640x256 HAM8 mode init

milikabdp · 24 October 2017, 01:47

Hello,
Ive started to remember my ols asm days and wanted to experiment a bit with ham8 modes.
But i think i got stupid and cant initialize ham8 mode in hi res.
Tried to find a calculation example and/or sample code, but the mode is a bit strange so after a few days im writing this

Code:

	move.w	#$8810,BPLCON0			;
	move.w	#$0000,BPLCON1			; horizontal scroll 0
	move.w	#$0080,BPL1MOD			; odd modulo
	move.w	#$0080,BPL2MOD			; even modulo
	move.w	#$2c81,DIWSTRT			; DIWSTRT - topleft corner 
	move.w	#$f4c1,DIWSTOP			; DIWSTOP - bottomright corne
	move.w	#$003c,DDFSTRT			; DDFSTRT
	move.w	#$00d4,DDFSTOP			; DDFSTOP

I need 640x256 in ham8 and later 640x180 can someone please help

Regards

Leffmann · 25 October 2017, 16:12

For an interleaved bitmap aligned on 8 bytes:

Code:

  move.w  #bpl_8bpl|bpl_ham|bpl_hires|bpl_color, bplcon0
  move.w  #0, bplcon1
  move.w  #0, bplcon2
  move.w  #bpl_pf2offs8|bpl_spreslo, bplcon3
  move.w  #bpl_evenbank1|bpl_oddbank1, bplcon4
  move.w  #fmode_bpl64, fmode
  move.w  #640/8*7, bpl1mod
  move.w  #640/8*7, bpl2mod
  move.w  #$38, ddfstrt
  move.w  #$c0, ddfstop
  move.w  #$2c81, diwstrt
  move.w  #$2cc1, diwstop
; move.w  #$e0c1, diwstop

milikabdp · 25 October 2017, 21:21

Wow, great example.
Thank you.

I will start testing

24 October 2017, 01:47	#1
milikabdp Registered User Join Date: Sep 2017 Location: Novi Sad Posts: 23	640x256 HAM8 mode init Hello, Ive started to remember my ols asm days and wanted to experiment a bit with ham8 modes. But i think i got stupid and cant initialize ham8 mode in hi res. Tried to find a calculation example and/or sample code, but the mode is a bit strange so after a few days im writing this Code: move.w #$8810,BPLCON0 ; move.w #$0000,BPLCON1 ; horizontal scroll 0 move.w #$0080,BPL1MOD ; odd modulo move.w #$0080,BPL2MOD ; even modulo move.w #$2c81,DIWSTRT ; DIWSTRT - topleft corner move.w #$f4c1,DIWSTOP ; DIWSTOP - bottomright corne move.w #$003c,DDFSTRT ; DDFSTRT move.w #$00d4,DDFSTOP ; DDFSTOP I need 640x256 in ham8 and later 640x180 can someone please help Regards

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25 October 2017, 21:21	#3
milikabdp Registered User Join Date: Sep 2017 Location: Novi Sad Posts: 23	Wow, great example. Thank you. I will start testing

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