+ added 8253 and 8254 (aliases of 82C54)

library/intel.dcm

@@ -87,6 +87,18 @@ D Universal Asynchronous Receiver/Transmitter, PDIP-28
 K UART Serial Interface
 $ENDCMP
 #
+$CMP 8253
+D Programmable Interval Timer, PDIP-24
+K Timer Counter
+F http://www.cpcwiki.eu/imgs/e/e3/8253.pdf
+$ENDCMP
+#
+$CMP 8254
+D Programmable Interval Timer, PDIP-24
+K Timer Counter
+F http://www.scs.stanford.edu/10wi-cs140/pintos/specs/8254.pdf
+$ENDCMP
+#
 $CMP 8255
 D Programmable Peripheral Interface, PDIP-40
 K 8255 PPI

library/intel.lib

@@ -731,6 +731,7 @@ F0 "U" -450 900 50 H V L CNN
 F1 "82C54" 100 900 50 H V L CNN
 F2 "Housings_DIP:DIP-24_W15.24mm" 50 250 50 H I C CNN
 F3 "" -450 900 50 H I C CNN
+ALIAS 8254 8253
 $FPLIST
  DIP*W15.24mm*
  PDIP*W15.24mm*