1 files changed, 9 insertions, 24 deletions

diff --git a/source/seta018.c b/source/seta018.c
index 840e479..a608960 100644
--- a/source/seta018.c
+++ b/source/seta018.c
@@ -5,15 +5,11 @@
 
 ST018_Regs ST018;
 
-static int32_t line; // line counter
-
 uint8_t S9xGetST018(uint32_t Address)
 {
    uint8_t t = 0; // Initialise to some value for the compiler
    uint16_t address = (uint16_t) Address & 0xFFFF;
 
-   line++;
-
    // these roles may be flipped
    // op output
    if (address == 0x3804)
@@ -28,8 +24,7 @@ uint8_t S9xGetST018(uint32_t Address)
       else
          t = 0x81;
    }
-   // status register
-   else if (address == 0x3800)
+   else if (address == 0x3800) // status register
       t = ST018.status;
 
    return t;
@@ -39,26 +34,20 @@ void S9xSetST018(uint8_t Byte, uint32_t Address)
 {
    uint16_t address = (uint16_t) Address & 0xFFFF;
    static bool reset = false;
-   line++;
 
-   if (!reset)
+   if (!reset) // bootup values
    {
-      // bootup values
       ST018.waiting4command = true;
       ST018.part_command = 0;
       reset = true;
    }
 
    Memory.SRAM[address] = Byte;
+   ST018.status = 0x00; // default status for now
 
-   // default status for now
-   ST018.status = 0x00;
-
-   // op data goes through this address
-   if (address == 0x3804)
+   if (address == 0x3804) // op data goes through this address
    {
-      // check for new commands: 3 bytes length
-      if (ST018.waiting4command && ST018.part_command == 2)
+      if (ST018.waiting4command && ST018.part_command == 2) // check for new commands: 3 bytes length
       {
          ST018.waiting4command = false;
          ST018.command <<= 8;
@@ -78,32 +67,28 @@ void S9xSetST018(uint8_t Byte, uint32_t Address)
             break;
          }
       }
-      else if (ST018.waiting4command)
+      else if (ST018.waiting4command) // 3-byte commands
       {
-         // 3-byte commands
          ST018.part_command++;
          ST018.command <<= 8;
          ST018.command |= Byte;
       }
    }
-   // extra parameters
-   else if (address == 0x3802)
+   else if (address == 0x3802) // extra parameters
    {
       ST018.parameters[ST018.in_index] = Byte;
       ST018.in_index++;
    }
 
-   if (ST018.in_count == ST018.in_index)
+   if (ST018.in_count == ST018.in_index) // Actually execute the command
    {
-      // Actually execute the command
       ST018.waiting4command = true;
       ST018.in_index = 0;
       ST018.out_index = 0;
       switch (ST018.command)
       {
-      // hardware check?
       case 0x0100:
-      case 0xFF00:
+      case 0xFF00: // hardware check?
          ST018.waiting4command = false;
          ST018.pass++;
          if (ST018.pass == 1)