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Application of the set_address (AM_SETOFFSET) feature.

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This commit is contained in:
Michael Zapf 2013-09-21 22:37:56 +00:00
parent e93e197bb1
commit 9ed27202aa
1 changed files with 11 additions and 0 deletions
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11
src/emu/cpu/tms9900/tms9900.c
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@ -1382,6 +1382,14 @@ void tms99xx_device::acquire_instruction()
*/ */
void tms99xx_device::mem_read() void tms99xx_device::mem_read()
{ {
// The following line will be taken out of this method and
// be executed at an earlier microprogram clock tick
// After set_address, any device attached to the address bus may pull down
// READY in order to put the CPU into wait state before the read_word
// operation will be performed
// set_address and read_word should pass the same address as argument
m_prgspace->set_address(m_address & m_prgaddr_mask & 0xfffe);
m_current_value = m_prgspace->read_word(m_address & m_prgaddr_mask & 0xfffe); m_current_value = m_prgspace->read_word(m_address & m_prgaddr_mask & 0xfffe);
pulse_clock(2); pulse_clock(2);
m_check_ready = true; m_check_ready = true;
@ -1390,6 +1398,9 @@ void tms99xx_device::mem_read()
void tms99xx_device::mem_write() void tms99xx_device::mem_write()
{ {
// see mem_read
m_prgspace->set_address(m_address & m_prgaddr_mask & 0xfffe);
m_prgspace->write_word(m_address & m_prgaddr_mask & 0xfffe, m_current_value); m_prgspace->write_word(m_address & m_prgaddr_mask & 0xfffe, m_current_value);
pulse_clock(2); pulse_clock(2);
m_check_ready = true; m_check_ready = true;