[MAME]

Wall Crash by Midcoin (c) 1984



     DIPSW-8     AY-3-8912                               DIPSW-4
                                                         DIPSW-4

						74s288


                                               WAC1   WAC2   WAC3
                                               (2532) (2532) (2532)
12.288MHz

   +------------+        2114  2114  2114  2114
   + EPOXY WITH +                                +-------+
   + LS08       +      WAC05  WAC1/52   EMPTY    + SMALL +
   +LS240, LS245+      (2764) (2764)    SOCKET   + EPOXY +
   + Z80        +                                +-------+
   +------------+

The bigger Epoxy brick contains three standard 74LSxxx chips and is used as
DATA lines decoder for all READS from addresses in range: 0..0x7fff.
The pinout (of the whole brick) is 1:1 Z80 and it can be replaced with
a plain Z80, given that decoded ROMS are put in place of WAC05 and WAC1/52.

The smaller Epoxy contains:
 5 chips (names sanded off...): 20 pins, 8 pins, 14 pins, 16 pins, 16 pins,
 1 resistor: 120 Ohm
 1 probably resistor: measured: 1000 Ohm
 1 diode: standard 1N4148 (info from HIGHWAYMAN)
 4 capacitors: 3 same: blue ones probably 10n , 1 smaller 1.3n (measured by HIGHWAYMAN)
It's mapped as ROM at 0x6000-0x7fff but is NOT accessed by the CPU.
It's also not needed for emulation.


Thanks to ... for providing info on how to get to these epoxies
(heat gun) and for info (very close one) on decoding.

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[Jul/20/2005]

Wall Crash (set 1)  
Midcoin? 1984  
  
Revision: cti/8304  

CPU:
2x big epoxy blocks
1x AY-3-8912 (sound)
1x oscillator 12.000 MHz  

ROMs:
3x TMS2532 (1,2,3)
2x TMS2764 (05,1-52)
1x PROM TBP18S030N  

Dumped 20/07/2005 

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