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author fulivi <fulivi@users.noreply.github.com>2015-08-08 17:48:17 +0200
committer fulivi <fulivi@users.noreply.github.com>2015-08-17 10:38:35 +0200
commita7abd5aaac35af248b46a6ceccef7b704dfba120 (patch)
treea5063bae72f1bd94414aef74e8f97ba0eb96a78d /src
parente3b06ea5f3c88641e1ece21b22e517c78b86f1ad (diff)
hp64k: first step of rs232 emulation
Diffstat (limited to 'src')
-rw-r--r--src/mess/drivers/hp64k.c141
1 files changed, 138 insertions, 3 deletions
diff --git a/src/mess/drivers/hp64k.c b/src/mess/drivers/hp64k.c
index 37ad5231b45..fc992e77600 100644
--- a/src/mess/drivers/hp64k.c
+++ b/src/mess/drivers/hp64k.c
@@ -158,6 +158,8 @@
#include "machine/74123.h"
#include "machine/rescap.h"
#include "sound/beep.h"
+#include "machine/clock.h"
+#include "machine/i8251.h"
#define BIT_MASK(n) (1U << (n))
@@ -165,6 +167,8 @@
#define BIT_CLR(w , n) ((w) &= ~BIT_MASK(n))
#define BIT_SET(w , n) ((w) |= BIT_MASK(n))
+#define BAUD_RATE_GEN_CLOCK 5068800
+
class hp64k_state : public driver_device
{
public:
@@ -212,9 +216,14 @@ public:
void hp64k_floppy_wpt_cb(floppy_image_device *floppy , int state);
DECLARE_READ16_MEMBER(hp64k_usart_r);
+ DECLARE_WRITE16_MEMBER(hp64k_usart_w);
+ DECLARE_WRITE_LINE_MEMBER(hp64k_rxrdy_w);
+ DECLARE_WRITE_LINE_MEMBER(hp64k_txrdy_w);
DECLARE_WRITE16_MEMBER(hp64k_beep_w);
TIMER_DEVICE_CALLBACK_MEMBER(hp64k_beeper_off);
+
+ DECLARE_WRITE_LINE_MEMBER(hp64k_baud_clk_w);
private:
required_device<hp_5061_3011_cpu_device> m_cpu;
required_device<i8275_device> m_crtc;
@@ -232,6 +241,9 @@ private:
required_ioport m_rs232_sw;
required_device<beep_device> m_beeper;
required_device<timer_device> m_beep_timer;
+ required_device<clock_device> m_baud_rate;
+ required_ioport m_s5_sw;
+ required_device<i8251_device> m_uart;
// Character generator
const UINT8 *m_chargen;
@@ -281,6 +293,11 @@ private:
floppy_state_t m_floppy_if_state;
floppy_image_device *m_current_floppy;
+
+ // RS232 I/F
+ bool m_16x_clk;
+ bool m_baud_clk;
+ UINT8 m_16x_div;
};
static ADDRESS_MAP_START(cpu_mem_map , AS_PROGRAM , 16 , hp64k_state)
@@ -300,6 +317,9 @@ static ADDRESS_MAP_START(cpu_io_map , AS_IO , 16 , hp64k_state)
// PA = 4, IC = [0..3]
// Floppy I/F
AM_RANGE(HP_MAKE_IOADDR(4 , 0) , HP_MAKE_IOADDR(4 , 3)) AM_READWRITE(hp64k_flp_r , hp64k_flp_w)
+ // PA = 5, IC = [0..3]
+ // Write to USART
+ AM_RANGE(HP_MAKE_IOADDR(5 , 0) , HP_MAKE_IOADDR(5 , 3)) AM_WRITE(hp64k_usart_w)
// PA = 6, IC = [0..3]
// Read from USART
AM_RANGE(HP_MAKE_IOADDR(6 , 0) , HP_MAKE_IOADDR(6 , 3)) AM_READ(hp64k_usart_r)
@@ -334,7 +354,10 @@ hp64k_state::hp64k_state(const machine_config &mconfig, device_type type, const
m_rear_panel_sw(*this , "rear_sw"),
m_rs232_sw(*this , "rs232_sw"),
m_beeper(*this , "beeper"),
- m_beep_timer(*this , "beep_timer")
+ m_beep_timer(*this , "beep_timer"),
+ m_baud_rate(*this , "baud_rate"),
+ m_s5_sw(*this , "s5_sw"),
+ m_uart(*this , "uart")
{
}
@@ -349,6 +372,26 @@ void hp64k_state::video_start()
m_chargen = memregion("chargen")->base();
}
+// Divisors of K1135 baud rate generator
+static unsigned baud_rate_divisors[] = {
+ 6336,
+ 4224,
+ 2880,
+ 2355,
+ 2112,
+ 1056,
+ 528,
+ 264,
+ 176,
+ 158,
+ 132,
+ 88,
+ 66,
+ 44,
+ 33,
+ 16
+};
+
void hp64k_state::machine_reset()
{
m_crtc_drq = false;
@@ -372,6 +415,8 @@ void hp64k_state::machine_reset()
m_floppy0_wpt = false;
m_floppy1_wpt = false;
m_beeper->set_state(0);
+ m_baud_rate->set_unscaled_clock(BAUD_RATE_GEN_CLOCK / baud_rate_divisors[ (m_s5_sw->read() >> 1) & 0xf ]);
+ m_16x_clk = (m_rs232_sw->read() & 0x02) != 0;
}
UINT8 hp64k_state::hp64k_crtc_filter(UINT8 data)
@@ -895,9 +940,54 @@ void hp64k_state::hp64k_floppy_wpt_cb(floppy_image_device *floppy , int state)
READ16_MEMBER(hp64k_state::hp64k_usart_r)
{
- // todo
+ UINT16 tmp;
+
+ if ((offset & 1) == 0) {
+ tmp = m_uart->status_r(space , 0);
+ } else {
+ tmp = m_uart->data_r(space , 0);
+ }
+
// bit 8 == bit 7 rear panel switches (modem/terminal) ???
- return m_rs232_sw->read() << 8;
+
+ tmp |= (m_rs232_sw->read() << 8);
+
+ if (BIT(m_rear_panel_sw->read() , 7)) {
+ BIT_SET(tmp , 8);
+ }
+
+ return tmp;
+}
+
+WRITE16_MEMBER(hp64k_state::hp64k_usart_w)
+{
+ if ((offset & 1) == 0) {
+ m_uart->control_w(space , 0 , (UINT8)(data & 0xff));
+ } else {
+ m_uart->data_w(space , 0 , (UINT8)(data & 0xff));
+ }
+}
+
+WRITE_LINE_MEMBER(hp64k_state::hp64k_rxrdy_w)
+{
+ if (state) {
+ BIT_SET(m_irl_pending , 6);
+ } else {
+ BIT_CLR(m_irl_pending , 6);
+ }
+
+ hp64k_update_irl();
+}
+
+WRITE_LINE_MEMBER(hp64k_state::hp64k_txrdy_w)
+{
+ if (state) {
+ BIT_SET(m_irl_pending , 5);
+ } else {
+ BIT_CLR(m_irl_pending , 5);
+ }
+
+ hp64k_update_irl();
}
WRITE16_MEMBER(hp64k_state::hp64k_beep_w)
@@ -914,6 +1004,19 @@ TIMER_DEVICE_CALLBACK_MEMBER(hp64k_state::hp64k_beeper_off)
m_beeper->set_state(0);
}
+WRITE_LINE_MEMBER(hp64k_state::hp64k_baud_clk_w)
+{
+ if (!m_16x_clk) {
+ if (state && !m_baud_clk) {
+ m_16x_div++;
+ }
+ m_baud_clk = !!state;
+ state = BIT(m_16x_div , 3);
+ }
+ m_uart->write_txc(state);
+ m_uart->write_rxc(state);
+}
+
static INPUT_PORTS_START(hp64k)
// Keyboard is arranged in a 8 x 16 matrix. Of the 128 possible positions, only 77 are used.
// For key arrangement on the matrix, see [1] pg 334
@@ -1129,6 +1232,30 @@ static INPUT_PORTS_START(hp64k)
PORT_DIPSETTING(0x00 , "1x")
PORT_DIPSETTING(0x02 , "16x")
+ PORT_START("s5_sw")
+ PORT_DIPNAME(0x01 , 0x00 , "Duplex")
+ PORT_DIPLOCATION("S5 IO:!1")
+ PORT_DIPSETTING(0x00 , "Half duplex")
+ PORT_DIPSETTING(0x01 , "Full duplex")
+ PORT_DIPNAME(0x1e , 0x00 , "Baud rate")
+ PORT_DIPLOCATION("S5 IO:!5,!4,!3,!2")
+ PORT_DIPSETTING(0x00 , "50")
+ PORT_DIPSETTING(0x02 , "75")
+ PORT_DIPSETTING(0x04 , "110")
+ PORT_DIPSETTING(0x06 , "134.5")
+ PORT_DIPSETTING(0x08 , "150")
+ PORT_DIPSETTING(0x0a , "300")
+ PORT_DIPSETTING(0x0c , "600")
+ PORT_DIPSETTING(0x0e , "1200")
+ PORT_DIPSETTING(0x10 , "1800")
+ PORT_DIPSETTING(0x12 , "2000")
+ PORT_DIPSETTING(0x14 , "2400")
+ PORT_DIPSETTING(0x16 , "3600")
+ PORT_DIPSETTING(0x18 , "4800")
+ PORT_DIPSETTING(0x1a , "7200")
+ PORT_DIPSETTING(0x1c , "9600")
+ PORT_DIPSETTING(0x1e , "19200")
+
INPUT_PORTS_END
static SLOT_INTERFACE_START(hp64k_floppies)
@@ -1191,6 +1318,14 @@ static MACHINE_CONFIG_START(hp64k , hp64k_state)
MCFG_SOUND_ROUTE(ALL_OUTPUTS , "mono" , 1.00)
MCFG_TIMER_DRIVER_ADD("beep_timer" , hp64k_state , hp64k_beeper_off);
+
+ MCFG_DEVICE_ADD("baud_rate" , CLOCK , 0)
+ MCFG_CLOCK_SIGNAL_HANDLER(WRITELINE(hp64k_state , hp64k_baud_clk_w));
+
+ MCFG_DEVICE_ADD("uart" , I8251 , 0)
+ MCFG_I8251_RXRDY_HANDLER(WRITELINE(hp64k_state , hp64k_rxrdy_w));
+ MCFG_I8251_TXRDY_HANDLER(WRITELINE(hp64k_state , hp64k_txrdy_w));
+
MACHINE_CONFIG_END
ROM_START(hp64k)