diff options
author | AJR <ajrhacker@users.noreply.github.com> | 2018-01-08 18:46:51 -0500 |
---|---|---|
committer | AJR <ajrhacker@users.noreply.github.com> | 2018-01-09 09:04:27 -0500 |
commit | 0d3d027e0b9da57932ba52a4a80dafa6a4ca97c0 (patch) | |
tree | e425db99c4f4057efcba6a3cc5867d0be9fbe940 | |
parent | c5ee1d8a45088a34853d9883bc0b54e66e2041ac (diff) |
altos2: Identify the 80/132 switch (nw)
-rw-r--r-- | src/mame/drivers/altos2.cpp | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/src/mame/drivers/altos2.cpp b/src/mame/drivers/altos2.cpp index 4535aa0cee6..a7d63bbcb0c 100644 --- a/src/mame/drivers/altos2.cpp +++ b/src/mame/drivers/altos2.cpp @@ -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 |