The Cricket!: further refinements to 'SSC init' (#18)

//c technical reference includes a 'hardware reset' for three of the ACIA registers. Here we reset all three.
2023-07-16 13:30:04 -07:00 · 2023-07-16 13:30:04 -07:00 · 9401723f0d
parent ec4a0eeb1e
commit 9401723f0d
1 changed files with 2 additions and 1 deletions
--- a/clocks/cricket/cricket.system.s
+++ b/clocks/cricket/cricket.system.s
@ -81,8 +81,9 @@ init_ssc:
        ;; Reset SSC
        sta     KBDSTRB         ; Port 2 DSR line connected to KBDSTRB
        lda     #0
-        sta     COMMAND
+        sta     COMMAND         ; hardware reset all Port 2 ACIA registers
        sta     CONTROL
+        sta     STATUS

        ;; Configure SSC
        lda     #%00001011      ; no parity/echo/interrupts, RTS low, DTR low