The chips can safely and easily be removed off a board destined for the garbage by using a heat gun like one for heat-shrinking tubing. The SMD parts just drop off!
Not recomended for work on good boards however, as the board will likely be damaged by the heat!
I O' scoped and metered the Satandisk 5V and 3.3 V supplies and did not see any droops or artifacts when executing a large un-zip on a file on drive C (the Satandisk with a 1 GB SD). I will do more checking this evening. I also tried formatting a 128MB SD card in my PC (FAT 16) with hopes of creating a PC-Atari transfer chip. When placed in the STE the SD partitioning step failed and the chip was unreadable by either system. I really think something is wrong with the STE. I'll try some more SD cards soon. Are there any utilities to test the inner working of the STE to determine if it is a MMU problem or a Floppy Drive Controller problem? I'm thinking that since all my efforts to load software and fles to the SD card are using the Floppy Drive, the data corruption itself may be coming from the FDC as data is read into the STE.
Is there error checking on this stream.
As I understand it, TOS 2.06 self checks the TOS ROM checksums when TOS is started. So if they work, I can assume the TOS ROMs are not to blame. Is this correct? I burned these TOS chips myself from a master set of TOS 2.06 ICs.
Is it recomended that I replace electrolytics in the STE? Any in particular?
I have a ST 1024 with TOS 1.04 that I'll try with the Satandisk as well to see if that works properly.
It is still curious to me that BOTH STE's have this problem..... I feel I have to solve this and it must be solveable! I have some ST Mega2's kicking around that I could take parts off of - if they are compatible. Does anyone know if the MMU or FDC chips in the ST Mega 2 are the same as the STE?
If I get these STE's up and running I hope to perform the HD FD mods so I can use 1.4 MB floppies. They will then be used in my computer music studio.
Thanks for your ideas. If anyone has any more ideas or info please post!