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DPC+ 176 rows and DPC+ 88 rows will not display properly in Stella or a real Atari 2600 without tricks developed by Lillapojkenpåön here at AtariAge. Problem is that a DPC+ driver update made a change that caused the tricks to stop working using Stella 6.0 through 6.7 AND the Harmony cart. Thanks to SpiceWare, if you put the following file in your bB includes folder, the tricks will work again using the latest version of Stella and the Harmony cart:

DPCplus.arm

 

 

After you put that file in your batari Basic includes folder, any programs that you compile from now on that use the tricks for DPC+ 176 rows and DPC+ 88 rows will look like they're supposed to.

 

[Behind-the-scenes info: In a PM, Rogerpoco tested two programs that were compiled using the updated driver. Photos show that the tricks work on a real Atari 2600 using a Harmony cart.]

 

Speaking of the tricks, the trick for 176 rows looks like this:

   ;***************************************************************
   ;
   ;  Simple fix for the top and bottom rows (only for 176 rows).
   ;
   asm
   lda DF6FRACDATA
   lda DF4FRACDATA
   lda DF0FRACDATA
   lda DF1FRACDATA
   lda DF2FRACDATA
   lda DF3FRACDATA
end

 

The trick for 88 rows looks like this:

   ;***************************************************************
   ;
   ;  Simple fix for top two lines of 88 rows having same color.
   ;
   asm
   lda DF6FRACDATA
   lda DF4FRACDATA
end

 

 

Below are two test example programs with quickly scribbled pixels and colors that show the tricks in action.

 

DPC+ 88 rows .bas file:

test_bb_dpc_88_rows_driver_update.bas

 

DPC+ 88 rows .bin file for use with Stella emulator or Harmony cart:

test_bb_dpc_88_rows_driver_update.bin

 

 

DPC+ 176 rows .bas file:

test_bb_dpc_176_rows_driver_update.bas

 

DPC+ 176 rows .bin file for use with Stella emulator or Harmony cart:

test_bb_dpc_176_rows_driver_update.bin