Coin lockout: Difference between revisions
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(Created page with "The coin lockout mechanism is a common cab device, which isn't specific to MVS cabs. * '''When powered''', it allows an inserted coin to hit the coin switch and go in the...") |
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They are software controlled by registers {{Reg|REG_RESETCL1}}, {{Reg|REG_RESETCL2}}, {{Reg|REG_SETCL1}}, and {{Reg|REG_SETCL2}}. | They are software controlled by registers {{Reg|REG_RESETCL1}}, {{Reg|REG_RESETCL2}}, {{Reg|REG_SETCL1}}, and {{Reg|REG_SETCL2}}. | ||
[[Category:Cartridge | [[Category:Cartridge systems]] | ||
Revision as of 01:37, 3 March 2016
The coin lockout mechanism is a common cab device, which isn't specific to MVS cabs.
- When powered, it allows an inserted coin to hit the coin switch and go in the coin box.
- When not powered, it defaults to a "safe" position which makes the coin take the return path.
This mechanism and the watchdog system were devised as failsafe measures to prevent users from losing an inserted coin when the cab isn't operating (properly).
Coin lockouts are typically hardwired to 12V only. It's the game PCB's job to power them by grounding their second terminal, then closing the circuit.
On MVS hardware, the coin lockout outputs are driven by NEO-F0 through an ULN2003 power transistor array, providing open-collector outputs.
They are software controlled by registers REG_RESETCL1, REG_RESETCL2, REG_SETCL1, and REG_SETCL2.