[Jun/05/99]

IQ Block
IGS 1993

PCB 0036-5
                              SW1     SW2

  12MHz         W2466             8255

          IGS002   U24.5
                   U25.4   AMT001  6116-45
                                   6116-45
  Z80              U26.3
                   U27.2
  U7.V5            U28.1
  U8.6
  W2466
                              UMC UM3567

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[MAME]

IQ Block (alt hardware)
IGS, 1996

PCB Layout
----------

IGS PCB N0- 0131-4
|---------------------------------------|
|uPD1242H     VOL    U3567   3.579545MHz|
|                               AR17961 |
|   HD64180RP8                          |
|  16MHz                         BATTERY|
|                                       |
|                         SPEECH.U17    |
|                                       |
|J                        6264          |
|A                                      |
|M      8255              V.U18         |
|M                                      |
|A                                      |
|                                       |
|                                       |
|                      |-------|        |
|                      |       |        |
|       CG.U7          |IGS017 |        |
|                      |       |        |
|       TEXT.U8        |-------|   PAL  |
|            22MHz               61256  |
|                   DSW1  DSW2  DSW3    |
|---------------------------------------|
Notes:
      HD64180RP8 - Hitachi HD64180 CPU. Clocks 16MHz (pins 2 & 3), 8MHz (pin 64)
      61256   - 32k x8 SRAM (DIP28)
      6264    - 8k x8 SRAM (DIP28)
      IGS017  - Custom IGS IC (QFP208)
      AR17961 - == Oki M6295 (QFP44). Clock 1.000MHz [16/16]. pin 7 = high
      U3567   - == YM2413. Clock 3.579545MHz
      VSync   - 60Hz
      HSync   - 15.31kHz

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