App. 3:Hardware Addresses

  1. Basic Address Ranges

    The 6502 CPU has an address range of 64K bytes. The upper 1K byte of address space is shared by the RAM, the ROM, Suzy hardware and Mikey hardware. This upper 1K byte of space is divided as tollows:

    FFFE, FFFF
    CPU Interrupt Vector (RAM or ROM)
    FFFC, FFFD
    CPU Reset Vector (RAM or ROM)
    FFFA, FFFB
    CPU NMI Vector (RAM or ROM)
    FFF9
    Memory Map Control (Mikey and Suzy hardware)
    FFF8
    Reserved for future hardware (RAM)
    FE00 thru FFF7
    ROM Space
    FD00 thru FDFF
    Mikey Space
    FC00 thru FCFF
    Suzy Space

    The above listed adress ranges (except for FFF8 and FFF9) can, under control of the CPU, have RAM overlayed on them. These overlays are controlled by the bits in the hardware register at FFF9. Both Mikey and Suzy accept a write at those addresses but only Mikey responds to a read.

    The remaining 63k bytes are RAM.

    These address ranges affect only CPU accesses from Mikey. The video and refresh generators in Mikey and the sprite engine in Suzy see the entire 64K byte range as RAM.


    BIG NOTE!!!!! We are done messing around with these addresses. Do not change them anymore!!!
    1. Legend

      (W), (R), (R/W) indicate write only, read only, and read/write capability of a particular address.
      Please follow the rules:

      If an address is read only, DON'T write to it.
      If an address is write only, DON'T read it.

      The reset condition is shown with bit 7 on the left (B7......B0). X indicates unchanged by reset.

      (U) indicates that it is unsafe to read or write this address without first checking (at a different address) to see if it is available. Please follow the rules. A description of UNSAFE is in the hardware specification.

      (CPU), (ENG), (SCB), indicate the usual source of data for this particular address.
      CPU = Mikey,
      ENG = sprite engine,
      SCB = DMA from the RAM based sprite control block.

    2. Memory Map Control

      FFF9 = MAPCTL. Memory Map Control
      (R/W)Mikey reset = 0,0,0,0,0,0,0,0
      (W) Suzy reset x,x,x,x,x,x,x,0
      (0nly bit 0 is implemented)

      B7 = sequential disable. If set, the CPU will always use full cycles (5 ticks min), never a sequential cycle (4 ticks).
      B6, B5, B4 = reserved for future use
      B3 = FFFA -> FFFF, Vector Space
      B2 = FE00 -> FFF7, ROM Space
      B1 = FD00 -> FDFF, Mikey Space
      B0 = FC00 -> FCFF, Suzy Space

      All 8 bits are set to 0 at reset. Any address space bit that is set to a 1 will cause its related address space to access RAM instead of the hardware or ROM normally accessed.

  2. Suzy Addresses

    FC00 -> FC7F = Sprite Control Block (R/W) (U)
    reset x,x,x,x,x,x,x,x
    Even addresses are the LSB.
    Any CPU write to an LSB will set the MSB to 0.

    Name machine $FCxx description
    L0 (ENG) 00,01 TMPADRL,H Temporary address
    H0 (ENG) 02,03 TILTACUML,H Accumulator for tilt value
    L1 (CPU) 04,05 HOFFL,H Offset to H edge of screen
    H1 (CPU) 06,07 VOFFL,H Offset to V edge of screen
    L2 (CPU) 08.09 VIDBASL,H Base Address of Video Build Buffer
    H2 (CPU) 0A,0B COLLBASL,H Base Address of Coll Build Buffer
    L3 (ENG) 0C,0D VIDADRL,H Current Video Build Address
    H3 (ENG) 0E.0F COLLADRL H Current Collision Build Address
    L4 (SCB) 10,11 SCBNEXTL,H Address of Next SCB
    H4 (SCB) 12,13 SPRDLINEL,H Start of Sprite Data Line Address
    LS (SCB) 14,15 HPOSSTRTL,H Starting Hpos
    H5 (SCB) 16,17 VPOSSTRTL,H Starting Vpos
    L6 (SCB) 18,19 SPRHSIZL,H H Size
    H6 (SCB) 1A,1B SPRVSIZL,H V Size
    L7 (ENG) 1C,1D STRETCHL H H Size Adder
    H7 (ENG) 1E,1F TILTL,H H Position Adder
    LS (ENG) 20,21 SPRDOFFL,H Offset to Next Sprite Data Line
    HS (ENG) 22,23 SPRVPOSL,H Current Vpos
    L9 (CPU) 24,25 COLLOFFL,H Offset to Collision Depository
    H9 (ENG) 26,27 VSIZACUML,H Vertical Size Accumulator
    L10 (CPU) 28,29 HSIZOFFL,H Horizontal Size Offset
    H10 (CPU) 2A,2B VSIZOFFL,H Vertical Size Offset
    L11 (ENG) 2C,2D SCBADRL,H Address of Current SCB
    H11 (ENG) 2E,2F PROCADRL,H Current Spr Data Proc Address
    --- (ENG) 30 thru 4F reserved
    --- (ENG) 50,51 Do Not Use
    H4 (ENG) 52 MATHD (12)
    H4 (ENG) 53 MATHC (13)
    L5 (ENG) 54 MATHB (14)
    L5 (ENG) 55 MATHA (15)
    H5 (ENG) 56 MATHP (16)
    H5 (ENG) 57 MATHN (17)
    --- (ENG) 58 thru 5F Do Not Use
    L8 (ENG) 60 MATHH (20)
    L8 (ENG) 61 MATHG (21)
    H8 (ENG) 62 MATHF (22)
    H8 (ENG) 63 MATHE (23)
    --- (ENG) 64 thru 6B Do Not Use
    L11 (ENG) 6C MATHM (2C)
    L11 (ENG) 6D MATHL (2D)
    H11 (ENG) 6E MATHK (2E)
    H11 (ENG) 6F MATHJ (2F)
    --- (ENG) 70 thru 7F Do Not Use-

    FC80 = SPRCTL0 Sprite Control Bits 0 (W)
    (U) reset x,x,x,x,x,x,x,x

    B7,B6 = bits/pixel-1 (1,2,3,4)
    B5 = H flip, 0 = not flipped
    B4 = V flip, 0 = not flipped
    B3 reserved
    B2,B1,B0 = Sprite Type
    7 -> shadow
    6 -> exclusive-or, shadow
    5 -> non-collidable
    4 -> normal
    3 -> boundary
    2 -> boundary-shadow
    1 -> background-no collision
    0 -> background, shadow

    FC81 = SPRCTL1 Sprite Control Bits 1 (W)(U)
    reset x,x,x,x,x,x,x,x

    B7 = literal attribute, 0=normal, 1=totally literal
    B6 = Sizing algorithm choice, 0=adder (algo 4), 1=shifter (algo 3)
    SET IT T0 ZERO!!!!, algo 3 is broke
    B5,B4 = Reloadable depth.
    0=none.
    1=Hsize,Vsize.
    2=Hsize,Vsize,Stretch.
    3=Hsize, Vsize,Stretch, Tilt.
    B3 = Palette re-load. 0=reload the palette, 1 use existing palette.
    B2 = Skipsprite. 1 skip this sprite, 0=use this sprite.
    B1 = Start drawing up (1=up, 0=down)
    B0 = Start drawing left (1 left, 0=right)

    FC82 = SPRCOLL. Sprite Collision Number (W)
    (U) reset = x,x,x,x,x,x,x,x

    B7,B6 = 0
    B5 = dont collide. 1=dont collide with this sprite.
    B4 = 0
    B3,B2,B1,B0 = number

    FC83 = SPRINIT. Sprite Initialization Bits (W)(U)
    reset x,x,x,x,x,x,x,x

    B7 = fc1, B6 = fc2, B5 = fc3, B4 = reserved
    B3 = ac1, B2 = ac2, B1 = ac3, B0 = ac4

    Set to '$F3' after at least 100ms after power up and before any sprites are drawn.

    FC84 -> FC87 = not yet atlocated

    FC88 = SUZYHREV. Suzy Hardware Revision (R)

    = '01'

    FC89 = SUZYSREV. Suzy Software Revision

    no actual register is implemented

    FC8A -> FC8F = not yet atlocated

    FC90 = SUZYBUSEN. Suzy Bus Enable (W)
    reset = 0

    B0 = Suzy Bus Enable, 0=disabled

    FC91 = SPRG0. Sprite Process Start Bit (W)
    reset = 0

    B0 = Sprite process enabled, 0=disabled.
    Write a 1 to start the process, at completion of process this bit will be reset to 0. Either setting or clearing this bit will clear the Stop At End Of Current Sprite bit.
    B1 = reserved
    B2= enable everon detector. 1 = enabled.

    FC92 = SPRSYS. System Control Bits (R/W)
    (write) reset x,x,x,x,x,x,x,x

    B7 = Signmath. 0 =unsigned math, 1 =signed math.
    B6 = OK to accumulate. 0 = do not accumulate, 1 = yes,accumulate.
    B5 = dont collide. 1 = don't collide with any sprites.
    B4 = Vstretch. 1 = stretch the v. 0 = Don't play with it, it will grow by itself.
    B3 = Lefthand, 0 =normal handed
    B2 = Clear the 'unsafeAccess' bit. 1 = clear it. 0 = no change.
    B1 = Stop at end of current sprite, 1 request to stop.
    Continue sprite processing by setting the Sprite Process Start Bit. Either setting or clearing the SPSB will clear this stop request.
    B0 = has no effect
    (read) reset 0,0,0,x,x,0,x,0
    B7 = Math in process
    B6 = Mathbit. If mult, 1 = accumulator overflow. If div, 1 = div by zero attempted.
    B5 = Last carry bit.
    B4 = Vstretch.
    B3 = Lefthand.
    B2 = UnsafeAccess. 1 = Unsafe Access was performed.
    B1 = Stop at end of current sprite, 1 = request to stop.
    B0 = Sprite process was started and has neither completed nor been stopped.

    FC93 -> FCAF = not yet allocated

    FCB0 JOYSTICK. Read Joystick and Switches(R)

    	If Lefthand=1	If Lefthand=0
	B7 = Joy Up	    (Down)
	B6 = Joy Down	    (Up)
	B5 = Joy Left	    (Right)
	B4 = Joy Right	    (Left)
	B3 = Option 1	    Option 1
	B2 = Option 2	    Option 2
	B1 = Inside	    Inside
	B0 = Outside	    Outside

    FCB1 = SWITCHES. Read Other Switches (R)

    B7 = 0
    B6 = 0
    B5 = 0
    B4 = 0
    B3 = 0
    B2 = Cart1 I/O Inactive
    B1 = Cart0 I/O Inactive
    B0 = Pause (was Flablode)
    Lynx buttons

    This Picture shows the Normal orientation of the unit, which according to our previous definition is the LeftHand orientation. Please realize that this means that the normal setup is Flip off, and LeftHand on.
    The current agreement is that Pause and Option 1 pressed together will result in the patter of little rubber feet around the house. Also, Pause and Option 2 pressed together will be used to indicate a user request for the Flip function.

    FCB2,FCB3 RCART(R/W)

    Read or write 8 bits of data.

    FCB2 uses 'CART0/' as the strobe.
    FCB3 uses 'CART1/’ as the strobe.

    FCB4-> FCBF = not yet allocated

    FCC0 LEDS (W)
    reset=0,0,0,0,0,0,0,0

    A '0' in a bit will turn its corresponding LED on.

    FCC1 Reserved

    FCC2 Parallel Port Status(R/W)
    reset 0,0,x,x,x,x,x,x
    (write)

    B7 = direction, 0 = input, 1 = output
    B6 = paper out, used to signal the device at the other end of the parallel cable.

    (read)

    B7 = data available.
    When port is in input mode, B7=1 indicates that a character has arrived and not yet been read by the CPU. This bit will be cleared when the CPU reads the parallel port data.
    When in output mode, B7=1 indicates that an output character is in the data register and awaiting acknowledgement from the device on the other end of the parallel cable. This bit is cleared when that other device accepts the character. In addition, this bit is cleared whenever the direction of the port is changed.

    B6 = Hello Handy

    This bit is connected to the 'Busy' pin of the parallel port. It is intended as a signal fine FROM the device on the other end of the parallel cable.

    FCC3 Parallel Port Data (R/W)

    Read or write as appropriate.

    FCC4 Howie (R/W)

    Read or write as appropriate.

    FCC5 Reserved

    FCC6 -> FCCF = not yet allocated

    FCD0 -> FCFF = not yet allocated

  3. Mikey Addresses (R/W)

    Timers

    Timers are reset to 0

    FD00 -> FD03 Timer channel 0 and Hcount
    FD04 -> FD07 Timer channel 1 and mag0a (read current state of TAPE0 in b7)
    FD08 -> FD0B Timer channel 2 and Vcount
    FD0C -> FD0F Timer channel 3 and mag0b
    FD10 -> FD13 Timer channel 4 and serial rate
    FD14 -> FD17 Timer channel 5 and mag1a (read current state of TAPE1 in b7)
    FD18 -> FD1B Timer channel 6
    FD1C -> FD1F Timer channel 7 and mag1b

    FD00 = TIM0BKUP. HTIMBKUP. Timer 0 backup value
    FD01 = TIM0CTLA. HTIMCTL0. Timer 0 static control
    FD02 = TIM0CNT. Timer 0 current count
    FD03 = TIM0CTLB. Timer 0 dynamic control
    FD04 = TIM1BKUP. MAGA. Timer 1 backup vatue
    FD05 = TIM1CTLA. Timer 1 static control
    FD06 = TIM1CNT. Timer 1 current count
    FD07 = TIM1CTLB. Timer 1 dynamic control
    FD08 = TIM2BKUP. VTIMBKUP. Timer 2 backup value
    FD09 = TIM2CTLA. Timer 2 static control
    FD0A = TIM2CNT. Timer 2 current count
    FD0B = TIM2CTLB. Timer 2 dynamic control
    FD0C = TIM3BKUP.MAGB. Timer 3 backup value
    FD0D = TIM3CTLA. Timer 3 static control
    FD0E = TIM3CNT. Timer 3 current count
    FD0F = TIM3CTLB. Timer 3 dynamic control
    FD10 = TIM4BKUP. BAUDBKUP. Timer 4 backup value
    FD11 = TIM4CTLA, Timer 4 static control
    FD12 = TIM4CNT. Timer 4 current count
    FD13 = TIM4CTLB. Timer 4 dynamic control
    FD14 = TIM5BKUP. MAGC. Timer 5 backup value
    FD15 = TIMSCTLA. Timer 5 static control
    FD16 = TIM5CNT. Timer 5 current count
    FD17 = TIMSCTLB. Timer 5 dynamic control
    FD18 = TIM6BKUP. Timer 6 backup value
    FD19 = TIM6CTLA. Timer 6 static control
    FD1A = TIM6CNT. Timer 6 current count
    FD1B = TIM6CTLB. Timer 6 dynamic control
    FD1C = TIM7BKUP.MAGD. Timer 7 backup value
    FD1D = TIM7CTLA. Timer 7 static control
    FD1E = TIM7CNT. Timer 7 current count
    FD1F = TIM7CTLB. Timer 7 dynamic control

    xxx0 HEX 7 6 5 4 3 2 1 0
    backup value
    xxx1 HEX 7 6 5 4 3 2 1 0
    control bits
    Enable interrupt $80 1... ....
    Reset Timer Done $40 .1.. ....
    Unused in timers 0,2,4,6 / Magmode in timers 1,3,5,7 $20 ..1. ....
    Enable reload $10 ...1 ....
    Enable count $08 .... 1...
    clock select
    linking $07 .... .111
    64us $06 .... . 1 1 0
    32us $05 .... . 1 0 1
    16us $04 .... . 1 0 0
    8us $03 .... . 0 1 1
    4us $02 .... . 0 1 0
    2us $01 .... . 0 0 1
    1us $00 .... . 0 0 0
    xxx2 HEX 7 6 5 4 3 2 1 0
    current value
    xxx3 HEX 7 6 5 4 3 2 1 0
    more control bits
    Timer Done(1) $08 .... 1...
    Last clock $04 .... .1..
    Borrow in $02 .... ..1.
    Borrow out $01 .... ...1

    (1) It is set on time out, reset with the reset timer done bit (xxx1, B6)

    Audio

    Audio are reset to 0, all are read/write

    FD20 -> FD27 Audio channel 0, links from timer 7
    FD28 -> FD2F Audio channel 1, links from audio timer 0
    FD30 -> FD37 Audio channel 2, links from audio timer 1
    FD38 -> FD3F Audio channel 3, links trom audio timer 2

    FD20 = 8 bit. 2's Complement Volume Control

    00000000 is zero volume
    00000001 is the same volume as 11111111, but opposite phase.

    FD21 = Shift Register Feedback Enable

    B7= feedback bit 11
    B6=feedback bit 10
    B5=feedback bit 5
    B4=feedback bit 4
    B3=feedback bit 3
    B2=feedback bit 2
    B1=feedback bit 1
    B0=feedback bit 0

    FD22 = Audio Output Value

    In normal mode, shift reg 0 = 0: contains 2's complement of volume register.
    In normal mode, shift reg 0 = 1: contains value of volume register.
    In integrate mode, shift reg 0 = 0: subtract volume register from output.
    In integrate mode, shift reg 0 = 1: add volume register to output.
    note that there is hardware clipping at max and min (ff,00).

    FD23 = Lower 8 Bits of Shift Register

    FD24 = Audio Timer Backup Value

    FD25 = Audio Control Bits

    B7=feedback bit 7
    B6=reset timer done
    B5=enable integrate mode
    B4=enable reload
    B3=enable count
    B2,B1,B0=clock select
    7 = linking
    6 = 64 us
    5 = 32 us
    4 = 16 us
    3 = 8 us
    2 = 4 us
    1 = 2 us
    0 = 1 us

    FD26 = Audio Counter

    Value of the current count at the time it is read

    FD27 = Other Audio Bits

    B7=shift register bit 11
    B6=shift register bit 10
    B5=shift register bit 9
    B4=shift register bit 8
    B3=for Glenn to know and you to find out
    B2=last clock state (0->1 causes count)
    B1=borrow in (1 causes count)
    B0=borrow out (count=0 and borrow in)

    FD40 -> FD4F = not yet altocated

    FD50 = MSTERE0(* R/W)
    reset 0,0,0,0,0,0,0,0
     *Note: Write-only on Howards

    A '1' in the bit disables the indicated audio connection.

    B7 = Audio Channel 3 -> Left Ear
    B6 = Audio Channel 2 -> Left Ear
    B5 = Audio Channel 1 -> Left Ear
    B4 = Audio Channel 0 -> Left Ear
    B3 = Audio Channel 3 -> Right Ear
    B2 = Audio Channel 2 -> Right Ear
    B1 = Audio Channel 1 -> Right Ear
    B0 = Audio Channel 0 -> Right Ear

    FD51 -> FD7F = not yet allocated

    Misc

    FD80 = INTRST.Interrupt Poll 0, (R/W)
    reset = 0,0,0,0,0,0,0,0

    Read is a poll, write will reset the int that corresponds to a set bit.

    FD81 INTSET. Interrupt Poll 1, (R/W)
    reset = 0,0,0,0,0,0,0,0

    Read is a poll, write will set the int that corresponds to a set bit.
    B7 = timer 7
    B6 = timer 6
    B5 = timer 5
    B4 = serial interupt
    B3 = timer 3
    B2 = timer 2 (vertical line counter)
    B1 = timer 1
    B0 = timer 0 (horizontal line timer)

    FD82 -> FD83 = not yet allocated

    FD84 = MAGRDY0.Mag Tape Channel 0 ready bit.(R)
    reset = x

    B7=edge (1 ) Reset upon read.

    FD85 = MAGRDY1. Mag Tape Channel 1 ready bit.(R)
    reset = x

    B7 =edge (1 ) Reset upon read.

    FD86 AUDIN. Audio In.(R)
    reset = b7,0,0,0,0,0,0,0

    B7 = Audio in comparator

    FD87 = SYSCTL1.Control Bits.(W)
    reset x,x,x,x,x,x,1,0

    B1=power (1 = on)
    B0= Cart Address Strobe (also counter reset) (was MotorOn)

    FD88 = MIKEYHREV.Mikey Hardware Revision(R)

    = '01'

    FD89 = MIKEYSREV.Mikey Software Revision(W)

    no actual register is implemented

    FD8A = IODIR.Mikey Parallel I/O Data Direction (W)
    reset = 0,0.0.0,0,0,0,0

    8 bits I/O direction corresponding to the 8 bits at FD8B
    0=input, 1= output,

    FD8B = IODAT.Mikey Parallel Data(sort of a R/W)
    8 bits of general purpose I/O data

    B7 = NC
    B6 = NC
    B5 = NC
    B4 = audin input
    B3 = rest output
    B2 = noexp input
    B1 = Cart Address Data output (0 turns cart power on)
    B0 = External Power input
    (note, ROM sets it to output, you must set it to input)

    Note that some lines are used for several functions, please read the spec.
    Also note that only the lines that are set to input are actually valid for reading.
    --READ THE SPEC----

    FD8C = SERCTL. Serial Control Register.(R/W)
    reset 0,0,0,0,0,0,0,0
    (write)

    B7 = TXINTEN transmitter interrupt enable
    B6 = RXINTEN receive interrupt enable
    B5 = 0 (for future compatibility)
    B4 = PAREN xmit parity enable (if 0, PAREVEN is the bit sent)
    B3 = RESETERR reset all errors
    B2 = TXOPEN 1 open collector driver, 0 = TTL driver
    B1 = TXBRK send a break (for as long as the bit is set)
    B0 = PAREVEN send/rcv even parity

    (read)

    B7 = TXRDY transmitter buffer empty
    B6 = RXRDY receive character ready
    B5 = TXEMPTY transmitter totaiy done
    B4 = PARERR received parity error
    B3 = 0VERRUN received overrun error
    B2 = FRAMERR received framing error
    B1 = RXBRK break recieved (24 bit periods)
    B0 = PARBIT 9th bit

    FD8D = SERDAT. Serial Data .(R/W)
    reset = x,x,x,x,x,x,x,x

    FD8E -> FD8F = not yet allocated

    FD90 = SDONEACK. Suzy Done Acknowledge, (W)
    reset = 0 (not acked)

    FD91 = CPUSLEEP. CPU Bus Request Disable(W)

    A write of '0' to this address will reset the CPU bus request flip fIop.
    The setting of the flip flop is described in the hardware specification.

    FD92 = DISPCTL. Video Bus Reguest Enable, (W)
    reset = 0

    B7,B6,B5,B4 = 0
    B3 = color, 1=color, 0=monochrome
    B2 = fourbit, 1=4 bit mode, 0=2 bit mode
    B1 = 1=flip, 0 normal
    B0 = 1=enable video DMA, 0=disable

    FD93 = PBKUP. Magic 'P' count, (W)
    reset = x,x,x,x,x,x,x,x

    INT((((line time - .5us) / 15) * 4) -1)
    At 60 Hz, 'PBKUP' = 41. (0x29)

    FD94 ->FD95= DISPADRL,H . Start Address of Video Disptay, (W)
    reset x,x,x,x,x,x,x,x

    DISPADRH (FD95) is upper 8 bits of display address.
    DISPADRL (FD94) is lower 8 bits of display address
    with the bottom 2 bit ignored by the hardware The address of the upper left corner of a display buffer must always have '00' in the bottom 2 bits.

    FD96 -> FD9B = not yet altocated

    FD9C = Mtest0,(W)
    reset 0,0,0,0,0,0,0,0

    B7 = ATcnt16
    B6 = ATtest
    B5 = XCLKEN
    B4 = UARTturbo
    B3 = ROMsel
    B2 = ROMtest
    B1 = Mtest
    B0 = CPUtest

    Setting UARTturbo switches the baudrate to 1MBd!

    FD9D = Mtest1,(W)
    reset x,0,0,0,0.0,0,0

    B7 = not used
    B6 = Pcnt16
    B5 = REFcnt16
    B4 = VIDtrig
    B3 = REFtrig
    B2 = VIDdmaDIS
    B1 = REFfast
    B0 = REFdis

    FD9E = Mtest2,(W)
    reset = x,x,x,0,0,0,0,0

    B7 ->B5 not used
    B4 = Vstrobe
    B3 = Vzero
    B2 = H120
    B1 = Hzero
    B0 = Vblankef

    FDA0 -> FDAF =Green Color map, (R/W)
    reset x,x,x,x,x,x,x,x

    B7-> = unused
    B3->B0 = green

    FDB0 -> FDBF =Blue and Red color map,
    (R/W) reset x,x,x,x,x,x,x,x

    B7->B4 = blue
    B3->B0 = red 
    	FDA0 = GREEN0	 FDA8 = GREEN8
	FDA1 = GREEN1	 FDA9 = GREEN9
	FDA2 = GREEN2	 FDAA = GREENA
	FDA3 = GREEN3	 FDAB = GREENB
	FDA4 = GREEN4	 FDAC = GREENC
	FDAS = GREEN5	 FDAD = GREEND
	FDA6 = GREEN6	 FDAE = GREENE
	FDA7 = GREEN7	 FDAF = GREENF

	FDB0 = BLUERED0	 FDB8 = BLUERED8
	FDB1 = BLUERED1	 FDB9 = BLUERED9
	FDB2 = BLUERED2	 FDBA = BLUEREDA
	FDB3 = BLUERED3	 FDBB = BLUEREDB
	FDB4 = BLUERED4	 FDBC = BLUEREDC
	FDB5 = BLUERED5	 FDBD = BLUEREDD
	FDB6 = BLUERED6	 FDBE = BLUEREDE
	FDB7 = BLUERED7	 FDBF = BLUEREDF

    FDC0 -> FDCF = not yet allocated

    FDD0 -> FDFF = not yet allocated

    JOYPAD
    ($FCB0)    		 HEX 7 6 5 4 3 2 1 0 SWITCHES
    ($FCB1)    		 HEX 7 6 5 4 3 2 1 0
    JOYSTICK bit definition SWITCHES bit definitions
    JOY_DOWN $80 1... .... .
    JOY_UP $40 .1.. ....
    JOY_RIGHT $20 ..1. ....
    JOY_LEFT $10 ...1 ....
    OPTION1 $08 .... 1...
    OPTION2 $04 .... .1.. CART1_STROBE $04 .... .1..
    B_BUTTON $02 .... ..1. CART0_STROBE $02 .... ..1.
    A_BUTTON $01 .... ...1 PAUSE_BUTTON $01 .... ...1

    SPRCTL0
    ($FC80)    		 HEX 7 6 5 4 3 2 1 0 SPRCTL1
    ($FC81)    		 HEX 7 6 5 4 3 2 1 0
    Bits-per-pixel definitions Sprite control 1 bit definitions
    ONE PER PIXEL $00 00.. .... LITERAL $80 1... ....
    TWO PER PIXEL $40 01.. .... ALGO 3(1) $40 .1.. ....
    THREE PER PIXEL $80 10.. .... Sprite control 1 bit definitions
    FOUR PER PIXEL $C0 11.. .... RELOAD NONE $00 ..00 ....
    More sprite control 0 it definitions RELOAD HV $10 ..01 ....
    HFLIP $20 ..1. .... RELOAD HVS $20 ..10 ....
    VFLIP $10 ...1 .... RELOAD HVST $30 ..11 ....
    Sprite types More sprite control 1 it definitions
    SHADOW SPRITE $07 ..... 1 1 1 REUSE PALETTE $08 .... 1...
    XOR SPRITE $06 ..... 1 1 0 SKIP SPRITE $04 .... .1..
    NONCOLL SPRITE $05 ..... 1 0 1 DRAW UP $02 .... ..1.
    NORMAL SPRITE $04 ..... 1 0 0 DRAW LEFT $01 .... ..01
    BOUNDARY SPRITE $03 ..... 0 1 1 .
    BSHADOW SPRITE $02 ..... 0 1 0
    BACKNONCOLL SPR $01 ..... 0 0 1
    BACKGROUND SPR $00 ..... 0 0 0

    (1)ALGO 3 is broken !

    SPRGO
    ($FC91)    		 HEX 7 6 5 4 3 2 1 0
    EVER_ON $04 .... .1..
    SPRITE_GO $01 .... ...1

    SPRSYS
    ($FC92)WRITE    		 HEX 7 6 5 4 3 2 1 0 SPRSYS
    ($FC92)READ    		 HEX 7 6 5 4 3 2 1 0
    SIGNMATH $80 1... .... MATHWORKING $80 1... ....
    ACCUMULATE $40 .1.. .... MATHWARNING $40 .1.. ....
    NO_COLLIDE $20 ..1. .... MATHCARRY $20 ..1. ....
    VSTRETCH $10 ...1 .... VSTRETCHING $10 ...1 ....
    LEFTHAND $08 .... 1... LEFTHANDED $08 .... 1...
    CLR_UNSAFE $04 .... .1.. UNSAFE_ACCESS $04 .... .1..
    SPRITESTOP $02 .... ..1. SPRITETOSTOP $02 .... ..1.
      SPRITEWORKING $01 .... ...1

    MAPCNTL
    ($FFF9)    		 HEX 7 6 5 4 3 2 1 0
    MAPCTL flag definitions
    HIGH SPEED $80 1... ....
    VECTOR SPACE $08 .... 1...
    ROM SPACE $04 .... .1..
    MIKEY SPACE $02 .... ..1.
    SUZY SPACE $01 .... ...1

    [CONTENTS]

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    (c) 42Bastian Schick last modified 01/02/23