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(MESS) ti99: Added a sanity check for disk format detection and a non-locking Alphalock

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This commit is contained in:
Michael Zapf 2015-03-17 21:09:39 +01:00
parent 490ed5ce9b
commit d498d5cedf
2 changed files with 11 additions and 2 deletions
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3
src/lib/formats/ti99_dsk.c
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@ -835,6 +835,9 @@ void ti99_sdf_format::determine_sizes(io_generic *io, int& cell_size, int& secto
have_vib = true;
}
// Do we have a broken VIB? The Pascal disks are known to have such incomplete VIBs
if (heads == 0 || sector_count == 0) have_vib = false;
// We're also checking the size of the image
int cell_size1 = 0;
int sector_count1 = 0;

10
src/mess/drivers/ti99_4x.c
View File

@ -351,6 +351,12 @@ static INPUT_PORTS_START(ti99_4a)
PORT_START("ALPHA") /* one more port for Alpha line */
PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Alpha Lock") PORT_CODE(KEYCODE_CAPSLOCK) PORT_TOGGLE
/* another version of Alpha Lock which is non-toggling; this is useful when we want to attach
a real TI keyboard for input. For home computers, the Alpha Lock / Shift Lock was a physically
locking key. */
PORT_START("ALPHA1")
PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Alpha Lock non-toggle") PORT_CODE(KEYCODE_RWIN)
INPUT_PORTS_END
@ -462,7 +468,7 @@ READ8_MEMBER( ti99_4x_state::read_by_9901 )
// the line enough to make the TMS9901 sense the low level.
// A reported, feasible fix was to cut the line and insert a diode
// below the Alphalock key.
if ((ioport("ALPHABUG")!=0) && (m_model!=MODEL_4)) answer |= ioport("ALPHA")->read();
if ((ioport("ALPHABUG")!=0) && (m_model!=MODEL_4)) answer |= (ioport("ALPHA")->read() | ioport("ALPHA1")->read());
}
else
{
@ -470,7 +476,7 @@ READ8_MEMBER( ti99_4x_state::read_by_9901 )
}
if (m_check_alphalock) // never true for TI-99/4
{
answer &= ~(ioport("ALPHA")->read());
answer &= ~(ioport("ALPHA")->read() | ioport("ALPHA1")->read());
}
answer = (answer << 3);
if (m_int1 == CLEAR_LINE) answer |= 0x02;