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author | 2017-12-08 23:47:23 +0100 | |
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committer | 2017-12-08 23:47:23 +0100 | |
commit | 2b4fe3cea0938d3de7f02e5c22c247e02eec06d6 (patch) | |
tree | ba1352310091f405669405deb4ce94f4fa35be30 | |
parent | 20959911dbc6ef972c167c6f7f4112fa4c0a7eb4 (diff) |
fidel6502: add note about eastbloc clone (nw)
-rw-r--r-- | src/mame/drivers/fidel6502.cpp | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/mame/drivers/fidel6502.cpp b/src/mame/drivers/fidel6502.cpp index 46c144b0db0..45d7e0a7f90 100644 --- a/src/mame/drivers/fidel6502.cpp +++ b/src/mame/drivers/fidel6502.cpp @@ -351,6 +351,27 @@ CPU D6 to W: (model 6092, tied to VCC otherwise) - D2-D6: VCC - D7: TSI BUSY +------------------ +One interesting clone of The Excellence is the Computerchess Playmate-2. It was +produced in 1989 by SPS(Bulgaria) and RRR(Riga Radio Factory). The chess program +ROM is identical to Excellence EP12. All internal circuitry is the same, the only +difference is the capacitor driving the 555 for IRQ is 10nf instead of 22nf. + +What makes it unique is the addition of a chess clock. + +connector pinout from main pcb: +1) 5V +2) GND +3) 74HC259.pin9 (Q4) = Row LED driving +4) 74HC259.pin10 (Q5) = Column LED driving +5) 74HC259.pin12 (Q7) = Bat. Low signal +6) 74HC42.pin4 (Q3) = Col-D/Row-4 -> 'White Move' if D-LED blinks + +The extra board has a 7474, a К1016ХЛ1 (RTC, or MCU clock driver), a 4-digit +VFD display, and some buttons for controlling the clock. IRQ frequency is doubled +presumedly for using the blinking led as seconds counter. It only tracks player time, +not of the opponent. And it obviously doesn't show chessmove coordinates either. + ****************************************************************************** |