nesdev.org

was working on making an slrom eprom cart and had a quick question

The info for making one explains:
SLROM (mapper 1):


PRG socket:
Bend up pins 1, 2, 24, 30 and 31 (or cut tracks)
Solder pin 2 to hole 24 (A16)
Solder pin 24 to GND (OE)
Solder pin 30 to hole 1 (A17)


CHR socket:
Bend up pins 1, 2, 22, 24, 30 and 31 (or cut tracks)
Solder pin 2 to hole 24 (A16)
Solder pin 22 to hole 31 (CE or CHR /A13)
Solder pin 24 to hole 2 (OE or CHR /RD)


these are for a 27CXXX series, when I compare the datasheet for one I notice that 27CXXX chip has 5V for pin 1

Why is pin 1 left floating? shouldn't it be tied down to 5V?

thanks

You can leave it disconnected or tied anywhere: it's VPP and it won't do anything unless you put /WE down and connect that pin to >12,5V

thanks for the info!