upgrading A500 to 8MB fast ram

[rkauer]

 I think is better to source those regular 514400-60ns DIP chips instead.

 You can find them in old ISA video cards, like Trident and others. Also findable NOS in several electronic sellers around the 'net.;-)

[rkauer]

 For your information: those chips are (electrically) pretty identical to the ZIP versions (used in a variety of old Amiga expansions) with the exact same code, albeit the different form factor.

 I don't remember the exact VGA card name right now, but I'm sure someone will point it.

 Those cards are from the 286/386 era, so expect to find them in 256 and 512kb VGA ISA cards, in peecee junkyards.

[rkauer]

 Each chip is 256k x 4bits (444256 or 514256), so expect to use 8 chips for a humble Mb!

[rkauer]

kamiga wrote:

You mean each chip is 1M x 4-bits, right?  Those are the ones I need.  16 * 4megabit chips = 64 megabits = 8mb.  The 14400's.

I currently have the 514256's, 16 * 1megabit(256k * 4) chips = 16 megabits = 2mb.

Now do the video cards you are talking about have the 14400's or the i-already-have smaller 514256's?

I'm confused.

Keith

 Look for old peecee 286s too, they use the chips also.

 For better explanation: those 514256 and 44256 are 256k x 4bits (= 8 chips to achieve 1Mb). The 514400 is 1Mbit x 4bits (=2 chips per Mb).

 Look for VGA boards from Orchid, Trident and some Vesa boards too. Prefer those who have 60ns chips on it.