Logic chip cheatsheet

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74xx04

74as04.png

The 74xx04 is a hex inverter.

74as04sch.png

Used in some MVS for the Battery-backed RAM, in the AES for the color burst oscillator and main system clock and also in the AES and some MVS for the Memory card interface.

Found in DILP-14 packages.

74xx32

74hc32dip.png

The 74xx32 is a quad. 2-input OR gate.

Used in the MVS for the Battery-backed RAM and also in the AES and some MVS for the Memory card interface.

Found in DILP-14 and SOP-14 packages.

74hc32schematic.jpg

Memory card interface

  • 3A: 74HC259 PIN 7
  • 3Y: 74HC32 PIN 2
  • 5A: 74HC32 PIN 12
  • 5Y: NEO-G0 PIN 51
  • 6A: CRDC
  • 6Y: 74HC32 PIN 11

74xx05

74ls05.png

The 74xx05 is a hex inverter.

Used in some MVS for the System ROM mapping circuit, and also in the AES and MVS for the Video DAC.

Found in DILP-14 and SOP-14 packages.

74ls05sch2.png

Memory card interface

74xx06

74ls06.png

The 74LS06 is a hex inverter.

Used in the AES and some of the MVS for each of the player's OUT1, OUT2 and OUT3 controller ports.

Found in DILP-14 and SOP-14 packages.

74ls06sch.png

74xx244

74ls244.png

The 74xx244 is an octal 3-state buffer.

74LS244sch.png

74xx273

74ls273dip.png

The 74xx273 is an octal D-type flip-flop.

Used in the AES and MVS for the color bits.

Found in DILP-20 and SOP-20 packages.

74ls273sch.png