520 STFM 256kx4 DIL to 1Mx4 SOJ

Upgrade your RAM from ST to Falcon.
gman
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Joined: Thu Aug 01, 2019 9:48 am

Re: 520 STFM 256kx4 DIL to 1Mx4 SOJ

Post by gman » Fri Aug 02, 2019 1:15 am

exxos wrote:
Thu Aug 01, 2019 12:23 pm
gman wrote:
Thu Aug 01, 2019 12:19 pm
1: what's the resistor on the cable "manually connect A9 (pin 5) to the unused MMU pin 64."?
When you upgrade the RAM from say 1MB to 4MB you need a extra address wire, which is what A9 is. Basically without it, your new chips would be "stuck" with 1MB for example.
Thanks for the reply, Did I miss read your store page and you don't sell a 4MB RAM kit for this board?
This is pretty good info here, but having the correct parts and a more detailed guide would be great!

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Re: 520 STFM 256kx4 DIL to 1Mx4 SOJ

Post by exxos » Fri Aug 02, 2019 8:14 am

gman wrote:
Fri Aug 02, 2019 1:15 am
Thanks for the reply, Did I miss read your store page and you don't sell a 4MB RAM kit for this board?
This is pretty good info here, but having the correct parts and a more detailed guide would be great!
I do not do a kit for 4MB kit for that board no.
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

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