TT rev a-c to 8MB onboard using simms add back the 2MB STRAM riser board or rev2 stram boards.. upgrade to 8MB offer

[Guest]

hi all with 2MB dil type stram cards

i am going to provide a chip on board tested set... of replacement dram 70ns per ic fpm
perhaps even 2bank 72pin simm 8mb 60ns FPM
one mcu one simm

so you can just de-solder and clip off the dils and replace them done chips soic to dil
no big pins and a nice fit

you buy and fit or get fitted 16 risers
and a link too the right mad{memory address } line between each chip
as a set

its easily done with a riser provdied with the chip mounted
and the small pins below {.5mm}
dil to soic .. ram done you get to plug in 1Mb chips too dil direct


its not perfect but ill do my best to provide a strip 4mb simm to chips and mount as made up soic to dil so soic mounts of the board on top
and dil below as two rows of .26 mm pins not hard set so they can also be used in sockets
perhaps for the amiga guys....


very kindly qq1975b has allowed me too keep his 2mb dil for tests and ive packed up and will send him a rev 2 8MB card tested i have two so if you need a 2MB card that is rev 2 is easy rev 1 im working on .. lots of rev 1 to upgrade from 4mb simms stripped or using new ic's soic

now i have a dil board ican measure and make up a risers so one board over mounted will allow 8MB with just clip off and add on or send for change to any member share chips

[Guest]

im working too use a 8MB 72pin simm as two banks 4MB each just one simm for the older rev A card with dil ic's
nice now i have permission to hack this rev a card ..
so two banks on a 8mb as add on i think with just a little effort you can get 8MB on old 2MB stram dil chips boards
you also need to make all the connections remove the right chips and caps and solder in the upgrade board
i ll document it all

give the ink time dry on that

i think their is two methods of diy for rev A boards with dil chips
add 16 risers of 1Mb chps or an 8MB simm

so ill rework to allow for a single 8MB stram from REVA dil


so paws aff ul make it uo,,,

[Guest]

spent most of the morning on drawing up an upgrade board {ive mostly finished the schematic so far}
for the STRAM 2MB rev1 boards to 8MB
this is the dil type ics hard to get Very hens teath 1Mbx4 dil

the means is to simply clip off the old ram and caps
desolder all {some ill provide a template} the holes and mount the board solder on its pins that come thru


adding two wires carefully for the extra MAD line from the mcu
too the spare buffer pins and a single wire to the board from the output of the spare buffer line
all will become clear when i pub it later {very beta so just for viewing }

so can easily be done by anyone if you like doing jobs like this
just adding the pcb and solder thats it
ill pub the board design anyway... incase you want to build it yourself
ill try to make it double sided without thrus perhaps a few jmp

the chips are on it already smd
no need of any simms etc
8MB FPM 70ns

as usual ill do it if you cant be bothered
its flat to the top and fits perfect flat if you also remove the older dils bypass capacitors {not needed}

ive clipped off all the old chips and caps {need a new pair of cutters from ebay}
so ill carry on to level the connections then out with the de-solder tool
more pics and schematics tomorrow

[Guest]

hi all

i managed to aquire a whole pile of 4MB simms {50}
they are wide spaced 8 chip per side siemens FPM they are all 60ns speed

ive done so far two stram boards with them and zero issues very easy to desolder using hot air

anyway

this offer is still on

i am surpised more people dont wish to update there stram board if its a 2MB type

the rule is
send me a soic chip {revision 2} 2MB board and ill stick 8MB on it {2X4MB simms}
then your TT will have the max 10.240MB

so the revision 1 boards with dil chips
i have made a design up in proteus vsm and im laying out he pcb for a production run of 20 units
you simply clip off the older dil ics and desolder some holes
mount the board and solder on
or you can send it too me and ill upgrade it
some time till i check its all fine after i get the protoboard back from the fab...


as above
you send one as soon as it arrives ill send back a tested 8MB board...
and update the one you send

so.. easy this way...

[qq1975b]

No way to break that 10MB STRAM wall?

[Robson]

I'll post mine (2MB DIL version) to you Simbo once my "TT beaving badly" is sorted. OK?

[Guest]

give me some time for the dil version im still woring out the exact pcb
as the method i use for the dil version is very different
and is a conversion that can be done by a member with a solder iron/desolder tool + a pair of clippers and a pair of radio plyers

so perhaps no need to send it

the dil version is a bit harder to upgrade in someways and easier in others

ill post when ive done the proto and the results are good



the only way to get more that 10MB STRAM is too use voodoo....
its not the ram its the way the address space is used by tos
perhaps in the future
however remember its 64bits memory not 32 so needs twice as much work
i for one dont plans to even need more than 10MB as you can once booted up
load everything {even tos} to fast TTRAM so the STram just runs the background loading etc,video control etc,,

[Robson]

No probs...the TT is not heavily used anyway.

I want to get it up & running again with the crazy dots working (but will post in that thread).
viewtopic.php?f=27&t=28183

[Guest]

No probs...the TT is not heavily used anyway.

I want to get it up & running again with the crazy dots working (but will post in that thread).

place a link to the topic for your TT
then all the people who see this will see yours... more easily
half the point is too link the topics that are the same

i see the board now offers similar threads so.. adding a cross link is a good idea
and binds things

[Guest]

No way to break that 10MB STRAM wall?

did think of one idea

virtual STRAM within TTRAM .. as a mirror

perhaps a 32MB slot or slots X4 is better... for the driver...
this depends on loading boot blocks and some software work on a loader
easy if a driver and loader system is made and all o/s choices made from post bootup to stram...
surely 10MB is plenty

a test would be
load up all you want to use in an session and see what its weight is

[Robson]

i see the board now offers similar threads so.. adding a cross link is a good idea
and binds things

Sir yes Sir. I've added the link to that comment.

Ehh...doubled the post somehow...I submitted it for deletion.

[Guest]

both rev 1 with dil chips and rev2 with soic are aok to upgrade to 8MB
rev 2 is not easy rev 1 perhaps the same 50/50

so you need to prepair the rev 1 board like this very long process
not easy.. but i think rev 2 is not easy also less solders too make just as much prep

but has too be done to upgrade the old boards too 8MB we have no choice.. here
clip the chips pins close to body
then desolder the pins with tweezers
then clean the holes with a desolder pump...
a long process takes about 3 hrs for me....
so next is extend to the resistor packs spare pins {clip its pins from ground ill doc what too change}
or use a resistor for the added address line from the MCU ic {its the same mcu ic used on the TT for its ram}
to the new ram boards added address to its chips {soic from old 4MBsimms}
and two pins on the mcu need changed
{replaces the jumpers that are on the rev2 board }
so to make a 8MB rev 1 board..
the added board above the ram will have 16 ic's on it and solders on top of a preped board.....
not easy but not too hard as a project... i have a few holes still to clear from solder
so ive already measured up for the top mounted board
the other way too do it is too use soic risers they are a pcb that change dil to soic
you still need to add the missing address and fek about
so the board populated and tested before solders is easier

i think 8MB boards now are hard too find and we need to make best fit here...
best has none i think i dont see them on ebay now as new so.. stocks are low...

dil chips the right size 1MB by 4 wont work because the physical lines on rev 1 boards are missing as are the size jumpers
i think only one pin on the mcu needs changed to allow for 8MB ram
and an added {mad11 ? } address line from it yes mad 11

so the rev 1 board addon will be

prep the board as here

then direct solder too the holes that are cleaned etc

add one wire too the mcu for mad 11 via a 68R resistor or use the spare 68ohm on the res pack
and short one pin ... on the mcu too allow for 8MB not 2 ..

the main point is all the rev 1 boards with dil chips
cannot be upgraded by changing the chips only
needs better chips and one wire added one resistor
and one mod too the mcu pin select mem top

[Guest]

qq1975b big thanks for donating his rev1 board i spent too much time with in exchange for a rev2 upgraded

as i said since i stopped working in the last 6 days ive got more done than the last 6 months !!!

[Guest]

so

after some thinking

i decided that

as rev a-c TT {daughter board and or with gold top 68030}
that mostly will be the ones with rev 1 stram addon board {see above pics dip dil } say 2MB as they are
mostly have socketed ram dip dil...
then simply upgrade the mainboard to 8MB and add back an unmodded 2mb stram card rev1...
to give the max 10.240
too this effect ill draw up a schematic and details to upgrade a TT reva-c to 8MB onboard using two 72pin simms
already did it a few years ago...

in 72pin simm sockets using some sets of pins strips set to size etc very easy...!! is the plan...
its easy!!! just unplug the dip dil chips and plug in the simm sockets {pin strips} pcb add the two 4MB simms too them

easy enough for a basic knowlage person to do....

i drew up a thin board that yields all the signals for the simms
but deals with the needed capacitors and power for the simms
gives two rows of connections data and address cas and ras we thats it
so wiring is easy... as draw by numbers

i think i can supply the boards with the sockets added and wired to pin strips and two 4MB simms {tested}
some tape tags on the wires to ident them for pluggin in the pin strips i use are the same pitch as dip dil chip pins
so wont stretch the sockets

to just plug in... no destructive stuff or solders... is the plan

need some people too say yes simeon this is the way too do it and i want one
and i will... ??

if i get say 20 members this is a run of 40-50 simms and pcb so is worth doing
ill pub the details anyway..

i need 380 for the pcb for the magnum tts i have 275 in the fund so far
and owe out a bit also i used for parts

so being transparent i will be able to knock out these i think less than 40 quid all in and wired up to go..

i did also think about using sipp ics you can find them but are not as cheep as simms
4MB fpm simms are $1 each...

[Guest]

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#p175087

really 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

[Guest]

read the posts above first!!!


so
to mount 8MB to the mainboard rev X youll need 1 solder rev a-c many more rev d-k


to upgrade a rev 1 stram board is not easy as you either need to gather the addresses from the port
or from each old dil as shown
its a long road of realisation
as its two bank nibble mode per bank as needed
so upgrading the mainboard is a better path,,,for sure too 8MB
then add back the 2MB riser is the plan

the small simm socket mount pcb will have mad9 resistor {connects to pin 34 of the mcu one solder easy}
if i get 20 members this is 40-50 boards for the simm sockets so is worth doing...

,,, perhaps more
ill use kinar wire and wire wrap and solder,, then slide over a heatshrink to seal the wires old school methods... but works well
mass production a pcb then wires and plug in is the best i can think of ??
tag name etc

perhaps someone wants too give me help .. then youll get a box of bits to wire up
make a few bucks for your time


read the posts above first!!!

[Guest]

read the posts above first!!! take your tablet or laptop to another place !!!


ill post a pic of a rev a-c with pinout as above rev d-k pic

and simm wire up in proteus pcb is done double side thru plated
so pads dont get tugged off
three rows of named pins from each simm and a power supply so power address data and ras cas strobes and WE pin
added resistor for mad 9 from mcu pin 34
one solder plug in simms banks,, pretty good...
so the simm socket and pcb is a unit and can be used in either bank

one bank is 4 bit deplaced from the other to preserve the nibble mode nature
ie addresses 1234 and 5678 are different simms 9 10 11 12 and 13 14 15 16 etc
nibble mode addressed...

you have 64 bits in atari TT stram
32 bits and 32 bits 4 bit interlaced ,,,

so

its just an upgrade to any TT to 8MB onboard ram

if you use 32 bits on two simm banks like a pc then you destroy the nibble mode
it will work and boot but the TT wont work as well at all
so 4 bit nibble mode is really needed inside the TT for sure...

[Guest]

still to refine it but here is the proteus stuff for the simms boards
generic break out and support for the socket...

you can open them with proteus demo from labcenters site

few vias i auto routed it prob ill manual route it again
and ill add the names for the 32bit data and mad lines ... etc ras banks need 1,3 and 2,4 connected as a,b cas 0-3 as normal 1-4

[dibasber]

Hi i have a board like these
See picture
Can it be done?

image.jpeg

[frank.lukas]

... it is not impossible, but is it a lot of work.

Can be done using two 4MB FPM PS/2 Simm ...

Using the newer SMD Version from the Card is much better.

[talrek]

Hi,
do you still upgarde cards ? if so i'm interested... But i assume the price will not be the same, i live in France...

[edingacic]

i just got my TT030 it has 4 mb ST and 4mb TT ram what can I do to make it better here.... noting that I use CuBase score with MIDEX+ and need to stay compatible...

who do i pm i see only says guest

[frank.lukas]

Ask Lynxman, he can upgrade your 2MB ST Ram Card to 8MB. No matter the old DIL 2MB Board or the new SMD Board ...

-> http://forum.atari-home.de/index.php?to ... #msg216235

[Icky]

Ask Lynxman, he can upgrade your 2MB ST Ram Card to 8MB. No matter the old DIL 2MB Board or the new SMD Board ...

-> http://forum.atari-home.de/index.php?to ... #msg216235

Thanks for the pointer Frank. Have been working on a board from Lynxman this weekend. A lot of desoldering hoping to get it cleaned up and assembled tomorrow.

[damanloox]

Is it possible to upgrade RAM on the TT motherboard directly...?