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geneve: Fixed address decoding in IDE card for standard Geneve; changed default for RTC chip.

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This commit is contained in:
Michael Zapf 2021-03-03 19:43:42 +01:00
parent 9a25a60fe2
commit cf4c992b55
2 changed files with 16 additions and 2 deletions
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15
src/devices/bus/ti99/peb/tn_ide.cpp
View File

@ -178,7 +178,8 @@ nouspikel_ide_card_device::nouspikel_ide_card_device(const machine_config &mconf
m_ideint(false),
m_mode(MODE_OFF),
m_page(0),
m_rtctype(0)
m_rtctype(0),
m_genmod(false)
{
}
@ -474,6 +475,9 @@ void nouspikel_ide_card_device::decode(offs_t offset, bool& mmap, bool& sramsel,
{
bool inspace = false;
// In a normal Geneve, assume AME=1, AMD=0
if (!m_genmod) offset = ((offset & 0x07ffff) | 0x100000);
// A0=0
if (m_mode == MODE_TI) inspace = ((offset & 0x8000)==0);
else
@ -666,6 +670,7 @@ void nouspikel_ide_card_device::device_reset()
m_mode = ioport("MODE")->read();
m_srammap = (ioport("MAPMODE")->read()!=0);
m_rtctype = rtype[ioport("RTC")->read()];
m_genmod = (ioport("GENMOD")->read() != 0);
// The 65271 option does not support buffered SRAM; only the BQ4847
// can drive a buffered external RAM; the other two chips have internal SRAM
@ -689,12 +694,18 @@ INPUT_CHANGED_MEMBER( nouspikel_ide_card_device::mode_changed )
INPUT_PORTS_START( tn_ide )
PORT_START("RTC")
PORT_CONFNAME(0x03, 0, "RTC chip")
PORT_CONFNAME(0x03, 1, "RTC chip")
PORT_CONFSETTING(0, "RTC-65271")
PORT_CONFSETTING(1, "BQ4847 (ext SRAM)")
PORT_CONFSETTING(2, "BQ4842 (128K)")
PORT_CONFSETTING(3, "BQ4852 (512K)")
// When used in a normal Geneve, AME/AMD lines are set to (1,0)
PORT_START("GENMOD")
PORT_CONFNAME(0x01, 0, "Genmod decoding")
PORT_CONFSETTING(0, DEF_STR( Off ))
PORT_CONFSETTING(1, DEF_STR( On ))
// The switch should be open (1) on powerup for BQ clock chips
PORT_START("MAPMODE")
PORT_DIPNAME(0x1, 1, "Map at boot time") PORT_CHANGED_MEMBER(DEVICE_SELF, nouspikel_ide_card_device, mode_changed, 0)

3
src/devices/bus/ti99/peb/tn_ide.h
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@ -68,6 +68,9 @@ private:
// RTC type
int m_rtctype;
// Genmod decoding. If not used, the AME line is pulled up, and the AMD line is pulled down
bool m_genmod;
DECLARE_WRITE_LINE_MEMBER(clock_interrupt_callback);
DECLARE_WRITE_LINE_MEMBER(ide_interrupt_callback);
DECLARE_WRITE_LINE_MEMBER(resetdr_callback);