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(nw) d6800 : added missing RST key; fixed instructions; marked working once again.

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This commit is contained in:
Robbbert 2019-02-01 20:09:48 +11:00
parent ba8d7b1c8f
commit 0059fe6493
1 changed files with 27 additions and 14 deletions
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41
src/mame/drivers/d6800.cpp
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@ -16,10 +16,16 @@
The cassette has no checksum, header or blocks. It is simply a stream
of pulses. The successful loading of a tape is therefore a matter of luck.
To modify memory, press RST, then enter the 4-digit address (nothing happens
until the 4th digit is pressed), then press FN, then 0, then the 2 digit data.
It will enter the data (you won't see anything), then the address will increment.
Enter the data for this new address. If you want to skip this address, press FN.
When you're done, press RST. NOTE!!! Do NOT change any of these addresses:
0000,0001,0006-007F, or the system may crash. It's recommended to start all
your programs at 0200.
Function keys:
FN 0 - Modify memory - firstly enter a 4-digit address, then 2-digit data
the address will increment by itself, enter the next byte.
FN by itself will step to the next address.
FN 0 - Modify memory - see above paragraph.
FN 1 - Tape load. You must have entered the start address at 0002, and
the end address+1 at 0004 (big-endian).
@ -27,19 +33,14 @@
FN 2 - Tape save. You must have entered the start address at 0002, and
the end address+1 at 0004 (big-endian).
FN 3 - Run. You must have entered the 4-digit go address first.
FN 3 - Run. To use, press RST, then enter the 4-digit start address
(nothing happens until the 4th digit is pressed), then FN, then 3.
All CHIP-8 programs load at 0x200 (max size 4k), and exec address
All CHIP-8 programs load at 0200 (max size 4k), and exec address
is C000.
Information and programs can be found at http://chip8.com/?page=78
2019-01-29: Noticed that when you try to enter the 4-digit address, it
runs into the weeds when the 2nd digit is pressed. Unable to locate a
version where it ever worked, even though the above text insinuates that
it once did. Marked as MNW until the problem can be resolved. The rest of
the machine appears to work fine. (Robbbert)
**********************************************************************************/
@ -80,6 +81,8 @@ public:
void d6800(machine_config &config);
DECLARE_INPUT_CHANGED_MEMBER(reset_button);
private:
DECLARE_READ8_MEMBER( d6800_cassette_r );
DECLARE_WRITE8_MEMBER( d6800_cassette_w );
@ -190,13 +193,23 @@ static INPUT_PORTS_START( d6800 )
PORT_START("SHIFT")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("FN") PORT_CODE(KEYCODE_LSHIFT)
PORT_START("RESET")
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("RST") PORT_CODE(KEYCODE_LALT) PORT_CHANGED_MEMBER(DEVICE_SELF, d6800_state, reset_button, nullptr)
PORT_START("VS")
/* vblank */
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_CUSTOM) PORT_VBLANK("screen")
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_CUSTOM) PORT_VBLANK("screen")
INPUT_PORTS_END
/* Video */
INPUT_CHANGED_MEMBER(d6800_state::reset_button)
{
// RESET button wired to POR on the mc6875, which activates the Reset output pin which in turn connects to the CPU's Reset pin.
if (newval)
m_pia->reset();
m_maincpu->set_input_line(INPUT_LINE_RESET, newval ? ASSERT_LINE : CLEAR_LINE);
}
/* Video */
uint32_t d6800_state::screen_update_d6800(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
uint8_t x,y,gfx=0;
@ -446,4 +459,4 @@ ROM_START( d6800 )
ROM_END
// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
COMP( 1979, d6800, 0, 0, d6800, d6800, d6800_state, empty_init, "Michael Bauer", "Dream 6800", MACHINE_NOT_WORKING )
COMP( 1979, d6800, 0, 0, d6800, d6800, d6800_state, empty_init, "Michael Bauer", "Dream 6800", 0 )