[Emutos-devel] Upper Hardware addresses

[<mdo...@mu...>]

Hi, Joy!

You wrote in the changelog.txt:

- cartridge is defined at $00fa0000, not $fffa0000 - fixed. (joy)

I remember, that once there had been a discussion about to set the upper
byte to 0xff or not. I don't remember the reasons now, why they should be
set - I think, because of more modern hardware. There are many parts in
EmuTOS, which use higher hw-addresses, e.g. in bios/machine.c:

/* vme */

int has_vme;

static void detect_vme(void)
{
  volatile BYTE *vme_mask = (BYTE *) 0xffff8e0d;
  volatile BYTE *sys_mask = (BYTE *) 0xffff8e01;
  
  if(check_read_byte(0xffff8e09)) {
    *vme_mask = 0x40;  /* ??? IRQ3 from VMEBUS/soft */
    *sys_mask = 0x14;  /* ??? set VSYNC and HSYNC */
    has_vme = 1;
  } else {
    has_vme = 0;
  }
}


Ok, Laurent will be back in 4 days. Maybe, we should discuss it with him. What do you think?

--
Martin