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lola8a: fixed video output, added inverted video mode

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This commit is contained in:
Miodrag Milanovic 2024-01-27 17:24:03 +01:00
parent 8c5a97b944
commit 34c7771586
1 changed files with 20 additions and 15 deletions
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35
src/mame/sfrj/lola8a.cpp
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@ -18,8 +18,11 @@ BASIC commands : (must be in UPPERcase)
SPC OFF TAB THEN TO STEP AND OR XOR NOT ABS LEN SQR INT ASC CHR VAL STR MID
ARG CALL RND LEFT RIGHT DOT SGN SIN FREE PI FN TAN COS POP PEEK INP LN EXP ATN
COLOUR x (x = 0 to 3) there's no known colour ram, unable to determine
how colours can be displayed. Therefore we only show black and white.
Image display is mono, COLOUR x (x = 0 to 3) command switch drawing in mode
0 - nothing
1 - set 1 on drawn pixel
2 - set 0 on drawn pixel
3 - xor drawn pixel with current value
Unknown how to produce sound - there's no commands.
@ -34,16 +37,15 @@ MON: (Guesswork by trying things)
- K : single-step? (address set by G) (K 99 : single-step at 99)
Control Keys
- A : display gets a little corrupted
- A : adds additional line for each char (making image higher)
- G : back to normal
- C : break? (only does a newline)
- L : clear screen
- M : same as pressing Enter
- Y : invert screen
TO DO
- How to use the sound?
- Does it have colour?
- What is Ctrl-A for?
- Need software
- Need manuals & schematics
@ -234,21 +236,24 @@ MC6845_UPDATE_ROW( lola8a_state::crtc_update_row )
{
rgb_t const *const palette = m_palette->palette()->entry_list_raw();
u32 *p = &bitmap.pix(y);
u8 inv = BIT(ma,13) ? 0xff : 0x00;
ma &= 0x7ff;
for (u8 x = 0; x < x_count; x++)
{
u16 mem = (x+ma)*8 + ra;
u8 gfx = m_p_videoram[mem] ^ ((cursor_x == x) ? 0xff : 0);
u8 gfx = m_p_videoram[mem] ^ ((cursor_x == x) ? 0xff : 0) ^ inv;
if (ra == 8) // empty line when Ctrl-A is used
gfx = inv;
*p++ = palette[BIT(gfx, 7) ? 7 : 0];
*p++ = palette[BIT(gfx, 6) ? 7 : 0];
*p++ = palette[BIT(gfx, 5) ? 7 : 0];
*p++ = palette[BIT(gfx, 4) ? 7 : 0];
*p++ = palette[BIT(gfx, 3) ? 7 : 0];
*p++ = palette[BIT(gfx, 2) ? 7 : 0];
*p++ = palette[BIT(gfx, 1) ? 7 : 0];
*p++ = palette[BIT(gfx, 0) ? 7 : 0];
*p++ = palette[BIT(gfx, 7)];
*p++ = palette[BIT(gfx, 6)];
*p++ = palette[BIT(gfx, 5)];
*p++ = palette[BIT(gfx, 4)];
*p++ = palette[BIT(gfx, 3)];
*p++ = palette[BIT(gfx, 2)];
*p++ = palette[BIT(gfx, 1)];
*p++ = palette[BIT(gfx, 0)];
}
}
@ -341,7 +346,7 @@ void lola8a_state::lola8a(machine_config &config)
crtc.set_update_row_callback(FUNC(lola8a_state::crtc_update_row));
crtc.out_vsync_callback().set(FUNC(lola8a_state::crtc_vsync));
PALETTE(config, m_palette, palette_device::BRG_3BIT);
PALETTE(config, m_palette, palette_device::MONOCHROME);
/* Cassette */
CASSETTE(config, m_cass);