Labels:crt screen | sky | windowpane OCR: 512K mod. for Macintosh with rev. motherboard Cut trace between pins pue on 47 Ohn solder side 16 +5v Vco NC Ram A9 A18 74F253 i1 INOA INOB 10 Gnd IN1A IN1B IN2A IN2B IN3 A IN3B Seven feedthroughs OEA OFF near location F 7 On GND rev motherboard T Slaight 8/31/85 rey Instructions: 1 Remove 16 64k RAM chips and replace them with 200ns faster 256k RAM chips PPU 74F253 multiplexer chip and 47 ohm resistor as shown above acintosh therboard Instruc tions
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