VECTORLIST - The Mailing List For The Technical Discussion of Vector-Based Arcade Games

March_1999
RE: MM2114N RAM Replacement

From: Clay Cowgill ( )
Date: Mon Mar 29 1999 - 16:56:42 CST

> According to MAME this game uses a 6502 running at 1.5 MHz.
> No way will a 450 nS RAM keep up with that. Go with the fast
> part.
>
> (By the way, the NTE part is 300 nS).
>
That'll be fine. Running "balls-out" (not sure if that's a technical
term or not ;-) a 450ns RAM could serve data up at about 2MHz
(1/.000000450). Since the 6502 doesn't actually hit external memory
every cycle the actual number is considerably less than 1.5MHz... 450's
should work dandy.

-Clay

HOME