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altos2: Identify the 80/132 switch (nw)

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This commit is contained in:
AJR 2018-01-08 18:46:51 -05:00
parent c5ee1d8a45
commit 0d3d027e0b
1 changed files with 12 additions and 2 deletions
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14
src/mame/drivers/altos2.cpp
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@ -1,5 +1,5 @@
// license:BSD-3-Clause
// copyright-holders:
// copyright-holders:AJR
/***********************************************************************************************************************************
2017-11-03 Skeleton
@ -10,7 +10,7 @@ Chips: Z80A, 2x Z80DART, Z80CTC, X2210D, 2x CRT9006, CRT9007, CRT9021A, 8x 6116
Other: Beeper. Crystals: 4.9152, 8.000, 40.000
Keyboard: P8035L CPU, undumped 2716 labelled "358_2758"
Keyboard: P8035L CPU, undumped 2716 labelled "358_2758", XTAL marked "4608-300-107 KSS4C"
************************************************************************************************************************************/
@ -36,6 +36,8 @@ public:
, m_p_videoram(*this, "videoram")
{ }
DECLARE_WRITE8_MEMBER(video_mode_w);
u32 screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
private:
@ -53,6 +55,13 @@ void altos2_state::machine_reset()
m_novram->recall(CLEAR_LINE);
}
WRITE8_MEMBER(altos2_state::video_mode_w)
{
// D5 = 1 for 132-column mode (6-pixel char width)
// D5 = 0 for 80-column mode (10-pixel char width)
logerror("Writing %02X to mode register at %s\n", data, machine().describe_context());
}
u32 altos2_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
return 0;
@ -69,6 +78,7 @@ static ADDRESS_MAP_START( io_map, AS_IO, 8, altos2_state)
AM_RANGE(0x00, 0x03) AM_DEVREADWRITE("dart1", z80dart_device, ba_cd_r, ba_cd_w)
AM_RANGE(0x04, 0x07) AM_DEVREADWRITE("dart2", z80dart_device, ba_cd_r, ba_cd_w)
AM_RANGE(0x08, 0x0b) AM_DEVREADWRITE("ctc", z80ctc_device, read, write)
AM_RANGE(0x0c, 0x0c) AM_WRITE(video_mode_w)
AM_RANGE(0x40, 0x7f) AM_DEVREADWRITE("novram", x2210_device, read, write)
//AM_RANGE(0x80, 0xff) AM_DEVREADWRITE_MOD("vpac", crt9007_device, read, write, rshift<1>)
ADDRESS_MAP_END