Asking for hint: annunciators and HGR

4 posts / 0 new
Last post
Offline
Last seen: 18 hours 18 min ago
Joined: May 26 2025 - 16:10
Posts: 33
Asking for hint: annunciators and HGR

Hi everyone !

It is not the first time I read some quick phrase about Annunciators implying different behavior of HGR colors.

Are they talking about the 4 Annunciator lines in the joystick DIP socket, or something else?

 

Thank you all !

Julian

 

 

 

mmphosis's picture
Offline
Last seen: 1 week 1 day ago
Joined: Aug 18 2005 - 16:26
Posts: 455
double width graphics / annunciator soft switches

I am not sure what you are referencing but starting with the Apple IIe that has "double width" graphics there are I/O locations that affect graphics. These graphics soft switch locations overlap with the annunciator lines in the joystick DIP socket.

https://www.kreativekorp.com/miscpages/a2info/iomemory.shtml

C058 49240 CLRAN0       OE G WR   If IOUDIS off: Annunciator 0 Off
           DISXY          C  WR   If IOUDIS on: Mask X0/Y0 Move Interrupts
C059 49241 SETAN0       OE G WR   If IOUDIS off: Annunciator 0 On
           ENBXY          C  WR   If IOUDIS on: Allow X0/Y0 Move Interrupts
C05A 49242 CLRAN1       OE G WR   If IOUDIS off: Annunciator 1 Off
           DISVBL         C  WR   If IOUDIS on: Disable VBL Interrupts
C05B 49243 SETAN1       OE G WR   If IOUDIS off: Annunciator 1 On
           ENVBL          C  WR   If IOUDIS on: Enable VBL Interrupts
C05C 49244 CLRAN2       OE G WR   If IOUDIS off: Annunciator 2 Off
           X0EDGE         C  WR   If IOUDIS on: Interrupt on X0 Rising
C05D 49245 SETAN2       OE G WR   If IOUDIS off: Annunciator 2 On
           X0EDGE         C  WR   If IOUDIS on: Interrupt on X0 Falling
C05E 49246 CLRAN3       OE G WR   If IOUDIS off: Annunciator 3 Off
           Y0EDGE         C  WR   If IOUDIS on: Interrupt on Y0 Rising
           DHIRESON      ECG WR   In 80-Column Mode: Double Width Graphics
C05F 49247 SETAN3       OE G WR   If IOUDIS off: Annunciator 3 On
           Y0EDGE         C  WR   If IOUDIS on: Interrupt on Y0 Falling
           DHIRESOFF     ECG WR   In 80-Column Mode: Single Width Graphics
Online
Last seen: 43 min 24 sec ago
Joined: Feb 27 2021 - 18:59
Posts: 736
only AN3

If you refer to Jim Sather's Understanding the Apple IIe, it explains the function of the AN3 soft switch ($C05E) to insert a delay into the video encoder, which changes the color palette by altering the phase relationship between the bitstream and the colorburst.

Offline
Last seen: 18 hours 18 min ago
Joined: May 26 2025 - 16:10
Posts: 33
Thanks everyone

Thanks everyone!

So a multiple functionality really exists on that annunciator address :-)

 

Now you both gave me ideas where I can find some more details.

Thank you again !

 

Julian

Log in or register to post comments