better font rendering and start of z80 access

2026-08-30 11:59:05 +02:00
parent 793c816148
commit 073a538794
28 changed files with 2960 additions and 44 deletions
--- a/z80_bus.pio
+++ b/z80_bus.pio
@@ -0,0 +1,10 @@
+.program z80_write_monitor
+.wrap_target
+    wait 0 gpio 10        ; /IOREQ asserted
+    mov isr, null
+    ; IN base is GP0. Capture /OE, DIR, D0-D7, /IOREQ, /RD, CS,
+    ; A0 and A1 in their corresponding GPIO bit positions.
+    in pins, 15
+    push block
+    wait 1 gpio 10        ; do not count this bus cycle again
+.wrap