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decwritr.c: update the la120 driver documentation a bit, fixed memory mirror related issue [Lord Nightmare]
decwritr.c: documented the Caps Lock key being a physical toggle [NeXT]
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Lord-Nightmare
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@ -8,6 +8,8 @@
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**************************************************************************/
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// tech manual: http://manx.classiccmp.org/mirror/vt100.net/docs/la120-tm/la120tm1.pdf
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#include "emu.h"
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#include "render.h"
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#include "cpu/i8085/i8085.h"
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@ -120,6 +122,18 @@ WRITE8_MEMBER( decwriter_state::la120_LED_w )
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(m_led_array&0x1)?"PAPER OUT":"---------" );
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}
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/* todo: er1400 device */
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/* control lines:
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3 2 1
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0 0 0 Standby
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0 0 1 Read
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0 1 0 Erase
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0 1 1 Write
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1 0 0 <unused>
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1 0 1 Shift data out
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1 1 0 Accept address
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1 1 1 Accept data
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*/
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READ8_MEMBER( decwriter_state::la120_NVR_r )
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{
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return 0xFF;
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@ -128,22 +142,65 @@ READ8_MEMBER( decwriter_state::la120_NVR_r )
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WRITE8_MEMBER( decwriter_state::la120_NVR_w )
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{
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}
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/* todo: fully reverse engineer DC305 ASIC */
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/* read registers: all 4 registers read the same set of 8 bits, but what register is being read may be selectable by writing
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Tech manual implies this register is an 8-bit position counter of where the carriage head currently is located.
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0 = 1 = 2 = 3
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data bits:
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76543210
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|||||||\- ?
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||||||\-- ?
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|||||\--- ?
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||||\---- ?
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|||\----- ?
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||\------ ?
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|\------- ?
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\-------- ?
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*/
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READ8_MEMBER( decwriter_state::la120_DC305_r )
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{
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return 0xFF;
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UINT8 data = 0x00;
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logerror("DC305 Read from offset %01x, returning %02X\n", offset, data);
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return data;
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}
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/* write registers:
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0 = ? (a bunch of data written here on start, likely motor control and setup bits)
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1 = ? (one byte written here, possibly voltage control, 0x00 or could be dot fifo write?)
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2 = ?
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3 = ?
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there are at least two bits in here to enable the 2.5ms tick interrupt(rst3) and the dot interrupt/linefeed(rtc expired) interrupt(rst5)
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the dot fifo is 4 bytes long, dot int fires when it is empty
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at least 3 bits control the speaker/buzzer which can be on or off, at least two volume levels, and at least two frequencies, 400hz or 2400hz
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two quadrature lines from the head servomotor connect here to allow the dc305 to determine motor position; one pulses when the motor turns clockwise and one when it turns counterclockwise. the head stop is found when the pulses stop, which firmware uses to find the zero position.
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*/
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WRITE8_MEMBER( decwriter_state::la120_DC305_w )
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{
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logerror("DC305 Write of %02X to offset %01X\n", data, offset);
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}
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/*
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* 8080 address map (x = ignored; * = selects address within this range)
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a15 a14 a13 a12 a11 a10 a9 a8 a7 a6 a5 a4 a3 a2 a1 a0
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0 0 0 0 * * * * * * * * * * * * R ROMS0 (e6 first half OR e6,e8)
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0 0 0 1 * * * * * * * * * * * * R ROMS1 (e6 second half OR e12,e17)
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0 0 1 0 0 * * * * * * * * * * * R ROMS2 (e4)
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0 0 1 0 1 * * * * * * * * * * * R ROMS2 (open bus)
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0 0 1 1 x x x x x x x * * * * * RW KBD(R)/LED(W)
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0 1 0 0 x x * * * * * * * * * * RW RAM0 (e7,e13)
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0 1 0 1 x x * * * * * * * * * * RW RAM1 (e9,e18)
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0 1 1 0 x * * * x x x x x x x * RW NVM (ER1400,e39)
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0 1 1 1 x x x x x x x x x x * * RW PTR (DC305 ASIC,e25)
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1 * * * * * * * * * * * * * * * Expansion space (open bus)
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*/
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static ADDRESS_MAP_START(la120_mem, AS_PROGRAM, 8, decwriter_state)
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ADDRESS_MAP_UNMAP_HIGH
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AM_RANGE( 0x0000, 0x2fff ) AM_ROM
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AM_RANGE( 0x3000, 0x3fff ) AM_READWRITE(la120_KBD_r, la120_LED_w) // keyboard read, write to status and 7seg LEDS
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AM_RANGE( 0x0000, 0x27ff ) AM_ROM
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AM_RANGE( 0x3000, 0x301f ) AM_READWRITE(la120_KBD_r, la120_LED_w) AM_MIRROR(0xFE0) // keyboard read, write to status and 7seg LEDS
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AM_RANGE( 0x4000, 0x43ff ) AM_MIRROR(0x0c00) AM_RAM // 1k 'low ram'
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AM_RANGE( 0x5000, 0x53ff ) AM_MIRROR(0x0c00) AM_RAM // 1k 'high ram'
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AM_RANGE( 0x6000, 0x6fff ) AM_MIRROR(0x08fe) AM_READWRITE(la120_NVR_r, la120_NVR_w) // ER1400 EAROM
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AM_RANGE( 0x7000, 0x7003 ) AM_MIRROR(0x0ffc) AM_READWRITE(la120_DC305_r, la120_DC305_w) // DC305 printer controller ASIC stuff; since this can generate interrupts this needs to be split to its own device.
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AM_RANGE( 0x6000, 0x67ff ) /*AM_MIRROR(0x08fe)*/AM_MIRROR(0x800) AM_READWRITE(la120_NVR_r, la120_NVR_w) // ER1400 EAROM; a10,9,8 are c3,2,1, a0 is clk, data i/o on d7, d0 always reads as 0 (there may have once been a second er1400 with data i/o on d0, sharing same address controls as the d7 one, not populated on shipping boards), d1-d6 read open bus
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AM_RANGE( 0x7000, 0x7003 ) AM_MIRROR(0x0ffc) AM_READWRITE(la120_DC305_r, la120_DC305_w) // DC305 printer controller ASIC stuff; since this can generate interrupts (dot interrupt, lf interrupt, 2.5ms interrupt) this needs to be split to its own device.
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// 8000-ffff is reserved for expansion (i.e. unused, open bus)
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ADDRESS_MAP_END
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@ -160,7 +217,7 @@ static ADDRESS_MAP_START(la120_io, AS_IO, 8, decwriter_state)
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ADDRESS_MAP_UNMAP_HIGH
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AM_RANGE(0x00, 0x00) AM_MIRROR(0x7C) AM_DEVREADWRITE("i8251", i8251_device, data_r, data_w) // 8251 Data
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AM_RANGE(0x01, 0x01) AM_MIRROR(0x7C) AM_DEVREADWRITE("i8251", i8251_device, status_r, control_w) // 8251 Status/Control
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//AM_RANGE(0x02, 0x02) AM_MIRROR(0x7D) // other io ports
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//AM_RANGE(0x02, 0x02) AM_MIRROR(0x7D) // other io ports, serial loopback etc, see table 4-9 in TM
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// 0x80-0xff are reserved for expansion (i.e. unused, open bus)
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ADDRESS_MAP_GLOBAL_MASK(0xff)
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ADDRESS_MAP_END
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@ -206,7 +263,7 @@ static INPUT_PORTS_START( la120 )
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PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("[ {") PORT_CODE(KEYCODE_OPENBRACE) PORT_CHAR('[') PORT_CHAR('{')
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PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("- _") PORT_CODE(KEYCODE_MINUS) PORT_CHAR('-') PORT_CHAR('_')
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PORT_BIT(0x60, IP_ACTIVE_HIGH, IPT_UNUSED)
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PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_TOGGLE PORT_NAME("Caps lock") PORT_CODE(KEYCODE_CAPSLOCK) // TODO: does the physical switch toggle?
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PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_TOGGLE PORT_NAME("Caps lock") PORT_CODE(KEYCODE_CAPSLOCK) // This key has a physical toggle
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PORT_START("COL5")
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PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Num 0") PORT_CODE(KEYCODE_0_PAD)
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PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("/ ?") PORT_CODE(KEYCODE_SLASH) PORT_CHAR('/') PORT_CHAR('?')
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