diff --git a/SANDBOX.PO b/SANDBOX.PO
index 1750d02..49fedfe 100644
Binary files a/SANDBOX.PO and b/SANDBOX.PO differ
diff --git a/src/libsrc/portio.pla b/src/libsrc/portio.pla
new file mode 100644
index 0000000..6f7efda
--- /dev/null
+++ b/src/libsrc/portio.pla
@@ -0,0 +1,53 @@
+//
+// Game port I/O library based on the wiring library
+//
+import cmdsys
+    predef syscall, call, getc, gets, putc, puts, putln
+    predef memset, memcpy, modaddr, modexec
+    predef heapmark, heapallocalign, heapalloc, heaprelease
+    predef isugt, isuge, isult, isule
+    byte MACHID
+end
+
+const ANN0   = $C058
+const ANN1   = $C05A
+const ANN2   = $C05C
+const ANN3   = $C05E
+const OFF    = 0
+const ON     = 1
+const STROBE = $C040
+const FLAG0  = $C060
+const FLAG1  = $C061
+const FLAG2  = $C062
+const FLAG3  = $C063
+const PREAD  = $FB1E
+const WAIT   = $FCA8
+
+export def digitalRead(pin)
+  return FLAG0[pin&3] > 127
+end
+
+export def portRead
+  return (^FLAG0>>7)&1|(^FLAG1>>6)&2|(^FLAG2>>5)&4|(^FLAG3>>4)&8
+end
+
+def digitalWrite(pin, val)
+  return ^ANN0[pin&3+val&1]
+end
+
+export def portWrite(val)
+  ^ANN0[val&1]
+  ^ANN1[(val>>1)&1]
+  ^ANN2[(val>>2)&1]
+  return ^ANN3[(val>>3)&1]
+end
+
+export def analogRead(pin)
+  return call(PREAD,0,pin&3,0,0).2
+end
+
+export def delay(time)
+  return call(WAIT,time,0,0,0)
+end
+
+done
diff --git a/src/makefile b/src/makefile
index 6d1917b..a2aa05b 100644
--- a/src/makefile
+++ b/src/makefile
@@ -18,6 +18,7 @@ DHCP    = DHCP\#FE1000
 HTTPD   = HTTPD\#FE1000
 DGR     = DGR\#FE1000
 TONE    = TONE\#FE1000
+PORTIO  = PORTIO\#FE1000
 ROGUE   = ROGUE\#FE1000
 ROGUEIO = ROGUEIO\#FE1000
 ROGUEMAP= ROGUEMAP\#FE1000
@@ -52,7 +53,7 @@ TXTTYPE	= .TXT
 #SYSTYPE	= \#FF2000
 #TXTTYPE	= \#040000
 
-all: $(PLASM) $(PLVM) $(PLVM01) $(PLVM02) $(PLVM03) $(CMD) $(MEMMGR) $(MEMTEST) $(FIBER) $(SB) $(MON) $(ROD) $(SIEVE) $(UTHERNET2) $(UTHERNET) $(ETHERIP) $(INET) $(DHCP) $(HTTPD) $(ROGUE) $(ROGUEMAP) $(ROGUECOMBAT) $(ROGUEIO) $(HGR1) $(TONE) $(DGR) $(DGRTEST)
+all: $(PLASM) $(PLVM) $(PLVM01) $(PLVM02) $(PLVM03) $(CMD) $(MEMMGR) $(MEMTEST) $(FIBER) $(SB) $(MON) $(ROD) $(SIEVE) $(UTHERNET2) $(UTHERNET) $(ETHERIP) $(INET) $(DHCP) $(HTTPD) $(ROGUE) $(ROGUEMAP) $(ROGUECOMBAT) $(ROGUEIO) $(HGR1) $(TONE) $(DGR) $(DGRTEST) $(PORTIO)
 
 clean:
 	-rm *FE1000 *FF2000 $(PLASM) $(PLVM) $(PLVM01) $(PLVM02) $(PLVM03)
@@ -161,6 +162,10 @@ $(TONE): libsrc/tone.pla $(PLVM02) $(PLASM)
 	./$(PLASM) -AM < libsrc/tone.pla > libsrc/tone.a
 	acme --setpc 4094 -o $(TONE) libsrc/tone.a
 
+$(PORTIO): libsrc/portio.pla $(PLVM02) $(PLASM)
+	./$(PLASM) -AM < libsrc/portio.pla > libsrc/portio.a
+	acme --setpc 4094 -o $(PORTIO) libsrc/portio.a
+
 $(DGR): libsrc/dgr.pla $(PLVM02) $(PLASM)
 	./$(PLASM) -AM < libsrc/dgr.pla > libsrc/dgr.a
 	acme --setpc 4094 -o $(DGR) libsrc/dgr.a