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How sure are you that the card is oriented correctly?  I know you said it is, but... how sure are you really?  The cards that fit into the memory slot in a GS are traditionally facing "backwards" as far as their chip orientations go. The power supply whine is a dead giveaway as a dead short, as...

You're right, Skate323k137 - simply put, there is no such thing as booting from drive #2 in any slot.

They all fit the IIgs case.  The form factor is the same among all.

Regarding motherboards: ROM0 and ROM1 shared the motherboard they could plug into.  Of that compatible version of IIgs motherboard, there were two variants I know of: one had connectors populated for IIe-style power supply and keyboard (used in "stealth" IIgs cases, upgrading IIe machines) and...

Yes, it can.  There are some considerations - it doesn't have a cassette port, so you can't use a tape deck the way you could with the oldest machines.  And its default speed is 2.6ish MHz, so you will need to slow it down to 1MHz for most games to be playable.  But overall, it is very...

He can, but it won't make a ton of sense.  The operating system will be there, but no disk to operate on.  Even the virtual serial drive of ADTPro requires a *serial* connection - there's not an option to do that via audio.

You asked a bunch of different things, with different answers.  A daisy chain containing 5-1/4" drive(s) must have the 5-1/4" drive(s) at the end.  That is the most important rule.  On a GS, for example - all "slots" are virtual when it comes to plugging in drives to the back.  Daisy chained...

A picture is worth a kiloword, that's for sure.  Cards in the GS ram slot are "backwards" relative to all the other slotted cards.

Do you read French?  There are docs in AppleWorks on disks (not a PDF, though) on Asimov in the TML_Basic.zip package on Asimov: ftp://ftp.apple.asimov.net/pub/apple_II/images/gs/programming/basic/TML_Basic.zip They're viewable with a tool like CiderPress: http://a2ciderpress.com/

Ok, I found a copy of lambda.shk.  The files he's got essentially assumes you're going to be already booted to GSOS with a hard drive, then the game (and only the game) is on the floppy disk.  There probably isn't going to be room to have a functional GSOS _and_ the game on a single floppy.  So...

Thin items that don't require boxes can go in fixed-price envelopes; use the contact link to inquire about special pricing.  Most folks outside the US go this route since the PayPal postage calculator is extra zealous and doesn't know details like that.

It's indeterminate.  There are two types of cables like this - straight-through (typically used for a modem) and null-modem (typically used for a printer).  Your listing doesn't say which it is, but you need the null modem/printer one.  The straight-through type will not work. Looks like a...

See: https://groups.google.com/d/msg/comp.sys.apple2/0D6DteeOkwI/PGREujA4FswJ The ROM03 is far less noisy than a ROM01, and has more RAM built in.  You'll be much happier with it, especially if you do anything with GSOS.

It's more likely logic than capacitance, unfortunately.  And blindly replacing what might actually be good parts carries its own risks.

This is a level of diagnosis beyond me.  Someone smarter with an oscilloscope would be able to probe the 6502 /reset line and see if it is pulled low on startup vs. when you hit the reset button.  Then they would backtrack from there to see why it's not firing at initial startup.

So a physical reset starts it up.  That suggests that the 6502 isn't getting a reset signal on initial bootup... which could be a logic failure on the main board (that neither the POST nor the diagnostics picks up).

Understood.  The reseat trick is usually good for the intermittent gremlins like this.  Does it have anything to do with heat (i.e. once it's warmed up, it doesn't happy any more) or anything like that?

It's like it wants to work... have you tried giving each of the chips a little push to re-seat?

How'd you do that?

Is this the same, or different than the problem you reported here? https://68kmla.org/forums/index.php?/topic/29740-adt-image-transfer-aborted/?p=322122