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ssystem3: update notes

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hap 2020-07-29 23:08:10 +02:00
parent 5f72e46f47
commit 5de0896497
1 changed files with 5 additions and 7 deletions
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12
src/mame/drivers/saitek_ssystem3.cpp
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@ -12,9 +12,7 @@ This is their 1st original product. MK II was licensed from Peter Jennings, and
MK I was, to put it bluntly, a bootleg. The chess engine is by Mike Johnson,
with support from David Levy.
Hardware notes:
Master Unit:
Hardware notes (Master Unit):
- Synertek 6502A @ 2MHz (4MHz XTAL)
- Synertek 6522 VIA
- 8KB ROM (2*Synertek 2332)
@ -54,8 +52,6 @@ TODO:
Should be doable to add, but 6522 device doesn't support live clock changes.
- LCD TC pin? connects to the display, source is a 50hz timer(from power supply),
probably to keep refreshing the LCD when inactive, there is no need to emulate it
- chess unit screen briefly shows glitches when the subcpu receives an NMI in the
middle of updating the LCD, BTANB?
- add chessboard screen to artwork
- dump/add printer unit
- dump/add ssystem3 1980 program revision, were the BTANB fixed?
@ -67,6 +63,8 @@ BTANB (ssystem3):
lessen the chance by adding a spring to the switch.
- Similar to the TIME switch bug, pressing 2 buttons simultaneously can cause it
to malfunction, eg. press A+CE or C+CE and an "8" appears in the display.
- chess unit screen briefly flickers at power-on and when the subcpu receives an
NMI in the middle of updating the LCD, it is mentioned in the manual
******************************************************************************/
@ -509,7 +507,8 @@ void ssystem3_state::ssystem3(machine_config &config)
m_pia->readpa_handler().set(FUNC(ssystem3_state::cu_pia_a_r));
m_pia->writepb_handler().set(FUNC(ssystem3_state::cu_pia_b_w));
m_pia->readpb_handler().set(FUNC(ssystem3_state::cu_pia_b_r));
m_pia->cb2_handler().set(m_pia, FUNC(pia6821_device::ca2_w));
m_pia->cb2_handler().set(m_pia, FUNC(pia6821_device::cb1_w));
m_pia->cb2_handler().append(m_pia, FUNC(pia6821_device::ca2_w));
NVRAM(config, "nvram", nvram_device::DEFAULT_ALL_0);
@ -527,7 +526,6 @@ void ssystem3_state::ssystem3(machine_config &config)
screen.set_visarea_full();
PWM_DISPLAY(config, m_display[1]).set_size(8, 48);
m_display[1]->set_refresh(attotime::from_hz(30));
m_display[1]->output_x().set(FUNC(ssystem3_state::lcd2_pwm_w));
m_display[0]->set_segmask(0xf, 0x7f); // 7segs are at expected positions