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sz80em.fs
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sz80em.fs
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namespace FSpectrum
open System
open System.IO
open System.Drawing
open System.Drawing.Imaging
open Microsoft.FSharp.NativeInterop
open System.Windows.Forms
open System.Threading
type IPort =
abstract read: uint16 -> byte
type KeyCode = { row: int; bit: uint8; }
type public IKeyboard =
abstract KeyPressed: Keys -> unit
abstract KeyReleased: Keys -> unit
type KeyboardMsg =
| KeyPressed of Keys
| KeyReleased of Keys
| ReadKeys of uint16 * AsyncReplyChannel<byte>
type Keyboard() = class
let ports = Array.create 8 0xFFuy
let keyMap =
Map.empty.
Add(Keys.ShiftKey, [ { row = 0; bit = 0x01uy } ]).
Add(Keys.Z, [ { row = 0; bit = 0x02uy } ]).
Add(Keys.X, [ { row = 0; bit = 0x04uy } ]).
Add(Keys.C, [ { row = 0; bit = 0x08uy } ]).
Add(Keys.V, [ { row = 0; bit = 0x10uy } ]).
Add(Keys.A, [ { row = 1; bit = 0x01uy } ]).
Add(Keys.S, [ { row = 1; bit = 0x02uy } ]).
Add(Keys.D, [ { row = 1; bit = 0x04uy } ]).
Add(Keys.F, [ { row = 1; bit = 0x08uy } ]).
Add(Keys.G, [ { row = 1; bit = 0x10uy } ]).
Add(Keys.Q, [ { row = 2; bit = 0x01uy } ]).
Add(Keys.W, [ { row = 2; bit = 0x02uy } ]).
Add(Keys.E, [ { row = 2; bit = 0x04uy } ]).
Add(Keys.R, [ { row = 2; bit = 0x08uy } ]).
Add(Keys.T, [ { row = 2; bit = 0x10uy } ]).
Add(Keys.D1, [ { row = 3; bit = 0x01uy } ]).
Add(Keys.D2, [ { row = 3; bit = 0x02uy } ]).
Add(Keys.D3, [ { row = 3; bit = 0x04uy } ]).
Add(Keys.D4, [ { row = 3; bit = 0x08uy } ]).
Add(Keys.D5, [ { row = 3; bit = 0x10uy } ]).
Add(Keys.D0, [ { row = 4; bit = 0x01uy } ]).
Add(Keys.D9, [ { row = 4; bit = 0x02uy } ]).
Add(Keys.D8, [ { row = 4; bit = 0x04uy } ]).
Add(Keys.D7, [ { row = 4; bit = 0x08uy } ]).
Add(Keys.D6, [ { row = 4; bit = 0x10uy } ]).
Add(Keys.P, [ { row = 5; bit = 0x01uy } ]).
Add(Keys.O, [ { row = 5; bit = 0x02uy } ]).
Add(Keys.I, [ { row = 5; bit = 0x04uy } ]).
Add(Keys.U, [ { row = 5; bit = 0x08uy } ]).
Add(Keys.Y, [ { row = 5; bit = 0x10uy } ]).
Add(Keys.Enter, [ { row = 6; bit = 0x01uy} ]).
Add(Keys.L, [ { row = 6; bit = 0x02uy } ]).
Add(Keys.K, [ { row = 6; bit = 0x04uy } ]).
Add(Keys.J, [ { row = 6; bit = 0x08uy } ]).
Add(Keys.H, [ { row = 6; bit = 0x10uy } ]).
Add(Keys.Space, [ { row = 7; bit = 0x01uy } ]).
Add(Keys.ControlKey, [ { row = 7; bit = 0x02uy } ]).
Add(Keys.M, [ { row = 7; bit = 0x04uy } ]).
Add(Keys.N, [ { row = 7; bit = 0x08uy } ]).
Add(Keys.B, [ { row = 7; bit = 0x10uy } ]).
Add(Keys.Escape, [ { row = 0; bit = 0x01uy };
{ row = 7; bit = 0x01uy } ]).
Add(Keys.Back, [ { row = 0; bit = 0x01uy };
{ row = 4; bit = 0x01uy } ]).
Add(Keys.Capital, [ { row = 0; bit = 0x01uy };
{ row = 3; bit = 0x02uy } ]).
Add(Keys.Oemplus, [ { row = 7; bit = 0x02uy };
{ row = 6; bit = 0x02uy } ]) // ctrl + L
let processor =
MailboxProcessor.Start(fun inbox ->
let rec nextMsg =
async {
let! msg = inbox.Receive()
match msg with
| KeyPressed key ->
if keyMap.ContainsKey(key) then
for k in keyMap.Item(key) do
ports.[k.row] <- ports.[k.row] &&& (k.bit ^^^ 0xFFuy)
return! nextMsg
| KeyReleased key ->
if keyMap.ContainsKey(key) then
for k in keyMap.Item(key) do
ports.[k.row] <- ports.[k.row] ||| k.bit
return! nextMsg
| ReadKeys (port, reply) ->
let result =
(byte (port >>> 8))
|> Seq.unfold (fun i -> Some(i, i >>> 1))
|> Seq.take 8
|> Seq.mapi (fun i port -> if port &&& 0x01uy = 0uy then ports.[i] else 0uy)
|> Seq.filter(fun i -> i > 0uy)
|> Seq.fold (fun r v -> r &&& v) 0xFFuy
reply.Reply(result)
return! nextMsg
}
nextMsg
)
interface IKeyboard with
member x.KeyPressed e = processor.Post(KeyPressed(e))
member x.KeyReleased e = processor.Post(KeyReleased(e))
interface IPort with
member x.read port = processor.PostAndReply(
(fun reply -> ReadKeys(port, reply)),
timeout = 200)
end
type DirectBitmapAccess(bitmap: Bitmap) =
let data = bitmap.LockBits(
new Rectangle(0, 0, bitmap.Width, bitmap.Height),
ImageLockMode.WriteOnly,
bitmap.PixelFormat)
let setPixel x y (r,g,b) =
let address =
NativePtr.add<byte> (NativePtr.ofNativeInt data.Scan0)
((y * data.Stride) + (x * 3))
NativePtr.write address b
NativePtr.set address 1 g
NativePtr.set address 2 r
member this.SetPixel(x, y, color: Color) =
setPixel x y (color.R, color.G, color.B)
interface IDisposable with
member this.Dispose() =
bitmap.UnlockBits(data)
type IVideoMemoryProcessor =
abstract ChangeFlash: unit
abstract DrawImage: byte[] -> unit
abstract GetImage: Image
type VideoMemoryProcessorMsg =
| DrawImage of byte[]
| GetImage of AsyncReplyChannel<Bitmap>
| Flash
type VideoMemoryProcessor() as this = class
let WIDTH = 256;
let HEIGHT = 192;
let CHAR_WIDTH_HEIGHT = 8;
let WIDTH_IN_CHARS = WIDTH / CHAR_WIDTH_HEIGHT;
let HEIGHT_IN_CHARS = HEIGHT / CHAR_WIDTH_HEIGHT;
let SCREEN_MEMORY_SIZE = WIDTH * HEIGHT / CHAR_WIDTH_HEIGHT;
let CONTENDED_MEMORY_START = 0x4000
let screens =
Array.init 2 (fun i -> new Bitmap(WIDTH, HEIGHT, PixelFormat.Format24bppRgb))
let mutable screen_index = 0
let mutable flash = 0x7Fuy;
let processor =
MailboxProcessor.Start(fun inbox ->
let rec nextMsg =
async {
let! msg = inbox.Receive()
match msg with
| GetImage(reply) ->
reply.Reply(screens.[(screen_index + 1) % 2])
return! nextMsg
| DrawImage bitmap ->
this.drawFrame bitmap
screen_index <- (screen_index + 1) % 2
return! nextMsg
| Flash ->
flash <- if flash = 0x7Fuy then 0xFFuy else 0x7Fuy
return! nextMsg
}
nextMsg
)
let COLORS =
Map.empty.
Add(0b0000, Color.FromArgb(0xFF, 0x00, 0x00, 0x00)).
Add(0b1110, Color.FromArgb(0xFF, 0xFF, 0xFF, 0x00)).
Add(0b0001, Color.FromArgb(0xFF, 0x00, 0x00, 0xC0)).
Add(0b1001, Color.FromArgb(0xFF, 0x00, 0x00, 0xFF)).
Add(0b0010, Color.FromArgb(0xFF, 0xC0, 0x00, 0x00)).
Add(0b1010, Color.FromArgb(0xFF, 0xFF, 0x00, 0x00)).
Add(0b0011, Color.FromArgb(0xFF, 0xC0, 0x00, 0xC0)).
Add(0b1011, Color.FromArgb(0xFF, 0xFF, 0x00, 0xFF)).
Add(0b0100, Color.FromArgb(0xFF, 0x00, 0xC0, 0x00)).
Add(0b1000, Color.FromArgb(0xFF, 0x00, 0x00, 0x00)).
Add(0b0101, Color.FromArgb(0xFF, 0x00, 0xC0, 0xC0)).
Add(0b1101, Color.FromArgb(0xFF, 0x00, 0xFF, 0xFF)).
Add(0b0110, Color.FromArgb(0xFF, 0xC0, 0xC0, 0x00)).
Add(0b1100, Color.FromArgb(0xFF, 0x00, 0xFF, 0x00)).
Add(0b0111, Color.FromArgb(0xFF, 0xC0, 0xC0, 0xC0)).
Add(0b1111, Color.FromArgb(0xFF, 0xFF, 0xFF, 0xFF))
member private x.drawFrame(memory: byte[]) =
using (new DirectBitmapAccess(screens.[screen_index])) (fun lockContext ->
for i in CONTENDED_MEMORY_START..(CONTENDED_MEMORY_START + SCREEN_MEMORY_SIZE - 1) do
let address = i - CONTENDED_MEMORY_START // 0x4000
let row = ((address &&& 0b0001100000000000) >>> 8) ||| ((address &&& 0b11100000) >>> 5)
let col = (address &&& 0b11111)
let line = ((address &&& 0b11100000000) >>> 8)
let attribute = memory.[CONTENDED_MEMORY_START
+ SCREEN_MEMORY_SIZE + row * WIDTH_IN_CHARS + col] &&& flash
let mutable ink = int ((attribute &&& 0b111uy) ||| ((attribute &&& 0b1000000uy) >>> 3))
let mutable paper = int ((attribute &&& 0b1111000uy) >>> 3)
if (attribute &&& 0x80uy) <> 0uy then
let tmp = ink
ink <- paper
paper <- tmp
let mutable x = 0
let mutable mask = 0b10000000uy
while mask > 0uy do
let xx = (col * CHAR_WIDTH_HEIGHT + x);
let yy = row * CHAR_WIDTH_HEIGHT + line;
let clr = COLORS.[if (memory.[i] &&& mask) = 0uy then paper else ink]
lockContext.SetPixel(xx, yy, clr)
mask <- mask >>> 1
x <- x + 1
)
interface IVideoMemoryProcessor with
member x.ChangeFlash = processor.Post(Flash)
member x.DrawImage bitmap = processor.Post(DrawImage bitmap)
member x.GetImage =
processor.PostAndReply(
(fun reply -> GetImage(reply)), timeout = 200) :> Image
end
type IDisplay =
abstract draw: byte[] -> uint16 -> unit
type Display(videoProcessor: IVideoMemoryProcessor) as this = class
inherit Panel(Dock = DockStyle.Fill)
do
this.DoubleBuffered <- true
this.Visible <- true
override x.OnPaint e =
e.Graphics.DrawImage(videoProcessor.GetImage, 0, 0)
interface IDisplay with
member x.draw (memory: byte[]) frame =
if frame % 16us = 0us then
videoProcessor.ChangeFlash
videoProcessor.DrawImage memory
x.Invalidate()
end
exception InstructionNotSupported of string
type Z80(keyboard: IPort) as this = class
let A = 0
let F = 1
let B = 2
let C = 3
let D = 4
let E = 5
let H = 6
let L = 7
let AS = 8
let FS = 9
let BS = 10
let CS = 11
let DS = 12
let ES = 13
let HS = 14
let LS = 15
let regs = [B; C; D; E; H; L; A]
let IX = 0
let IY = 1
let S_FLAG = 0b10000000uy
let Z_FLAG = 0b01000000uy
let X5_FLAG = 0b00100000uy
let H_FLAG = 0b00010000uy
let X3_FLAG = 0b00001000uy
let P_FLAG = 0b00000100uy
let V_FLAG = 0b00000100uy
let N_FLAG = 0b00000010uy
let C_FLAG = 0b00000001uy
let X53_FLAGS = X5_FLAG ||| X3_FLAG
let SZ_FLAGS = S_FLAG ||| Z_FLAG
let SZP_FLAGS = SZ_FLAGS ||| P_FLAG
let SZHN_FLAGS = SZ_FLAGS ||| H_FLAG ||| N_FLAG
let mutable ir = 0us
let mutable sp = 0us
let mutable pc = 0us
let register = Array.create 16 0uy
let index_register = Array.create 2 0us
let memory = Array.create (0xFFFF+1) 0xFFuy
let precomputed_flags =
Array.create 256 0uy |> Array.mapi (
fun i v -> (if i > 0x7F then S_FLAG else 0uy) |||
((byte i) &&& X53_FLAGS) |||
(if i = 0 then Z_FLAG else 0uy))
let sz53n_add = precomputed_flags
let sz53n_sub = precomputed_flags |> Array.map (fun v -> v ||| N_FLAG)
let powers_of_two = 1 |> Seq.unfold (fun i -> Some(i, i <<< 1))
let parity v len = powers_of_two |>
Seq.take len |>
Seq.fold (fun e i -> if i &&& v <> 0 then not e else e) true
let parityByte v = parity v 8
let sz53pn_add = sz53n_add |> Array.mapi (fun i v -> v ||| (if parityByte i then P_FLAG else 0uy))
let sz53pn_sub = sz53n_sub |> Array.mapi (fun i v -> v ||| (if parityByte i then P_FLAG else 0uy))
let halfcarry_add_table = [| false; true; true; true; false; false; false; true |]
let halfcarry_sub_table = [| false; false; true; false; true; false; true; true |]
let overflow_add_table = [| false; false; false; true; true; false; false; false |]
let overflow_sub_table = [| false; true; false; false; false; false; true; false |]
let SCREEN_CONTENTS = 128
let LEFT_BORDER = 24
let RIGHT_BORDER = 24
let RETRACE = 48
let SCREEN_CONTENTS_AND_BORDER_AND_RETRACE =
SCREEN_CONTENTS + RIGHT_BORDER + LEFT_BORDER + RETRACE
let TOTAL_LINES = 192
let PATTERN_LENGTH = 8
let TSTATE_START = 14335
let TSTATE_END =
TSTATE_START + SCREEN_CONTENTS_AND_BORDER_AND_RETRACE * TOTAL_LINES - 1
let CONTENDED_MEMORY_START = 0x4000us
let CONTENDED_MEMORY_END = 0x7FFFus
let FRAME_CYCLES_TOTAL = 69888
let mutable tstates = 0
let mutable frames = 0us
let mutable im = 0
let mutable ei = false
let mutable iff1 = false
let mutable iff2 = false
let mutable halt = false
let mutable intr = false
let MEMORY_READ_TIME = 3
let MEMORY_WRITE_TIME = 3
let OP_FETCH_TIME = 4
let MASK_8 = 0xFFuy
let operations =
Array.init 256 (fun i ->
(fun () -> raise (InstructionNotSupported("Unknown Instruction")) ))
let operations_extended =
Array.init 256 (fun i ->
(fun () -> raise (InstructionNotSupported("Unknown Extended Instruction")) ))
let operations_bits =
Array.init 256 (fun i ->
(fun () -> raise (InstructionNotSupported("Unknown Bit Instruction")) ))
let operations_indexes =
Array.init 256 (fun i ->
(fun (ireg: int) -> raise (InstructionNotSupported("Unknown Index Instruction")) ))
let operations_indexes_bits =
Array.init 256 (fun i -> (fun (address: uint16) (value: byte) ->
raise (InstructionNotSupported("Unknown Index Bit Instruction")) ))
do
this.initializeOperations
this.initializeExtendedOperations
this.initializeBitOperations
this.initializeIndexOperations
this.initializeIndexBitOperations
member x.Memory
with get() = memory
member x.Tstates
with get() = tstates
member x.Frames
with get() = frames
member x.R
with get() = byte ir
and set(v: byte) = ir <- (ir &&& 0xFF00us) ||| (uint16 v)
member x.I
with get() = byte (ir >>> 8)
and set(v: byte) = ir <- (ir &&& 0x00FFus) ||| ((uint16 v) <<< 8)
member x.Iff1
with get() = iff1
and set(v) = iff1 <- v
member x.Iff2
with get() = iff2
and set(v) = iff2 <- v
member x.loadRom(romFile: String) =
let rom = File.ReadAllBytes(romFile)
rom.CopyTo(memory, 0)
member x.get_contention_delay tstate =
match tstate with
| tstate when tstate < TSTATE_START || tstate > TSTATE_END -> 0
| _ -> let b_m = (tstate - TSTATE_START) % SCREEN_CONTENTS_AND_BORDER_AND_RETRACE
if b_m >= SCREEN_CONTENTS then 0 else
let delay = (PATTERN_LENGTH - (b_m % PATTERN_LENGTH)) - 2
if delay > 0 then delay else 0
member x.check_memory_contention (addr: uint16) =
tstates <- tstates + (if addr >= CONTENDED_MEMORY_START && addr <= CONTENDED_MEMORY_END
then x.get_contention_delay tstates
else 0)
member x.check_memory_contention_m (addr: uint16) times =
if addr >= CONTENDED_MEMORY_START && addr <= CONTENDED_MEMORY_END then
for i = 1 to times do
tstates <- tstates + 1 + x.get_contention_delay tstates
else
tstates <- tstates + times
member x.write_to_port (port: uint16) (value: byte) =
x.check_memory_contention port
tstates <- tstates + 1
if port &&& 0x0001us <> 0us then
x.check_memory_contention_m port 3
else
x.check_memory_contention port
tstates <- tstates + 3
member x.read_from_port (port: uint16) =
x.check_memory_contention port
tstates <- tstates + 1
if port &&& 0x0001us <> 0us then
x.check_memory_contention_m port 3
else
x.check_memory_contention port
tstates <- tstates + 3
if port &&& 0x00FFus = 0xFEus then
keyboard.read port
else
0xFFuy
member x.read_from_memory (addr: uint16) =
x.check_memory_contention addr
tstates <- tstates + MEMORY_READ_TIME
memory.[(int)addr]
member x.write_to_memory (addr: uint16) (data: byte) =
x.check_memory_contention addr
tstates <- tstates + MEMORY_WRITE_TIME
memory.[(int)addr] <- data
member x.increment_memory_refresh_register =
let r = ir &&& 0x00FFus
let r = (r &&& 0b10000000us) ||| ((r + 1us) &&& 0b1111111us)
ir <- (ir &&& 0xFF00us) ||| r
member x.get_compound (r1: byte) (r2: byte) = (uint16 r1 <<< 8) ||| (uint16 r2)
member x.push_to_stack (v: uint16) =
sp <- sp - 1us
x.write_to_memory sp (byte (v >>> 8))
sp <- sp - 1us
x.write_to_memory sp (byte v)
member x.pop_from_stack =
let addr1 = x.read_from_memory sp
sp <- sp + 1us
let addr2 = x.read_from_memory sp
sp <- sp + 1us
x.get_compound addr2 addr1
member x.interrupt =
if halt then
halt <- false
pc <- pc + 1us
tstates <- tstates + 7
x.increment_memory_refresh_register
iff1 <- false
iff2 <- false
x.push_to_stack pc
if im = 2 then
let i = (ir &&& 0xFF00us) >>> 8
let p = i <<< 8 ||| 0xFFus
let v1 = x.read_from_memory p
let v2 = x.read_from_memory (p + 1us)
let v = x.get_compound v2 v1
pc <- v
else
pc <- 0x38us
member x.read_next_instruction =
x.check_memory_contention pc
tstates <- tstates + OP_FETCH_TIME
memory.[(int)pc]
member public x.execute_next_instruction() =
x.increment_memory_refresh_register
let op = x.read_next_instruction
pc <- pc + 1us
operations.[(int)op]()
member x.execute utstates =
while tstates < utstates do
if intr && iff1 && (not ei) then
x.interrupt
x.execute_next_instruction()
if ei then ei <- false
member x.execute_frame =
if tstates < 32 then
intr <- true
x.execute 32
intr <- false
x.execute(FRAME_CYCLES_TOTAL)
tstates <- tstates % FRAME_CYCLES_TOTAL
frames <- frames + 1us
memory
member x.initializeOperations =
operations.[0x00] <- fun () -> ()
operations.[0x07] <- fun () ->
let cf = if (register.[A] &&& 0x80uy) <> 0uy then C_FLAG else 0uy
register.[A] <- (register.[A] <<< 1) ||| cf
register.[F] <- (register.[F] &&& SZP_FLAGS) ||| (register.[A] &&& X53_FLAGS) ||| cf
operations.[0x08] <- fun () ->
x.exchange_registers A AS
x.exchange_registers F FS
operations.[0x0F] <- fun () ->
let cf = register.[A] &&& 0x01uy
register.[A] <- (register.[A] >>> 1) ||| (cf <<< 7)
register.[F] <- (register.[F] &&& SZP_FLAGS) ||| (register.[A] &&& X53_FLAGS) ||| cf
operations.[0x10] <- fun () ->
x.check_memory_contention_m ir 1
register.[B] <- (register.[B] - 1uy)
if register.[B] <> 0uy then
let offset = x.get_signed_byte(x.read_from_memory pc)
x.check_memory_contention_m pc 5
pc <- uint16 (int pc + offset + 1)
else
pc <- pc + 1us
operations.[0x16] <- fun () ->
register.[D] <- x.read_from_memory pc
pc <- pc + 1us
operations.[0x17] <- fun () ->
let cf = if (register.[A] &&& 0x80uy) <> 0uy then C_FLAG else 0uy
register.[A] <- ((register.[A] <<< 1) &&& 0xFEuy) ||| (register.[F] &&& C_FLAG)
register.[F] <- (register.[F] &&& SZP_FLAGS) ||| (register.[A] &&& X53_FLAGS) ||| cf
operations.[0x18] <- fun () ->
let offset = x.get_signed_byte(x.read_from_memory pc)
x.check_memory_contention_m pc 5
pc <- uint16 (int pc + offset + 1)
operations.[0x1F] <- fun () ->
let cf = if register.[A] &&& 0x01uy <> 0uy then C_FLAG else 0uy
register.[A] <- ((register.[A] >>> 1) &&& MASK_8) ||| ((register.[F] &&& C_FLAG) <<< 7)
register.[F] <- (register.[F] &&& SZP_FLAGS) ||| (register.[A] &&& X53_FLAGS) ||| cf
operations.[0x22] <- fun () ->
let offset = x.read_address_pointing_by_pc
x.write_to_memory offset register.[L]
x.write_to_memory (offset + 1us) register.[H]
operations.[0x27] <- fun () ->
let cf = register.[F] &&& C_FLAG
let correction = if (register.[F] &&& C_FLAG <> 0uy) || (register.[A] > 0x99uy)
then 0x60uy else 0x00uy
let correction = correction |||
(if ((register.[F] &&& H_FLAG <> 0uy) ||
((register.[A] &&& 0x0Fuy) > 0x09uy))
then 0x06uy else 0x00uy)
let cf = if register.[A] > 0x99uy then C_FLAG else cf
if register.[F] &&& N_FLAG <> 0uy then
x.sub_from_register A correction
register.[F] <- sz53pn_sub.[int register.[A]] ||| (register.[F] &&& H_FLAG) ||| cf
else
x.add_to_register A correction
register.[F] <- sz53pn_add.[int register.[A]] ||| (register.[F] &&& H_FLAG) ||| cf
operations.[0x2A] <- fun () ->
let offset = x.read_address_pointing_by_pc
register.[L] <- x.read_from_memory offset
register.[H] <- x.read_from_memory (offset + 1us)
operations.[0x2F] <- fun () ->
register.[A] <- register.[A] ^^^ MASK_8
register.[F] <- (register.[F] &&& SZP_FLAGS) |||
H_FLAG |||
(register.[A] &&& X53_FLAGS) |||
N_FLAG |||
(register.[F] &&& C_FLAG)
operations.[0x31] <- fun () ->
sp <- x.read_address_pointing_by_pc
operations.[0x32] <- fun () ->
x.write_to_memory x.read_address_pointing_by_pc register.[A]
operations.[0x36] <- fun () ->
x.write_to_memory (x.get_register16 H L) (x.read_from_memory pc)
pc <- pc + 1us
operations.[0x37] <- fun () ->
register.[F] <- (register.[F] &&& SZP_FLAGS) |||
(register.[A] &&& X53_FLAGS) ||| C_FLAG
operations.[0x3A] <- fun () ->
let offset = x.read_address_pointing_by_pc
register.[A] <- x.read_from_memory offset
operations.[0x3F] <- fun () ->
register.[F] <- (register.[F] &&& SZP_FLAGS) |||
(register.[A] &&& X53_FLAGS) |||
(if (register.[F] &&& C_FLAG) <> 0uy then H_FLAG else C_FLAG)
operations.[0x76] <- fun () ->
halt <- true
pc <- pc - 1us
operations.[0xC3] <- fun () ->
pc <- x.read_address_pointing_by_pc
operations.[0xC9] <- fun () ->
pc <- x.pop_from_stack
operations.[0xCB] <- fun () ->
x.increment_memory_refresh_register
let op = int x.read_next_instruction
pc <- pc + 1us
operations_bits.[op]()
operations.[0xCD] <- fun () ->
let offset = x.read_address_pointing_by_pc
x.check_memory_contention_m (pc - 1us) 1
x.push_to_stack pc
pc <- offset
operations.[0xD3] <- fun () ->
let value = x.read_from_memory pc
x.write_to_port (x.get_compound register.[A] value) register.[A]
pc <- pc + 1us
operations.[0xD9] <- fun () ->
x.exchange_registers B BS
x.exchange_registers C CS
x.exchange_registers D DS
x.exchange_registers E ES
x.exchange_registers H HS
x.exchange_registers L LS
operations.[0xDB] <- fun () ->
register.[A] <- x.read_from_port (x.get_compound register.[A] (x.read_from_memory pc))
pc <- pc + 1us
operations.[0xDD] <- fun () ->
x.increment_memory_refresh_register
let op = int x.read_next_instruction
pc <- pc + 1us
operations_indexes.[op] IX
operations.[0xE3] <- fun () ->
let curr_h = register.[H]
let curr_l = register.[L]
register.[L] <- x.read_from_memory sp
register.[H] <- x.read_from_memory (sp + 1us)
x.check_memory_contention_m (sp + 1us) 1
x.write_to_memory sp curr_l
x.write_to_memory (sp + 1us) curr_h
x.check_memory_contention_m sp 2
operations.[0xE9] <- fun () ->
pc <- x.get_register16 H L
operations.[0xEB] <- fun () ->
x.exchange_registers D H
x.exchange_registers E L
operations.[0xED] <- fun () ->
x.increment_memory_refresh_register
let op = int x.read_next_instruction
pc <- pc + 1us
operations_extended.[op]()
operations.[0xF3] <- fun () ->
iff1 <- false
iff2 <- false
operations.[0xF9] <- fun () ->
x.check_memory_contention_m ir 2
sp <- x.get_register16 H L
operations.[0xFB] <- fun () ->
ei <- true
iff1 <- true
iff2 <- true
operations.[0xFD] <- fun () ->
x.increment_memory_refresh_register
let op = int x.read_next_instruction
pc <- pc + 1us
operations_indexes.[op] IY
[(0x01, [B; C]); (0x11, [D; E]); (0x21, [H; L])] |> List.iter
(fun c ->
match c with
| (op, reg) ->
operations.[op] <- fun () ->
reg |> List.rev |> List.iter (fun reg_half ->
register.[reg_half] <- x.read_from_memory pc
pc <- pc + 1us))
[(0x02, [B; C]); (0x12, [D; E])] |> List.iter
(fun c ->
match c with
| (op, [reg1; reg2]) ->
operations.[op] <- fun () ->
x.write_to_memory (x.get_register16 reg1 reg2) register.[A]
| (_, _) -> ()
)
[(0x33, +1); (0x3B, -1)] |> List.iter (fun c ->
match c with
| (op, offset) -> operations.[op] <- fun () ->
x.check_memory_contention_m ir 2
sp <- uint16 (int sp + offset))
[
(0x03, [B;C], +1)
(0x13, [D;E], +1)
(0x23, [H;L], +1)
(0x0B, [B;C], -1)
(0x1B, [D;E], -1)
(0x2B, [H;L], -1)
] |> List.iter (fun c ->
match c with
| (op, [reg1; reg2], offset) ->
operations.[op] <- fun () ->
x.check_memory_contention_m ir 2
let r = uint16 (int (x.get_register16 reg1 reg2) + offset)
register.[reg1] <- byte (r >>> 8)
register.[reg2] <- byte r
| (_, _, _) -> ()
)
let get_ops_with_regs ops regs = List.zip ops regs
let get_ops ops regs f = (get_ops_with_regs ops regs) |> List.map (fun (a, b) -> (a, b, f))
let ops1 = get_ops (List.append [0x04 .. 0x08 .. 0x2C] [0x3C]) regs x.inc_reg_8
let ops2 = get_ops (List.append [0x05 .. 0x08 .. 0x2D] [0x3D]) regs x.dec_reg_8
List.append ops1 ops2 |> List.iter (fun c ->
match c with
| (op, reg, f) ->
operations.[op] <- fun () -> f reg
)
get_ops_with_regs (List.append [0x06 .. 0x08 .. 0x2E] [0x3E]) regs |> List.iter (fun c ->
match c with
| (op, reg) ->
operations.[op] <- fun () ->
register.[reg] <- x.read_from_memory pc
pc <- pc + 1us
)
[(0x09, [B;C]); (0x19, [D;E]); (0x29, [H;L]); (0x39, [])] |> List.iter (fun c ->
match c with
| (op, [reg1; reg2]) ->
operations.[op] <- fun () ->
x.check_memory_contention_m ir 7
x.add_to_register16 H L (x.get_register16 reg1 reg2)
| (op, _) ->
operations.[op] <- fun () ->
x.check_memory_contention_m ir 7
x.add_to_register16 H L sp
)
[
(0x20, (Z_FLAG, false))
(0x30, (C_FLAG, false))
(0x28, (Z_FLAG, true))
(0x38, (C_FLAG, true))
] |> List.iter (fun c->
match c with
| (op, (flag, exp_flag_value)) ->
operations.[op] <- fun () ->
let offset = x.get_signed_byte (x.read_from_memory pc)
let flag_value = register.[F] &&& flag > 0uy
if flag_value = exp_flag_value then
x.check_memory_contention_m pc 5
pc <- uint16 (int pc + offset + 1)
else
pc <- pc + 1us
)
[
(0x34, x.inc_with_flags8)
(0x35, x.dec_with_flags8)
] |> List.iter (fun c ->
match c with
| (op, f) ->
operations.[op] <- fun () ->
let hl = x.get_register16 H L
let value = f (x.read_from_memory hl)
x.check_memory_contention_m hl 1
x.write_to_memory hl value
)
[
(0x0A, [B;C])
(0x1A, [D;E])
] |> List.iter (fun c ->
match c with
|(op, [reg1; reg2]) ->
operations.[op] <- fun () ->
register.[A] <- x.read_from_memory (x.get_register16 reg1 reg2)
|(_, _) -> ()
)
[
([0x40..0x47], B)
([0x48..0x4F], C)
([0x50..0x57], D)
([0x58..0x5F], E)
([0x60..0x67], H)
([0x68..0x6F], L)
([0x78..0x7F], A)
] |> List.iter (fun c ->
match c with
| (ops, dest_reg) ->
List.zip ops [B;C;D;E;H;L;-1;A] |> List.iter (fun y ->
match y with
| (op, src_reg) ->
operations.[op] <-
if src_reg <> -1 then
fun () -> register.[dest_reg] <- register.[src_reg]
else
fun () -> register.[dest_reg] <- x.read_from_memory (x.get_register16 H L)
)
)
List.zip (List.append [0x70..0x75] [0x77]) regs |> List.iter (fun c ->
match c with
|(op, src_reg) ->
operations.[op] <- fun () ->
x.write_to_memory (x.get_register16 H L) register.[src_reg]
)
[
([0x80..0x87], x.add_to_register)
([0x88..0x8F], x.add_to_register_with_carry)
([0x90..0x97], x.sub_from_register)
([0x98..0x9F], x.sub_from_register_with_carry)
([0xa0..0xA7], x.and_register)
([0xa8..0xAF], x.xor_register)
([0xb0..0xB7], x.or_register)
([0xb8..0xBF], x.cp_to_register)
] |> List.iter (fun c ->
match c with
| (ops, f) ->
List.zip ops [B;C;D;E;H;L;-1;A] |> List.iter (fun y ->
match y with
| (op, src_reg) ->
operations.[op] <-
if src_reg <> -1 then
fun () -> f A register.[src_reg]
else
fun () -> f A (x.read_from_memory (x.get_register16 H L))
)
)
[
(0xC0, (Z_FLAG, false))
(0xD0, (C_FLAG, false))
(0xE0, (P_FLAG, false))
(0xF0, (S_FLAG, false))
(0xC8, (Z_FLAG, true))
(0xD8, (C_FLAG, true))
(0xE8, (P_FLAG, true))
(0xF8, (S_FLAG, true))
] |> List.iter (fun c ->
match c with
| (op, (flag, exp_flag_value)) ->
operations.[op] <- fun () ->
x.check_memory_contention_m ir 1
let flag_value = register.[F] &&& flag > 0uy
if flag_value = exp_flag_value then
pc <- x.pop_from_stack
)
[
(0xC1,[B;C])
(0xD1,[D;E])
(0xE1,[H;L])
(0xF1,[A;F])
] |> List.iter (fun c ->
match c with
|(op, [reg1;reg2]) ->
operations.[op] <- fun () ->
let v = x.pop_from_stack
register.[reg1] <- byte (v >>> 8)
register.[reg2] <- byte v
| (_, _) -> ()
)
[
(0xC2,(Z_FLAG, false))
(0xD2,(C_FLAG, false))
(0xE2,(P_FLAG, false))
(0xF2,(S_FLAG, false))
(0xCA,(Z_FLAG, true))
(0xDA,(C_FLAG, true))
(0xEA,(P_FLAG, true))
(0xFA,(S_FLAG, true))
] |> List.iter (fun c ->
match c with
| (op, (flag, exp_flag_value)) ->
operations.[op] <- fun () ->
let offset1 = x.read_from_memory pc
pc <- pc + 1us
let offset2 = x.read_from_memory pc
pc <- pc + 1us
let offset = x.get_compound offset2 offset1
let flag_value = register.[F] &&& flag > 0uy
if flag_value = exp_flag_value then
pc <- offset
)
[
(0xC4,(Z_FLAG, false))
(0xD4,(C_FLAG, false))
(0xE4,(P_FLAG, false))
(0xF4,(S_FLAG, false))
(0xCC,(Z_FLAG, true))
(0xDC,(C_FLAG, true))
(0xEC,(P_FLAG, true))
(0xFC,(S_FLAG, true))
] |> List.iter (fun c ->
match c with
| (op, (flag, exp_flag_value)) ->
operations.[op] <- fun () ->
let offset1 = x.read_from_memory pc
let offset2 = x.read_from_memory (pc + 1us)
let offset = x.get_compound offset2 offset1
let flag_value = register.[F] &&& flag > 0uy
if flag_value = exp_flag_value then
pc <- pc + 1us
x.check_memory_contention_m pc 1
pc <- pc + 1us
x.push_to_stack pc
pc <- offset
else
pc <- pc + 2us
)
[
(0xC5, [B;C])
(0xD5, [D;E])
(0xE5, [H;L])
(0xF5, [A;F])
] |> List.iter (fun c ->
match c with
| (op, [reg1;reg2]) ->
operations.[op] <- fun () ->
x.check_memory_contention_m ir 1
x.push_to_stack (x.get_register16 reg1 reg2)
| (_, _) -> ()
)