Boards Sega Mega Drive II (Model 2) VA1 — PAL (Mega Drive II) IC1
IC1

MC68HC000FN8

CPU PLCC-68 Sega Mega Drive II (Model 2) VA1 — PAL · Mega Drive II
Motorola 68000 main CPU (low-power HCMOS version, 8 MHz grade) in a 68-pin PLCC — the Mega Drive's main processor.
Datasheet
ENC1 IC4

Other components on Sega Mega Drive II (Model 2) VA1 — PAL

CART1 ENC1 IC1 IC4 IC5 IC6 IC7 OP1 OP2 OSC1 REG1 WRAM

About this component

Runs the game code from the cartridge, with 64 KB of work RAM and the VDP inside the 315-5660 ASIC. The HC000 is the CMOS version of the 68000 and is a drop-in for the original NMOS part; FN means the PLCC-68 package and the 8 means it's rated for 8 MHz, run here at about 7.6 MHz. A missing clock, a stuck address/data line from a failed RAM, or a bad cartridge slot can all make a working CPU look dead, so check those first. The pin table here is for the PLCC-68 package only — Model 1 boards up to VA6 use the DIP-64 version, which has a different pinout. Sources: https://www.nxp.com/docs/en/reference-manual/MC68000UM.pdf , https://consolemods.org/wiki/Genesis:Motherboard_Differences , https://www.copetti.org/writings/consoles/mega-drive-genesis/

Pinout & readings

Pinout and readings are for members

Create a free account to see the test data for IC1 (MC68HC000FN8):

  • The full pinout — 68 pins with what each one does
  • Datasheets
Create a free account Sign in