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
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 + Ultimate 1MB, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k +APE Warp) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg), 1040STF long button floppy, 2x 1040 STFMs + Gotek, 2x 4160STE with 32Mhz booster, ROM switcher, Mega ST1, Mega ST4, not to mention various bare ST boards for testing including a PAK 68/2
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...