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vt52: Misc. notes and things (nw)

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This commit is contained in:
AJR 2019-12-24 11:28:23 -05:00
parent e7730aca67
commit 6f97b7535e
3 changed files with 8 additions and 6 deletions
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2
src/devices/cpu/vt50/vt50.cpp
View File

@ -556,7 +556,7 @@ void vt5x_cpu_device::execute_th(u8 inst)
void vt52_cpu_device::execute_th(u8 inst)
{
// not actually synchronized to TH
// not actually synchronized to TH (but may be gated externally with EN CYCLE)
if ((inst & 0362) == 0162)
m_graphic_callback(m_ram_do);

2
src/devices/cpu/vt50/vt50dasm.cpp
View File

@ -42,7 +42,7 @@ const char *const vt50_disassembler::s_opcodes_g[8] = {
};
const char *const vt52_disassembler::s_opcodes_g[8] = {
"M2A", "A2M", "M2U", "B2M", "M2X", "U2M", "M2B", "GRAPHIC"
"M2A", "A2M", "M2U", "B2M", "M2X", "U2M", "M2B", "GRPH"
};
const char *const vt5x_disassembler::s_jumps_h[2][8] = {

10
src/mame/drivers/vt52.cpp
View File

@ -116,10 +116,12 @@ void vt52_state::vert_count_w(u8 data)
m_uart->write_tcp(clk);
}
else
{
m_uart->write_rcp((~(baud | data) & 0x0e) == 0);
m_uart->write_tcp((~(baud | data) & 0x71) == 0);
}
}
if ((baud & 0x0380) == 0x0380)
else if ((baud & 0x0380) == 0x0380)
m_uart->write_tcp((~(baud | data) & 0x71) == 0);
}
@ -325,7 +327,7 @@ void vt52_state::vt52(machine_config &mconfig)
screen.set_screen_update(FUNC(vt52_state::screen_update));
SPEAKER(mconfig, "mono").front_center();
SPEAKER_SOUND(mconfig, "bell").add_route(ALL_OUTPUTS, "mono", 1.0);
SPEAKER_SOUND(mconfig, "bell").add_route(ALL_OUTPUTS, "mono", 1.0); // FIXME: uses a flyback diode circuit
}
ROM_START(vt52)
@ -339,4 +341,4 @@ ROM_START(vt52)
ROM_LOAD("23-002b4.e1", 0x000, 0x400, CRC(b486500c) SHA1(029f07424d6c23ee083db42d9f9c252ac728ccd0))
ROM_END
COMP(1975, vt52, 0, 0, vt52, vt52, vt52_state, empty_init, "Digital Equipment Corporation", "VT52 Video Display Terminal", MACHINE_NOT_WORKING)
COMP(1975, vt52, 0, 0, vt52, vt52, vt52_state, empty_init, "Digital Equipment Corporation", "VT52 Video Display Terminal", MACHINE_NOT_WORKING | MACHINE_IMPERFECT_SOUND)