+ unsigned char d = 0;
+
+ elprintf(EL_ANOMALY, "z80 port %04x read", a);
+ a &= 0xc1;
+ switch (a)
+ {
+ case 0x00:
+ case 0x01:
+ d = 0xff;
+ break;
+
+ case 0x40: /* V counter */
+ d = Pico.video.v_counter;
+ break;
+
+ case 0x41: /* H counter */
+ d = Pico.m.rotate++;
+ break;
+
+ case 0x80:
+ d = vdp_data_read();
+ break;
+
+ case 0x81:
+ d = vdp_ctl_read();
+ break;
+
+ case 0xc0: /* I/O port A and B */
+ d = ~((PicoPad[0] & 0x3f) | (PicoPad[1] << 6));
+ break;
+
+ case 0xc1: /* I/O port B and miscellaneous */
+ d = (Pico.sms_io_ctl & 0x80) | ((Pico.sms_io_ctl << 1) & 0x40) | 0x30;
+ d |= ~(PicoPad[1] >> 2) & 0x0f;
+ break;
+ }
+
+ elprintf(EL_ANOMALY, "ret = %02x", d);
+ return d;
+}
+
+static void z80_sms_out(unsigned short a, unsigned char d)
+{
+ elprintf(EL_ANOMALY, "z80 port %04x write %02x", a, d);
+ a &= 0xc1;
+ switch (a)
+ {
+ case 0x01:
+ Pico.sms_io_ctl = d;
+ break;
+
+ case 0x40:
+ case 0x41:
+ if (PicoOpt & POPT_EN_PSG)
+ SN76496Write(d);
+ break;
+
+ case 0x80:
+ vdp_data_write(d);
+ break;
+
+ case 0x81:
+ vdp_ctl_write(d);
+ break;
+ }
+}
+
+static void write_bank(unsigned short a, unsigned char d)
+{
+ d &= 0x3f; // XXX
+ switch (a & 0x0f)
+ {
+ case 0x0c:
+ break;
+ case 0x0d:
+ if (d != 0)
+ elprintf(EL_STATUS|EL_ANOMALY, "bank0 changed to %d!", d);
+ break;
+ case 0x0e:
+ z80_map_set(z80_read_map, 0x4000, 0x7fff, Pico.rom + (d << 14), 0);
+#ifdef _USE_CZ80
+ Cz80_Set_Fetch(&CZ80, 0x4000, 0x7fff, (UINT32)Pico.rom + (d << 14));
+#endif
+ break;
+ case 0x0f:
+ z80_map_set(z80_read_map, 0x8000, 0xbfff, Pico.rom + (d << 14), 0);
+#ifdef _USE_CZ80
+ Cz80_Set_Fetch(&CZ80, 0x8000, 0xbfff, (UINT32)Pico.rom + (d << 14));
+#endif
+ break;
+ }