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6522via.cpp: Implement Shift Register Mode 0.

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This commit is contained in:
Nigel Barnes 2022-06-22 21:27:38 +01:00
parent 6d2442d824
commit 3fdef44afd
1 changed files with 5 additions and 5 deletions
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10
src/devices/machine/6522via.cpp
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@ -449,7 +449,7 @@ void via6522_device::shift_out()
}
else // Check for INT condition, eg the last and raising edge of the 15-0 falling/raising edges
{
if (!SO_T2_RATE(m_acr)) // The T2 continous shifter doesn't do interrupts (mode 4)
if (!SO_T2_RATE(m_acr)) // The T2 continuous shifter doesn't do interrupts (mode 4)
{
if (m_shift_counter == 0 && (SO_O2_CONTROL(m_acr) || SO_T2_CONTROL(m_acr)))
{
@ -470,7 +470,7 @@ void via6522_device::shift_in()
m_sr = (m_sr << 1) | (m_in_cb2 & 1);
LOGSHIFT("%02x\n", m_sr);
if (m_shift_counter == 0)
if (m_shift_counter == 0 && !SR_DISABLED(m_acr))
{
LOGINT("SHIFT in INT request ");
// set_int(INT_SR);// TODO: this interrupt is 1-2 clock cycles too early
@ -503,7 +503,7 @@ TIMER_CALLBACK_MEMBER(via6522_device::shift_tick)
shift_in();
}
// If in continous mode or the shifter is still shifting we re-arm the timer
// If in continuous mode or the shifter is still shifting we re-arm the timer
if (SO_T2_RATE(m_acr) || (m_shift_counter < 0x0f))
{
if (SI_O2_CONTROL(m_acr) || SO_O2_CONTROL(m_acr))
@ -1017,7 +1017,7 @@ void via6522_device::write(offs_t offset, u8 data)
if (SI_T2_CONTROL(m_acr)) LOGSHIFT("IN on T2");
if (SI_O2_CONTROL(m_acr)) LOGSHIFT("IN on O2");
if (SI_EXT_CONTROL(m_acr)) LOGSHIFT("IN on EXT");
if (SO_T2_RATE(m_acr)) LOGSHIFT("OUT on continous T2");
if (SO_T2_RATE(m_acr)) LOGSHIFT("OUT on continuous T2");
if (SO_T2_CONTROL(m_acr)) LOGSHIFT("OUT on T2");
if (SO_O2_CONTROL(m_acr)) LOGSHIFT("OUT on O2");
if (SO_EXT_CONTROL(m_acr)) LOGSHIFT("OUT on EXT");
@ -1187,7 +1187,7 @@ WRITE_LINE_MEMBER( via6522_device::write_cb1 )
LOGSHIFT("SHIFT OUT EXT/CB1 falling edge, %d\n", m_shift_counter);
shift_out();
}
else if (SI_EXT_CONTROL(m_acr))
else if (SI_EXT_CONTROL(m_acr) || SR_DISABLED(m_acr))
{
LOGSHIFT("SHIFT IN EXT/CB1 raising edge, %d\n", m_shift_counter);
shift_in();