NEO-SDR-T



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:

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