better font rendering and start of z80 access

core_comm.c

@@ -0,0 +1,20 @@
+#include "core_comm.h"
+
+#include "pico/multicore.h"
+#include "pico/platform.h"
+
+bool core1_to_core0_try_write(uint32_t data) {
+    hard_assert(get_core_num() == 1);
+    return multicore_fifo_push_timeout_us(data, 0);
+}
+
+void core1_to_core0_write_blocking(uint32_t data) {
+    hard_assert(get_core_num() == 1);
+    multicore_fifo_push_blocking(data);
+}
+
+bool core0_try_read_from_core1(uint32_t *data) {
+    hard_assert(get_core_num() == 0);
+    hard_assert(data != NULL);
+    return multicore_fifo_pop_timeout_us(0, data);
+}