Implement interrupt status register

Upon an interrupt, you can read from the interrupt status register to see what caused the interrupt.
2022-03-14 13:30:01 -05:00
parent e012eb7d4d
commit a5474b5ae5
5 changed files with 46 additions and 1 deletions
--- a/sw/io.inc65
+++ b/sw/io.inc65
@@ -4,3 +4,5 @@ UART        = $7ff4
 UART_TXB    = UART
 UART_RXB    = UART
 UART_STATUS = UART + 1
+
+IRQ_STATUS  = $7fff