From: William PECNIK <wpecnik@tecwec.org>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] can anybody check ?
Date: Mon, 8 Dec 2008 01:38:20 +0100 [thread overview]
Message-ID: <200812080138.21206.wpecnik@tecwec.org> (raw)
Hello,
Perhaps not the good way to report a "potential" bug, but i try ....
in hw/fdc.c in qemu-0.9.1.tar.gz line 768-781
static uint32_t fdctrl_read_dor (fdctrl_t *fdctrl)
{
uint32_t retval = 0;
/* Drive motors state indicators */
if (drv0(fdctrl)->drflags & FDRIVE_MOTOR_ON)
retval |= 1 << 5;
if (drv1(fdctrl)->drflags & FDRIVE_MOTOR_ON)
retval |= 1 << 4;
/* DMA enable */
retval |= fdctrl->dma_en << 3;
/* Reset indicator */
retval |= (fdctrl->state & FD_CTRL_RESET) == 0 ? 0x04 : 0;
/* Selected drive */
retval |= fdctrl->cur_drv;
FLOPPY_DPRINTF("digital output register: 0x%02x\n", retval);
return retval;
}
In my book PC Programming System edition CampuPress they say:
bit 7 r/w motor on drive 3
bit 6 r/w motor on drive 2
bit 5 r/w motor on drive 1
bit 4 r/w motor on drive 0,
... for the port 0x3F2
and as i can see in source it is inverse , can anybody confirm ?
thanks a lot
william pecnik
next reply other threads:[~2008-12-08 0:58 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-08 0:38 William PECNIK [this message]
2008-12-11 17:05 ` [Qemu-devel] can anybody check ? Blue Swirl
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