login | register
Fri 18 of May, 2012 (00:26 UTC)

V6Z80P Documentation

Similar PagesHistorys5 slideshowPrint

OSCA Hardware Registers

Created by: phil, Last modification: Mon 02 of Jan, 2012 (21:43 UTC)

Write Only Hardware Registers:


Palette
$000-$1FF 256 16bit Words, For each colour: $0RGB


Video Control Registers

  • The system memory "underneath" these registers ($200-$6ff) can be written by setting bit 7 of the port sys_alt_write_page

AddressNameDescription
$200vreg_xhwsHorizontal hardware scrolling
$201vreg_vidctrlGeneral video control
$202vreg_windowSize / position of display
$203vreg_yhws_bplcountVertical hardware scrolling (also bitplane count / pixel size)
$204vreg_rasthiMSB of raster IRQ etc
$205vreg_rastloLSB of raster IRQ
$206vreg_vidpageSelects which 8KB video page CPU sees
$207vreg_sprctrlSprite control
$208mult_writeMultiplier (16 bit)
$20amult_indexMultipicand selector
$20blinedraw_colourLine draw colour index
$20cvreg_ext_vidctrlMore video controls
$20dvreg_linecop_loLine Cop Program address LSB
$20evreg_linecop_hiLine Cop Program address MSB
$20fvreg_palette_ctrlDouble buffer Palette control


Blitter
AddressNameDescription
$210blit_src_locSource address in VRAM (15:0)
$212blit_dst_locDestination address in VRAM (15:0)
$214blit_src_modSource modulo (7:0)
$215blit_dst_modDestination modulo (7:0)
$216blit_heightLines in blit operation less one
$217blit_widthHorizontal bytes in blit operation less one, and Start Blit
$218blit_misc Modulo MSBs / Source MSB (16) / Dest MSB (16)
$219blit_src_msb Source MSBs (19:16)
$21ablit_dst_msb Destination MSBs (19:16)


Line Draw
AddressNameDescription
$220linedraw_reg0Bresenham Decision Register 0
$222linedraw_reg1Breshenham Decision Register 1
$224linedraw_reg2Line Start Address (15:0)
$226linedraw_reg3Octant code and Start Line Draw
$228linedraw_reg4Same function as reg0, 2nd register set
$22alinedraw_reg5Same function as reg1, 2nd register set
$22clinedraw_reg6Same function as reg2, 2nd register set
$22elinedraw_reg7Same function as reg3, 2nd register set
$230linedraw_lut0Look up table: Write with (65536-Window width)+1
$232linedraw_lut1Look up table: Write with (65536-Window width)-1
$234linedraw_lut2Look up table: Write with Window width + 1
$236linedraw_lut3Look up table: Write with Window width - 1
$238linedraw_lut4Look up table: Write with 1
$23alinedraw_lut5Look up table: Write with 65535
$23clinedraw_lut6Look up table: Write with (65536 - Window width)
$23elinedraw_lut7Look up table: Write with Window width


Bitplane Locations
AddressNameDescription
$240bitplane0a_locLocation of Bitplane 0
$244bitplane1a_locLocation of Bitplane 1
$248bitplane2a_locLocation of Bitplane 2
$24cbitplane3a_locLocation of Bitplane 3
$250bitplane4a_locLocation of Bitplane 4
$254bitplane5a_locLocation of Bitplane 5
$258bitplane6a_locLocation of Bitplane 6
$25cbitplane7a_locLocation of Bitplane 7
$260bitplane0b_locLocation of Bitplane 0 - register set B
$264bitplane1b_locLocation of Bitplane 0 - register set B
$268bitplane2b_locLocation of Bitplane 0 - register set B
$26cbitplane3b_locLocation of Bitplane 0 - register set B
$270bitplane4b_locLocation of Bitplane 0 - register set B
$274bitplane5b_locLocation of Bitplane 0 - register set B
$278bitplane6b_locLocation of Bitplane 0 - register set B
$27cbitplane7b_locLocation of Bitplane 0 - register set B
$243bitplane_resetClear the internal video fetch offset counter
$247bitplane_modulowords to skip at right edge of window. 0 = reuse same line.


Sprite Priority Registers
AddressDescription
$280 Bit 0: bgnd colours 00-0F mask level 0, Bit 1: bgnd colours 00-0F mask level 1
$281 Bit 0: bgnd colours 10-1F mask level 0, Bit 1: bgnd colours 10-1F mask level 1
$282 Bit 0: bgnd colours 20-2F mask level 0, Bit 1: bgnd colours 20-2F mask level 1
$283 Bit 0: bgnd colours 30-3F mask level 0, Bit 1: bgnd colours 30-3F mask level 1
$284 Bit 0: bgnd colours 40-4F mask level 0, Bit 1: bgnd colours 40-4F mask level 1
$285 Bit 0: bgnd colours 50-5F mask level 0, Bit 1: bgnd colours 50-5F mask level 1
$286 Bit 0: bgnd colours 60-6F mask level 0, Bit 1: bgnd colours 60-6F mask level 1
$287 Bit 0: bgnd colours 70-7F mask level 0, Bit 1: bgnd colours 70-7F mask level 1
$288 Bit 0: bgnd colours 80-8F mask level 0, Bit 1: bgnd colours 80-8F mask level 1
$289 Bit 0: bgnd colours 90-9F mask level 0, Bit 1: bgnd colours 90-9F mask level 1
$28A Bit 0: bgnd colours A0-AF mask level 0, Bit 1: bgnd colours A0-AF mask level 1
$28B Bit 0: bgnd colours B0-BF mask level 0, Bit 1: bgnd colours B0-BF mask level 1
$28C Bit 0: bgnd colours C0-CF mask level 0, Bit 1: bgnd colours C0-CF mask level 1
$28D Bit 0: bgnd colours D0-DF mask level 0, Bit 1: bgnd colours D0-DF mask level 1
$28E Bit 0: bgnd colours E0-EF mask level 0, Bit 1: bgnd colours E0-EF mask level 1
$28F Bit 0: bgnd colours F0-FF mask level 0, Bit 1: bgnd colours F0-FF mask level 1

Sprite Registers

$400-$5Fb - 127 x 4-byte sprite registers when double buffering is disabled (default)

or, when double buffer mode is enabled:

$400-$4Fb - First set of 63 Sprite Registers
$500-$5fb - Second set of 63 Sprite Registers


For each sprite:
OffsetDescription
$00X coordinate LSB
$01Bits 7:4 = Height, 3=Mirror, 2 = Def MSB, 1 = Y MSB, 0 = X MSB
$02Y coordinate LSB
$03Definition LSB


Multiplication Table:
$600-$7FF256 Words (signed)



Read Only Video Registers


LocationNameDescription
$700vreg_readVideo status bits (byte)
$704mult_readResult of multiplication (word)



Search


Last modif pages

  1. FLOS
  2. V6Z80P wiki
  3. Disclaimers
  4. SET
  5. FILEINFO
  6. INPUTSTR
  7. INPUTNUM
  8. GOTO
  9. IF
  10. return messages
Show More…