diff --git a/src/mame/drivers/systel1.cpp b/src/mame/drivers/systel1.cpp
index c816079c138..39c47ab85f8 100644
--- a/src/mame/drivers/systel1.cpp
+++ b/src/mame/drivers/systel1.cpp
@@ -187,12 +187,12 @@ static void systel1_floppies(device_slot_interface &device)
 }
 
 static DEVICE_INPUT_DEFAULTS_START(keyboard)
-	DEVICE_INPUT_DEFAULTS("RS232_TXBAUD", 0xff, RS232_BAUD_9600)
+	DEVICE_INPUT_DEFAULTS("RS232_TXBAUD", 0xff, RS232_BAUD_1200)
 DEVICE_INPUT_DEFAULTS_END
 
 void systel1_state::systel1(machine_config &config)
 {
-	Z80(config, m_maincpu, 2_MHz_XTAL); // Z8400A; clock not verified
+	Z80(config, m_maincpu, 10.8864_MHz_XTAL / 4); // Z8400A; clock verified
 	m_maincpu->set_addrmap(AS_PROGRAM, &systel1_state::mem_map);
 	m_maincpu->set_addrmap(AS_OPCODES, &systel1_state::m1_map);
 	m_maincpu->set_addrmap(AS_IO, &systel1_state::io_map);
@@ -200,7 +200,7 @@ void systel1_state::systel1(machine_config &config)
 	input_merger_device &mainint(INPUT_MERGER_ANY_HIGH(config, "mainint"));
 	mainint.output_handler().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
 
-	I8257(config, m_dmac, 2_MHz_XTAL); // P8257-5
+	I8257(config, m_dmac, 10.8864_MHz_XTAL / 4); // P8257-5
 	m_dmac->out_hrq_cb().set(FUNC(systel1_state::hrq_w));
 	m_dmac->in_memr_cb().set(FUNC(systel1_state::memory_r));
 	m_dmac->out_memw_cb().set(FUNC(systel1_state::memory_w));
@@ -208,12 +208,12 @@ void systel1_state::systel1(machine_config &config)
 	m_dmac->out_iow_cb<1>().set(m_fdc, FUNC(fd1797_device::data_w));
 	m_dmac->out_iow_cb<2>().set("crtc", FUNC(i8276_device::dack_w));
 
-	i8251_device &usart(I8251(config, "usart", 2_MHz_XTAL)); // AMD P8251A
+	i8251_device &usart(I8251(config, "usart", 10.8864_MHz_XTAL / 4)); // AMD P8251A
 	usart.rxrdy_handler().set("mainint", FUNC(input_merger_device::in_w<0>));
 	usart.rts_handler().set(FUNC(systel1_state::rts_w));
 	usart.dtr_handler().set(FUNC(systel1_state::dtr_w));
 
-	clock_device &baudclock(CLOCK(config, "baudclock", 2_MHz_XTAL / 13)); // rate not verified, but also probably fixed
+	clock_device &baudclock(CLOCK(config, "baudclock", 2_MHz_XTAL / 104)); // 19.23 kHz verified; rate probably fixed
 	baudclock.signal_handler().set("usart", FUNC(i8251_device::write_rxc));
 	baudclock.signal_handler().append("usart", FUNC(i8251_device::write_txc));