Memory IC's for upgrade

Por Opeth

Rookie (19)

21-03-2005, 14:12

Can I use this IC to ugrade the 128kb of my nms8250?

Conrad link

{Mod: changed the link}

Entrar ou registrar-se para comentar

Por HansO

Paladin (672)

21-03-2005, 21:52

Can I use this IC to ugrade the 128kb of my nms8250?

{Mod: changed the link}

Changing the link did not help dear moderator, it stays dead
Better Name the IC number, because this link gives a 'Fehler'

Por Opeth

Rookie (19)

22-03-2005, 10:16

These are the IC details:

IC 41464-150 53C464 71C464
Artikelnr.: 166570 - 8A

Type 41464
Geheugen 256 kb
Organisatie 64 kb x 4
Toegangstijd 150 ns
Techniek N
Behuizing DIP18
Raster 7,62

Por AuroraMSX

Paragon (1902)

22-03-2005, 10:19

Some data extracted from the wicked link:

Type 41464 
Geheugen 256+kb
Organisatie 64+kb+x+4 
Toegangstijd 150+ns 
Techniek N 
Behuizing  DIP18
Raster 7 62

HTH

[edit] Duh. Too late. nevah mind[/edit]

Por Opeth

Rookie (19)

22-03-2005, 13:06

Anybody idea's if I can use this IC for a mem.upgrade?

Por Alexandre_Taito

Champion (325)

22-03-2005, 13:12

The right IC should be 44256 or 414256. This is the chip used for 256 and 512K mods.

Por Alexandre_Taito

Champion (325)

22-03-2005, 13:12

BTW these chips are easy to find in old ISA VGA boards and some Vesa Local Bus ones.

Por Opeth

Rookie (19)

22-03-2005, 14:10

But can the 41464 be used to upgrade the ram to 384kb?
Or can I only use 44256 or 414256??
I started this topic because I read about the 41464 chips in on of these pdf's.
http://www.funet.fi/pub/msx/mirrors/hanso/hwdoityourself/
Is it the same chip I'm talking about or not?

Por Alexandre_Taito

Champion (325)

22-03-2005, 14:13

Well, maybe you read you should take OUT the 41464 and put IN the 44256 or 414256 ones...

Por Opeth

Rookie (19)

22-03-2005, 15:05

This is what I read:

512 kb Memory extra in NMS 8250, 8255 and 8280
Source: Hnostar 20, plot@intercom.es
Supplied by Bastiaan Huber, 2001
Converted to PDF by HansO, 2001

For it we will need the following chips: 12 RAMs 41464 1 74LS670 or 74LS170 1 74LS139 1 74LS125 First we must open the computer and to locate the RAM-chips, they are in a group of 4 (IC-133, IC-134, IC-135 and IC-136). Once located, we must cut pin 16 of each one of them, and bend them sideways. After that solder three 41464 RAM-chips on top of them, etc...