C103253 REV.5 - STFM 1MB Upgrade

Upgrade your RAM from ST to Falcon.
User avatar
rubber_jonnie
Moderator
Moderator
Posts: 1362
Joined: Thu Aug 17, 2017 7:40 pm
Location: Essex
Contact:

Re: C103253 REV.5 - STFM 1MB Upgrade

Post by rubber_jonnie » Sun Aug 25, 2019 9:50 am

terriblefire wrote:
Tue Aug 20, 2019 7:39 am
I did a video way back of this job. It was a nightmare and those SOJ chips never stayed soldered down properly. :/
You're so not wrong, everything looks fine, and I've cleaned up a few spots with solder wick where it was bridging connections, but I just get a black screen with white borders on power up, or a red crashy screen if I boot with my diag cart plugged in, so next steps are to have a prod around see if there are any shorts I can't see under the chips, which I'm not looking forward to.

Whilst the chips appear to be nicely soldered down, it's difficult to tell, even with strong magnification, if any of the pins are not connected.

I kind of wish I hadn't started down this road now, but at least I can remove them and get it running back at 512MB if I can't fix it.

:( :( :(
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

User avatar
exxos
Site Admin
Site Admin
Posts: 7857
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: C103253 REV.5 - STFM 1MB Upgrade

Post by exxos » Sun Aug 25, 2019 9:57 am

Can you get anything over serial from the diag-cart ?

I tried to solder one of those chips once, drove me nuts. Then I took to the heatgun, and the PCB warped, so I just vowed never to try it again :lol: :roll:
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.

User avatar
PhilC
Moderator
Moderator
Posts: 1812
Joined: Fri Mar 23, 2018 8:22 pm

Re: C103253 REV.5 - STFM 1MB Upgrade

Post by PhilC » Sun Aug 25, 2019 10:27 am

I was going to try this upgrade. Dont think I'll bother now
If it ain't broke, test it to Destruction.

User avatar
rubber_jonnie
Moderator
Moderator
Posts: 1362
Joined: Thu Aug 17, 2017 7:40 pm
Location: Essex
Contact:

Re: C103253 REV.5 - STFM 1MB Upgrade

Post by rubber_jonnie » Sun Aug 25, 2019 10:35 am

exxos wrote:
Sun Aug 25, 2019 9:57 am
Can you get anything over serial from the diag-cart ?

I tried to solder one of those chips once, drove me nuts. Then I took to the heatgun, and the PCB warped, so I just vowed never to try it again :lol: :roll:
So far no heat damage, the solder is relatively low melting point, and I used kapton tape to insulate other components.

There are several problems here:

1. Although the pads are relatively large, chip alignment is quite difficult, and perhaps a jig may have helped.
2. The pins on the chips, despite looking even, didn't always solder correctly.
3. There is no way to see under the chip and check for shorts, even with a strong magnifying glass and really bright light.

On a positive note I have improved my hot air techniques and don't seem to be scorching/burning/warping anything any more!

I need to decide do I just remove and stay 512KB, which is a pain, or go for it and troubleshoot.

In terms of serial, is it a case of plugging in a laptop via serial and using telnet or similar over serial to connect whilst powering up to see messages?
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

User avatar
rubber_jonnie
Moderator
Moderator
Posts: 1362
Joined: Thu Aug 17, 2017 7:40 pm
Location: Essex
Contact:

Re: C103253 REV.5 - STFM 1MB Upgrade

Post by rubber_jonnie » Sun Aug 25, 2019 10:36 am

PhilC wrote:
Sun Aug 25, 2019 10:27 am
I was going to try this upgrade. Dont think I'll bother now
Yeah, it's a bit arse.
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

User avatar
exxos
Site Admin
Site Admin
Posts: 7857
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: C103253 REV.5 - STFM 1MB Upgrade

Post by exxos » Sun Aug 25, 2019 10:42 am

rubber_jonnie wrote:
Sun Aug 25, 2019 10:35 am

1. Although the pads are relatively large, chip alignment is quite difficult, and perhaps a jig may have helped.
2. The pins on the chips, despite looking even, didn't always solder correctly.
3. There is no way to see under the chip and check for shorts, even with a strong magnifying glass and really bright light.
Know those issues. Its one set of issues I had with the CPU soldered down on the later STE boosters. Only takes 1 pin... They all look soldered down, but normally 1 pin which is sat "in" the solder, but not actually soldered. Wiping all the pins with IPA before soldering does help, but can't solve bent pins, or pins which look OK, but are actually bent.. total PITA.

Because of all the socket issues, I went to just soldering the CPU on the PCB.. but that created even more issues, to the point, the evil sockets were lesser of the 2 evils :roll: Then there is all crazy "tolerances" on the GALs... argh....

rubber_jonnie wrote:
Sun Aug 25, 2019 10:35 am
In terms of serial, is it a case of plugging in a laptop via serial and using telnet or similar over serial to connect whilst powering up to see messages?
Yep.
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.

User avatar
rubber_jonnie
Moderator
Moderator
Posts: 1362
Joined: Thu Aug 17, 2017 7:40 pm
Location: Essex
Contact:

Re: C103253 REV.5 - STFM 1MB Upgrade

Post by rubber_jonnie » Sun Aug 25, 2019 10:50 am

exxos wrote:
Sun Aug 25, 2019 10:42 am

In terms of serial, is it a case of plugging in a laptop via serial and using telnet or similar over serial to connect whilst powering up to see messages?
Yep.

Will give it a go, see what turns up then.
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

Post Reply

Return to “RAM UPGRADES”