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z8: Add interface notes

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This commit is contained in:
AJR 2020-08-23 13:04:38 -04:00
parent 501157fbed
commit b8dcd0fd21
1 changed files with 9 additions and 0 deletions
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9
src/devices/cpu/z8/z8.cpp
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@ -15,6 +15,11 @@
- internal diagnostic ROM in data space (requires high voltage reset)
- what really happens when register pairs are unaligned?
Note that A8–A15 outputs are not enabled on Port 0 upon reset, except
on some later ROMless versions such as Z8691. This may redirect
external memory accesses, including program fetches, to FFxx until
P01M is written to. Z8681 is particularly affected by this.
*/
#include "emu.h"
@ -1538,6 +1543,7 @@ void z8_device::execute_set_input(int inputnum, int state)
{
switch ( inputnum )
{
// IRQ0 input is P32 (also DAV0/RDY0 handshake, not emulated)
case INPUT_LINE_IRQ0:
if (state != CLEAR_LINE && m_irq_line[0] == CLEAR_LINE)
request_interrupt(0);
@ -1550,6 +1556,7 @@ void z8_device::execute_set_input(int inputnum, int state)
break;
// IRQ1 input is P33
case INPUT_LINE_IRQ1:
if (state != CLEAR_LINE && m_irq_line[1] == CLEAR_LINE)
request_interrupt(1);
@ -1562,6 +1569,7 @@ void z8_device::execute_set_input(int inputnum, int state)
break;
// IRQ2 input is P31 (also TIN and DAV2/RDY2 handshake, latter not emulated)
case INPUT_LINE_IRQ2:
if (state != CLEAR_LINE && m_irq_line[2] == CLEAR_LINE)
request_interrupt(2);
@ -1582,6 +1590,7 @@ void z8_device::execute_set_input(int inputnum, int state)
break;
// IRQ3 input is P30 (also serial DI)
case INPUT_LINE_IRQ3:
if (state != CLEAR_LINE && m_irq_line[3] == CLEAR_LINE && (m_p3m & Z8_P3M_P3_SERIAL) == 0)
request_interrupt(3);