Re: [hatari-devel] LED with empty floppy drives

[David Savinkoff <dsavnkff@xxxxxxxxx>]

I looked at Hatari code, and the M51017AP FDD Logic IC, and ST schematics.

Hatari is correct in handling the LED.

The FDD LED is on when the FDD Logic IC is selected.
It is a Bug to leave the Floppy drive selected any longer than is required.

EmuTOS should deselect the drive when it is not in use.

Note that both Floppy Drives are individually selectable, and the LED is On
when the Floppy Drive is selected (M51017AP is ready for action).

A lit Red LED on an inactive floppy drive is not good.

----- Nicolas Pomarède wrote:
> Le 09/06/2014 23:09, Nicolas Pomarède a écrit :
> 
> > I can't say if Hatari is wrong about some routines used by Emutos, but
> > at least it's 100 %d identical to real ST with real TOS.
> 
> Regarding emutos 0.9.3 drive detection, it does :
> 
> fdc change drive/side io_porta_old=0x7 io_porta_new=0x5 side 0->0 drive 
> 0->0 VBL=69 HBL=52
> fdc type I restore spinup=off verify=off steprate=3 drive=0 tr=0x0 
> head_track=0x0 VBL=69 video_cyc=26756 340@52 pc=e0710a
> 
> -> select drive A and restore on drive A
> 
> fdc change drive/side io_porta_old=0x5 io_porta_new=0x3 side 0->0 drive 
> 0->1 VBL=69 HBL=58
> fdc type I restore spinup=off verify=off steprate=3 drive=1 tr=0x0 
> head_track=0x0 VBL=69 video_cyc=29948 484@58 pc=e0710a
> 
> -> select drive B and restore on drive B
> 
> 
> But after that, drive B is not unselected, so LED remains ON.
> Emutos should write 0x7 in io_porta register to unselect all drives once 
> the detection sequence is over.
> 
> Nicolas
> 
> 
>