digging in the board this image is accurate i did it some years ago
i found this image again now i have it too mind
its a rev d-k but the same stuff in rev a-c with ram
but just unplug the ics.. and store them
viewtopic.php?f=27&t=19784&p=172844&hilit=stram#p175087really the only solder i see with most rev a-c is to recover the mad9 signal from the boards MCU pin 34 via a 33R or 47R resistor
mounted on the simms boards...
it is needed to enable the extra 4 banks of dram on any TT onboard stram i will use 70ns ram as simms...!
its usually floating not tied to a voltage so you dont need to pull the pin off the pad etc just solder on a kinar wire.. to the pad
easy stuff im old now 47 so use a head set mag .. easy from ebay my dentist swears by the one from this site for his glasses
http://sewwhat.com/SWE/ glasses mounts
so in effect with rev a-c if you have dil chips in socket
then 1 solder carefull!!!! as its smd and you have 8MB onboard stram two simms add back the 2mb rev 1 card {not easy to upgrade}
then you have 10MB stram
an upgrade to rev a-c for 8MB ram is a good idea .. plug in is the way i feel
tell me 20 members ill make up the simm socket mount pcb.
as far as i know rev AorB has socketed mcu plcc
where rev c - k has smd mcu.. i have lots of boards belong to chandler most work need chips need for them
but a great referance...
so only 1 solder stram onboard to 8MB any takers for this??? i need 20 members to make it
and ill pub it as usual if you want to wrap it yourself and need a kick
ps to mod a rev d-k as pictured
you dont need to remove the pcb
just clip the ram pins remove the pins and suck out the solder
resolder from above
no need to demount the pcb
same as any upgrade to ANY atari
just clip off remove the pins and solder from above...
its best with any atari to leave it in its lower metals at least
forinstance a falcon will not boot if you remove its lower metals and sockets screws..!!
the point is you can add 8MB to any TT onboard with this kit then add a 2MB card
i think rev2 ram belongs and is usually found with rev d-k boards
but there is a solution for sure
the kit will be 2 4MB simms tested fpm and two sockets on pcb
with plug in pins wired and heat shrink to each pin high quality
tagged as per address per the pictures
easy stuff one solder.. to 8MB tt onboard {reva-c}
as the pic says a rev d-k is harder as youll need to desolder etc etc...
seems the tide turns now
some double sided tape or some fixed pins to hold the simms in place needs machined
you will notice the banks are interlaced in address every 4 bits {nibble mode} so watch out.. if you mount your own simms
its does matter !!! so follow the rules here
2 simms are addressed as two nibble interlaced banks of 4MB as 32 bit but flow as 64 bit through the funnels... funeled to 32 bits
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