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+You can access the memory locations but you
+obviously couldn't expect to have an interrupt point to byte code. I've
+used the green LED in many of my projects in bytecode.
+exp:
+<code c>
+ #define LED (*(char *)0xFFFF61) // Green LED register
+ void more(void)
+ {
+  LED |= 8; // Turn Green LED ON
+  _getch();
+  LED &= 247; // Turn Green LED OFF
+              // or more succinctly
+  LED &= ~8;
+ }
+</code>
+For a map of the ports see [[H8PortMap]]
+{{portTester.zip}} is demonstration program that runs against the Cybiko CONSOLE that makes various called against the H8 PORTS.
+A source of the portTester program is shown below:
+<code c>
+ #include <cybiko.h>
+ struct module_t main_module;
+ #define PORT2  0xFFFF61
+ #define GREENLED 0x08   // 3 - TMCI0
+ #define REDLED   0x04   // 2 - TMRI0
+ #define PORT4 0xFFFF53
+ #define PORT4_MASK 0x0f    // Only bottom 4 bits are valid
+ #define AN3     0x04   // 3 - AN3 - NC
+ #define BATLEV1 0x02   // 2 - AN2 - battery level
+ #define BATLEV2 0x01   // 1 - AN1 - battery level
+ #define RFLEV   0x00   // 0 - AN0 - RF Signal Strength
+ #define  HD66421_SET (*(char *)0x600000)
+ #define  HD66421_USE (*(char *)0x600001)
+ #define  CR1_BASE 0x59  // Default state for Control register 1
+ #define  CR1_DISP 0x40
+ #define  CR1_STBY 0x10
+ #define  CR1_RVRS 0x04
+ void togglePort(long port, short mask, char *text) {
+        TRACE("Enable %s",text);
+        (*(char *)port) |= mask;
+        sleep(2000);
+        TRACE("Disable %s",text);
+        (*(char *)port) &= ~mask;
+        sleep(2000);
+ }
+ /**
+ * Main entry point
+ */
+ long main(int argc, char* argv[], bool start)
+ {
+        char port4;
+        char batlev;
+        init_module( &main_module );
+        TRACE("Direct port access demonstration");
+        sleep(1000);
+        // NOTE: If you have the cybiko running on MAINS
+        //       then you will not see the red LED toggle.
+        togglePort(PORT2, GREENLED, "Green LED");
+        togglePort(PORT2, REDLED, "Red LED");
+        togglePort(PORT2, REDLED|GREENLED, "Red&Green LED");
+        port4 = (*(char *)PORT4) & PORT4_MASK;
+        TRACE("RF Strength %d", port4 & RFLEV);
+        batlev = (port4 & (BATLEV1 | BATLEV2)) >> 1; // normalize to 0-3
+        TRACE("Battery level %d", batlev);
+        HD66421_SET = 0x00;  // Control reg 1
+        HD66421_USE = CR1_BASE | CR1_STBY;  // LCD On
+        TRACE("Reverse Display");
+        HD66421_SET = 0x00;  // Control reg 1
+        HD66421_USE = CR1_BASE | CR1_RVRS;  // Reverse Video
+        sleep(2000);
+        HD66421_SET = 0x00;  // Control reg 1
+        HD66421_USE = CR1_BASE & ~CR1_RVRS;  // Normal Video
+        TRACE("done");
+        return 0L;
+ }
+</code>
+{{tag>cybiko}}