|
|
Atari coding BBS
| Re: Floppy led blinking? |
|---|
|
Posted by: xia
|
Nov,18.2009-20:31
|
To quote from hardware.txt:
| |14 Port A BIT 7 6 5 4 3 2 1 0|
| | IDE Drive On/OFF -------------------+ | | | | | | || (F030)
| | SCC A (0=LAN, 1=Serial2) -----------' | | | | | | || (TT)
| | Monitor jack GPO pin -----------------+ | | | | | ||
| | Internal Speaker On/Off --------------' | | | | | || (F030)
| | Centronics strobe ----------------------' | | | | ||
| | RS-232 DTR output ------------------------' | | | ||
| | RS-232 RTS output --------------------------' | | ||
| | Drive select 1 -------------------------------' | ||
| | Drive select 0 ---------------------------------' ||
| | Drive side select --------------------------------'|
So when you issue a port command to the ym and use a simple move.b to flip the bits you want on, you're turning bit 7 off, which turns the internal Falcon IDE off, which could lead to data loss.
Safest way to do it is the classic read byte/mask off bits you want to change/change them/write byte back.
|
[All messages in this thread] [Start new thread]
|
Topic
|
Posted by
|
Date
|
|
Floppy led blinking?
|
Dbug
|
Nov,17.2009-01:40
|
|
Re: Floppy led blinking?
|
PeP
|
Nov,17.2009-02:24
|
|
Re: Floppy led blinking?
|
ggn
|
Nov,17.2009-10:43
|
|
Re: Floppy led blinking?
|
Dbug
|
Nov,17.2009-14:02
|
|
Re: Floppy led blinking?
|
ggn
|
Nov,17.2009-14:36
|
|
Re: Floppy led blinking?
|
Defjam
|
Nov,17.2009-18:58
|
|
Re: Floppy led blinking?
|
Per Almered (XiA)
|
Nov,18.2009-11:15
|
|
Re: Floppy led blinking?
|
earx
|
Nov,18.2009-14:37
|
|
Re: Floppy led blinking?
|
xia
|
Nov,18.2009-20:31
|
|
Re: Floppy led blinking?
|
ggn
|
Nov,18.2009-20:32
|
|
Re: Floppy led blinking?
|
lp060
|
Nov,19.2009-12:09
|
|
Re: Floppy led blinking?
|
Dbug
|
Nov,19.2009-20:21
|
|
Re: Floppy led blinking?
|
lp060
|
Nov,22.2009-19:47
|
|
Re: Floppy led blinking?
|
Creature XL
|
Dec,11.2009-01:58
|
|
Re: Floppy led blinking?
|
Zorro 2
|
Nov,24.2009-17:18
|
|
Re: Floppy led blinking?
|
FatRakoon
|
Feb,23.2010-05:05
|
What's the anti-troll code?
That's your personal code to be able to add comments and messages on the dhs.nu site.
Don't have a code or forgot it? Fix it here.
|
