Filtering out arrow keys from the USB keyboard on the nano6502

davidgiven · Oct 12, 2024 · 10ed7df · 10ed7df
1 parent 0c92f7b
commit 10ed7df
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/src/arch/nano6502/nano6502.S b/src/arch/nano6502/nano6502.S
@@ -313,7 +313,7 @@ zproc tty_conin
     lda pending_key
     zif_eq
 tty_input_wait:
-	lda #IO_page_uart
+	    lda #IO_page_uart
         sta IO_page_reg
         lda uart_rx_avail
         beq tty_input_keyb
@@ -326,6 +326,11 @@ tty_input_keyb:
         lda keyb_data_avail
         beq tty_input_wait
         lda keyb_data
+        ; Filter out arrow keys
+        cmp #$80
+        zif_cs
+            lda #0
+        zendif
         clc
         rts
     zendif