Lisa: Fixed polarity of COPS handshake signal, POST now passes. [R. Belmont]

Author: rbelmont

src/mess/machine/lisa.c

@@ -230,19 +230,9 @@ INLINE void set_VTIR(running_machine &machine, int value)
 
 
 /*
-    keyboard interface
+    keyboard interface (COPS simulation; our COPS CPU core is too broken and too esoteric to emulate this correctly, I tried)
 */
 
-
-
-
-
-
-
-
-
-
-
 INLINE void COPS_send_data_if_possible(running_machine &machine)
 {
 	lisa_state *state = machine.driver_data<lisa_state>();
@@ -251,7 +241,7 @@ INLINE void COPS_send_data_if_possible(running_machine &machine)
 
 	if ((! state->m_hold_COPS_data) && state->m_fifo_size && (! state->m_COPS_Ready))
 	{
-		logerror("Pushing one byte of data to VIA\n");
+//        printf("COPsim: sending %02x to VIA\n", state->m_fifo_data[state->m_fifo_head]);
 
 		via_0->write_porta(*space, 0, state->m_fifo_data[state->m_fifo_head]);	/* output data */
 		if (state->m_fifo_head == state->m_mouse_data_offset)
@@ -281,7 +271,7 @@ static void COPS_queue_data(running_machine &machine, const UINT8 *data, int len
 #endif
 
 	{
-		logerror("Adding %d bytes of data to FIFO\n", len);
+//		printf("Adding %d bytes of data to FIFO\n", len);
 
 		while (len--)
 		{
@@ -447,6 +437,8 @@ static TIMER_CALLBACK(read_COPS_command)
 	/* some pull-ups allow the COPS to read 1s when the VIA port is not set as output */
 	command = (state->m_COPS_command | (~ via_0->read(*space, VIA_DDRA))) & 0xff;
 
+//    printf("Dropping Ready, command = %02x\n", command);
+
 	if (command & 0x80)
 		return;	/* NOP */
 
@@ -690,7 +682,8 @@ static void init_COPS(running_machine &machine)
 static WRITE8_DEVICE_HANDLER(COPS_via_out_a)
 {
 	lisa_state *state = device->machine().driver_data<lisa_state>();
-	state->m_COPS_command = data;
+//    printf("VIA A = %02x\n", data);
+    state->m_COPS_command = data;
 }
 
 static WRITE8_DEVICE_HANDLER(COPS_via_out_ca2)
@@ -723,7 +716,7 @@ static READ8_DEVICE_HANDLER(COPS_via_in_b)
 	lisa_state *state = device->machine().driver_data<lisa_state>();
 	int val = 0;
 
-	if (! state->m_COPS_Ready)
+	if (state->m_COPS_Ready)
 		val |= 0x40;
 
 	if (state->m_FDIR)