1 files changed, 51 insertions, 6 deletions
diff --git a/src/Device.hs b/src/Device.hs
index 50fb3fc..2e099dc 100644
--- a/src/Device.hs
+++ b/src/Device.hs
@@ -5,12 +5,57 @@ import Data.Word (Word32, Word16, Word8)
 import Machine
 
 
-data DeviceRequest = DeviceGetByte Long
-                   | DeviceGetWord Long
-                   | DeviceGetLong Long
-                   | DeviceSetByte Long Byte
-                   | DeviceSetWord Long Word
-                   | DeviceSetLong Long Long
+-------------------------------------------------------------------------------
+-- Protocol Constants
+-- Protocol itself is simple,
+-- suem send commands to devices, they response.
+-- Example communication:
+-- s: h afebabe
+-- d: o 07
+-- s: W afebabe 1999
+-- d: o
+-- d: i
+-- s: l afebab3
+-- d: x
+-- All numbers are in hex and have correct length
+-- (zeroes on the left are mandatory).
+
+-- requests
+device_get_high_byte = 'h' -- <7 hexes>; 2 hexes in response
+device_get_low_byte  = 'l' -- <7 hexes>; 2 hexes in response
+device_get_word      = 'w' -- <7 hexes>; 4 hexes in response
+
+device_set_high_byte = 'H' -- <7 hexes> <2 hexes>
+device_set_low_byte  = 'L' -- <7 hexes> <2 hexes>
+device_set_word      = 'W' -- <7 hexes> <4 hexes>
+
+-- responses
+device_interrupt = 'i' -- and nothing else
+device_ok        = 'o' -- maybe number in response to get (with correct size)
+device_bad       = 'x' -- and nothing else =)
+
+
+-------------------------------------------------------------------------------
+-- Memory
+
+deviceGetByte :: Long -> Emulator Byte
+deviceGetByte a | a `mod` 2 == 0 = return 0xFF
+                | otherwise = return 0xFF
+
+deviceGetWord :: Long -> Emulator Word
+deviceGetWord a = return 0xFFFF
+
+
+deviceSetByte :: Long -> Byte -> Emulator ()
+deviceSetByte a b | a `mod` 2 == 0 = return ()
+                  | otherwise = return ()
+
+deviceSetWord :: Long -> Word -> Emulator ()
+deviceSetWord a w = return ()
+
+
+-------------------------------------------------------------------------------
+-- Interrupts
 
 checkInteruptsFromDevices :: Emulator ()
 checkInteruptsFromDevices = return ()