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photon2.cpp documentation update based on schematics research [Mick]

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MetalliC 2016-09-09 15:13:02 +03:00
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src/mame/drivers/photon2.cpp
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// license:BSD-3-Clause
// copyright-holders:Mariusz Wojcieszek
/*
Photon IK2 system
Photon IK-3 system
Driver by Mariusz Wojcieszek
Russian arcade system based on ZX Spectrum home computer.
Russian arcade system based on ZX Spectrum home computer clone "Leningrad-1". Changes are:
- ROM bank switching added
- original IO addressing replaced by:
A7 A0
0 0 ROM bank switch
0 1 i8255
1 0 standard ZX FEh port (beeper, border color)
1 1 nothing
- added i8255, uses A5 and A6 to select ports, usage are:
PortA - joystick
PortB - joystick (unused)
PortC - bit 0 - Coin in, 1-3 - Time per Coin switches, 4 - block Coin in (out), 5 - NMI (out)
Each coin buys you 1-6 minutes of game time.
*/