asm issue

[DRDOS]

I am not familiar with assembler, so I hope that somebody might help me with this:

My program controls 2 PCI grafic cards. Using the asm commands:

asm {   // activate new crt-controller
  MOV AX,switch_pci
  MOV BX,mon
  MOV CX,0x0083
  MOV DI,0x0004
  INT 0x1A       
}

and
 asm {    // switch off last activated crt-controller
  MOV AX,switch_pci
  MOV BX,mon
  MOV CX,0x0000
  MOV DI,0x0004
  INT 0x1A
}

This works fine, however when I use a PC with another CPU Type (another Sockel) then this switching does not work anymore.

Does this Register commands only apply to a certain CPU type ?
Is this the problem ?

[Salem]

Lemme guess, all your 16-bit real-mode code is being run inside XP ?
Give us some specifics man, not something vague like "another machine".

[VirtualAce]

That code is just loading registers with values and executing interrupts. We have no way of helping you without knowing:

1. switch_pci
2. mon
3. register requirements and value requirements (for handler)
4. handler that is installed on interrupt 0x1A and what it does, expects, etc.

[DRDOS]

It's pure DR-DOS OS (what else) and really it's just another CPU and also a much faster board...I hope that the PCI adapters can manage this..

[DRDOS]

switch_pci:

WORD switch_pci = 0xB10C;

mon is address of specific PCI adapter, retrieven by:

  for (i=0;i<4;i++)                          // search for crt-controllers
  {
	 asm {  MOV AH,0xb1
			  MOV AL,0x2
			  MOV CX,0xe0
			  MOV DX,0x102C
			  MOV SI,i
			  INT 0x1a
			  MOV register_ah,AH
			  MOV register_bh,BH
			  MOV register_bl,BL
		  }
	 if (register_ah != 0x86)                 // found crt-controller
	 {
		moni[i] = register_bl;                 // store address
		loggerDigit("found CRT: ", i+1);
	 }
	 else
		break;
  }

[VirtualAce]

It's pure DR-DOS OS (what else) and really it's just another CPU and also a much faster board...I hope that the PCI adapters can manage this..

This makes no sense.

What does 0x1A do? I am not familiar with DRDOS and have no need of it. If you are going to relegate yourself to outdated programming, then buy some outdated books and read them.

[DRDOS]

Funny, in this forum I always have to post the solution by myself...
Maybe this helps others too:
The issue is that newer boards can have more than 1 pci bus, and if not specified
bus number 0 is taken by default. Solution: Specify correct pci bus number:

MOV BH,pciBusNumber

DRDOS

[VirtualAce]

You did not give a clear indication of what interrupt 0x1A even did. How are we supposed to know what the values being passed in the registers even do w/o more information?

That's like me asking you to tell me what this does.

...
__asm {
  mov ecx,160d
  mov edx,100d
  mov eax,04d
  int 33h
}

If you think that by posting tidbits of arcane, unexplained assembly on this board makes you an uber coder, you are sorely mistaken.

Perhaps you need to read the FAQ on how to ask a good question. If you follow the FAQ you are definitely going to get better responses from the board.

[Salem]

Mmm, so by "board" you mean something in say a 6U form factor which is used in an embedded environment rather than say an Asus which is found in a normal desktop machine?