[Aug/12/2001]

Parallel Turn
(c) Jaleco, 1984

Top PCB
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PCB No. PT-8418
CPU:  Z80A
SND:  AY-3-8010 x 2, Z80A
DIPS: 8 position x 2
RAM:  2114 x 2, MSM2128 x 1 (equivalent to 6116)

Other: Reset Switch near edge connector

       Custom JALECO chip (24 pin DIP) near RAM MSM2128, verified to be NOT 2128 ram.

       Pinouts are :
       Pin 1 hooked to pin 3 of ROM 7
       Pin 2 hooked to pin 4 of ROM 7
       Pin 3 hooked to pin 5 of ROM 7
       Pin 4 hooked to pin 6 of ROM 7
       Pin 5 hooked to pin 7 of ROM 7
       Pin 6 hooked to pin 8 of ROM 7
       Pin 7 hooked to pin 9 of ROM 7
       Pin 8 hooked to pin 10 of ROM 7
       Pin 9 hooked to pin 11 of ROM 7
       Pin 10 hooked to pin 12 of ROM 7
       Pin 11 hooked to pin 13 of ROM 7
       Pin 12 GND
       Pin 13 hooked to pin 13 of 2128 and pin 15 of ROM 7
       Pin 14 hooked to pin 14 of 2128 and pin 16 of ROM 7
       Pin 15 hooked to pin 17 of ROM 7
       Pin 16 hooked to pin 18 of ROM 7
       Pin 17 hooked to pin 19 of ROM 7
       Pin 18 NC
       Pin 19 NC
       Pin 20 hooked to pin 11 of 74LS32 at 4F
       Pin 21 hooked to pin 8 of 74LS32 at 4F
       Pin 22 hooked to pin 24 of ROM 7
       Pin 23 hooked to pin 25 of ROM 7
       Pin 24 +5

NOTE: The archive contains a different ROM7 that was in another archive. 
      (I merged all archives since they are identical other than ROM 7 in one archive named 7.BIN)
      Perhaps this is from a bootleg PCB with a workaround for the custom JALECO chip?


ROMS: All ROM labels say only "PROM" and a number.
      1, 2, 3 and 9 near Z80 at 5K, all 2732's
      4, 5, 6 & 7 near custom JALECO chip and Z80 at 3D, all 2764's
      prom_red.3p type TBP24S10 
      prom_grn.4p type N82S129
      prom_blu.4r type TBP24S10

 
LOWER PCB
---------

PCB:  PT-8419
XTAL: ? Stamped KSS5, connected to pins 8 & 13 of 74LS37 at 9P
      Also connected to 2 x 330 Ohm resistors which are in turn connected to pins 
      9 & 11 of 9P. Pins 9 & 11 of 9P are joined with a 101 ceramic capacitor.
      UPDATE! When I substitute various speed xtals, a 8.000MHz xtal allows the PCB to work fine. 

RAM:  AM93422DC x 2, MB7063 x 1, 2114 x 4

ROMS: All ROM labels say only "PROM" and a number.
      10, 14, 15 & 16 type 2764
      11, 12, 13 type 2732

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[08/02/99]

-----------------------
Parallel Turn by JALECO
-----------------------


Location   Device     File ID     Checksum
------------------------------------------
TB K8       2732       PROM1        30AD
TB K7       2732       PROM2        9122
TB K6       2732       PROM3        583E
TB D8       2764       PROM4        9B00
TB D7       2764       PROM5        7913
TB B8       2764       PROM6        A035
TB B7       2764       PROM7        FBA9
TB P5       2732       PROM9        9EC1
LB D16      2764       PROM10       6B59
LB E16      2732       PROM11       BAFA
LB F16      2732       PROM12       829A
LB J17      2732       PROM13       75B6
LB L17      2764       PROM14       B168
LB M17      2764       PROM15       CE3B
LB N17      2764       PROM16       5E8E


Note: TB - Top board      PT-8418
      LB - Lower board    PT-8419

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[Jan/29/2000]

Jaleco Ltd, 1984, "Parallel Turn"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Dumped ...

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