BPLAMx for selecting color banks

Auscoder · 13 March 2022, 16:33

Hey all, I am running a quick sanity check by here as I am having trouble getting this working.

Do I set the bits 15-08 (BPLAM) of DFF10C to the colour bank I want to switch to by setting BPLAM bits as == colour bank (0-7) * 32?

As I read BPLAM is xor'd with the bit plane colour index. So it seems setting BPLAM like above results in bitplane colour i (0-31) using bank n = (n*32) + i.

Have I got that right? I am with PF2 has priority over PF1 if that makes any difference.

Edit: Never mind, after all that I forgot to shift the result into BPLAM

- For reference in case of search here is slow destructive sample.

Code:

MOVE.W #BANK0-7,D0
ASL.W #5,D0 ; MULT * 32
ASL.W #8,D0 ; SHIFT IN TO BPLAM
; Write d0 to BPLCON4

13 March 2022, 16:33	#1
Auscoder Registered User Join Date: Jan 2019 Location: Brisbane Posts: 99	BPLAMx for selecting color banks Hey all, I am running a quick sanity check by here as I am having trouble getting this working. Do I set the bits 15-08 (BPLAM) of DFF10C to the colour bank I want to switch to by setting BPLAM bits as == colour bank (0-7) * 32? As I read BPLAM is xor'd with the bit plane colour index. So it seems setting BPLAM like above results in bitplane colour i (0-31) using bank n = (n32) + i. Have I got that right? I am with PF2 has priority over PF1 if that makes any difference. Edit: Never mind, after all that I forgot to shift the result into BPLAM - For reference in case of search here is slow destructive sample. Code: MOVE.W #BANK0-7,D0 ASL.W #5,D0 ; MULT 32 ASL.W #8,D0 ; SHIFT IN TO BPLAM ; Write d0 to BPLCON4 Last edited by Auscoder; 14 March 2022 at 03:04. Reason: User error!!

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