanks

Marius

[Marius]

Basic:

 

Status #1,A

 

A = represents the 'state' in a decimal value of IOCB device

 

How do I get "A" in ASM? Is this already stored somewhere after a JSR CIOV/SIOV?

 

Thanks

Marius

 

Is this perhaps the CIO command #$0D?

 

Setting IOCB vars right, iccom=$0d

[+JAC!]

Hi,

Every CIO call returns the status in the Y register. Also LDA ICSTA,X ($342,x) should contain the value for x=$00/$10/$20...

[Marius]

Ok let's be more specific

 

When you do the Status command on the R: device, you can read the amount of bytes in the buffer in 747 and 748 (decimal).

 

I need that info, so I guess i have to do a CIO command #$0d?

 

R: programming is rather complex (for me)...

 

Thanks

M.

[+JAC!]

First: ICSTA = $343 not $342

Second: Yes you are right. The command $0d = ICSTAT = GET STATUS is something different.

The equivalent of STATUS #1,A is

 

ldx #$10 ; Channel 1

lda #ICSTAT ;$0d

jsr ciov

bmi error

lda ICSTA,x ;$343

a=Status of the device

 

error:

y=Error code of the CIO operation

 

This is what CIO defines or all devices. But all device drivers, like R:, may of course extend the list of supported commands and parameters.

For specifically for R:, I don't now more..

[Rybags]

Any SIO Status >= 128 returned to Basic in a CIO operation will generate en ERROR.

 

So you can just use TRAP to catch extraordinary events.

 

IIRC, CIO status is set to 2 by some device handlers when the byte received is the last one before EOF - in that case, TRAP won't work for you, but checking the IOCB yourself should.