Skip to content

Latest commit

 

History

History
80 lines (53 loc) · 1.93 KB

Cheatsheet.adoc

File metadata and controls

80 lines (53 loc) · 1.93 KB

POKEs for the Micro-/Ulti-PET family

Video modes

Video Geometry

POKE 59520, 1: POKE 59521, HDISP POKE 59520, 38: POKE 59521, HPOS (21)

POKE 59520,  6: POKE 59521, VDISP
POKE 59520, 39: POKE 59521, VPOS (110)
Interlace

POKE 59520, 8 POKE 59521, 2 :REM INTERLACE POKE 59521, 3 :REM DOUBLE VRES

Split screen

  • r40: ALT1: alternate register control I

  • bit 0: if set, enable access to alternate r12/r13 video memory, r20/r21 attribute memory a

  • bit 1: alternate bitmap mode bit

  • bit 2: alternate attribute mode bit

  • bit 3: alternate extended mode bit

  • bit 4: if set, set palette to alternate palette on raster match - reset to original palett

  • bit 5: if set, set bitmap, attribute and extended mode bits to alternate values on raster

  • bit 6: if set, set attribute address memory counter to alternate address on raster match (

  • bit 7: if set, set video memory address counter to alternate address on raster match (r38/

    POKE 59520, 32
POKE 59521, 20+64	:REM MAP REGISTERS TO MEM
POKE 59520 + 30, 100	:REM RLINE LO
POKE 59520 + 31, 1  	:REM RLINE HI
POKE 59520 + 40, 2+32	:REM ALT BITMAP

Joysticks

Single-Joystick

POKE 59484, 14

Dual Joystick

POKE 59484, 12

SPI

SPI control

POKE 59400, 8 :REM slow SPI

DAC Audio

  • $e83f (59455): Control (r/w)

  • b4: enable IRQ when DMA is done (but SPI not yet finished)

  • b3: DMA channel (if not stereo) / Dual-Mono-Flag (if stereo)

  • b2: DMA stereo flag - data bytes are alternating between channel 0 and 1

  • b1: DMA loop flag: if set, and full DMA block has been read, continue from the beginning

  • b0: DMA active: set to start DMA. Will be reset to 0 when DMA ends

    POKE 59455, PEEK(59455) OR 1	:REM RESTART

Bus I/O

POKE 59396, 1		:REM MAP BANK 0, $9xxx to /MEMSEL

Then RC2014 is on Apple II "slot 6", i.e. in $96xx.

Use POKE 9*4096+6*256,x To set the LED in the RC2014 board