27C512 vs 27C256

Reply Subscribe

Thread Tools

Search this Thread

01-14-2007, 02:45 PM

va454ss

Senior Member

Thread Starter

iTrader: (1)

Join Date: Feb 2003

Posts: 785

Likes: 0

Received 0 Likes on 0 Posts

Car: 90 454SS

Engine: 454 TBI

Transmission: TH400

27C512 vs 27C256

Are these interchangable?

Reply Like

01-14-2007, 06:47 PM

Grim Reaper

TGO Supporter

Join Date: Jul 1999

Location: The Bone Yard

Posts: 10,907

Likes: 0

Received 3 Likes on 3 Posts

Car: Death Mobile

Engine: 666 c.i.

Not directly.

Reply Like

01-15-2007, 11:51 PM

HaulnA$$

Member

Join Date: Jul 2003

Location: Dallas

Posts: 458

Likes: 1

Received 2 Likes on 2 Posts

A 27C512 will work in place of a 27C256 bit not vice versa. To make the 27C512 replace a 27C256, you must either stack the 32file into the chip twice or burn the file into the upper 32k of the 64k 27C512. This page on Ludis' site has the pinouts of both PROMs. Seeing them may help to clear it up. http://www.cruzers.com/~ludis/p4pinouts.html . HTH