NEO-SDR-T

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Chip found on MV1B and MV1C slots. Handles Z80 subsystem address and port decoding, Z80/68K communication latches and interrupt generation, similarly to NEO-D0. Handles 2 player I/O as well.

Draft pinout: File:Neo-sdr.odg

Pinout

NEO-SDR

  • 1 VCC
  • 2 VCC
  • 3 GND ?
  • 4 VCC
  • 5 VCC
  • 6 VCC

68k:

  • 65 D0
  • 64 D1
  • 63 D2
  • 62 D3
  • 61 D4
  • 60 D5
  • 59 D8
  • 58 D9
  • 57 D10
  • 56 D11
  • 55 D12
  • 54 D13
  • 53 D14
  • 52 D15
  • 51 GND
  • 50 GND

Z80:

  • 49 SDD7
  • 48 SDD6
  • 47 SDD5
  • 46 SDD4
  • 45 SDD3
  • 44 SDD2
  • 43 SDD1
  • 42 SDD0
  • 40 NMI
  • 29 MREQ
  • 28 IORQ
  • 27 Z80RD
  • 26 Z80WR
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