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the mactcp programming reference, which includes a bit on icmp, is on the garden; there are lots of examples for drawing in the menu bar, such as my own m1max.

Given MacTCP's foibles, you would probably be better off doing it as a background application ('appe') if you don't mind being restricted to system 7. Then it wouldn't be too hard, although I'm not sure how reliable the MacTCP ICMP API is

The ROMs you can, but the SWIM isn't a ROM.

The SWIM isn't a ROM chip, it's an integrated logic chip, so I'm afraid you're stuck looking for an original of that one.

Yes, it's when the driver is first opened.

All of this is good sense. "Am I connected to the Internet" is a far more complicated question than it sounds, and "the Internet" isn't really a thing that exists anyway (he said, annoyingly). And MacTCP's API design makes it worse, I'm afraid.

If the driver is well-behaved it ought to be, at least under A/UX 3. A/UX 3 runs the mac display driver in a kind of demented cradle, lying to it frantically to try to stop it realising it's not running under MacOS. Note though that this is not the same demented cradle that other bits of Mac...

Buying anything off Amazon where quality matters (and I mean quality in a very basic 'is it actually what it claims to be' sense) is probably a mistake. MG are reputable as far as I know, I used to use their solder. The current flux I'm using is a TermoPasty one which I like a lot, and their...

that sounds like you're using a massively too-aggressive flux - you're not accidentally using like plumbing flux or something are you? (if so, you wouldn't be the first...). I just use ordinary pine rosin based flux, personally, and it works well enough for me (although I don't do a huge amount...

what a weird and parochial statement to make

Yup, as @bibilit says, you'll be fine to work on the low voltage stuff, including the drives. I appreciate your caution.

Nope, AUI stuck around for ages after twisted-pair was standardised, for thicknet and thinnet use (which were current standards at the same time)

this behaviour is on specific cards that were designed/released before 10BaseT was fully standardised in 1990, and which generally have both AUI and 10BaseT ports. Autoneg is backwards-compatible to that first standard, but cards that do not strictly follow that standard are apt to get confused...

One of the projects in my backlog is a five-port ethernet switch that just has a physical button next to four of the ports for 'auto' or '10/half', for old computer hobbyists who want to be able to set this but don't need the overhead of a real managed switch. At the moment all my community...

Yeah if you have that option do this

You've probably already checked these, but just in case: You have the EtherTalk software installed and known working? It's not just that the OS install has broken Ethernet? This isn't one of those cards that needs 10/half is it? If you have an old hub, sticking it between the card and your...

that's rather nice! Good stuff.

this is why this machine is fun, nearly everything about it is unhinged. even the design of the hinges (har, har)

The docking port, which is an interesting beast. In the mode where it talks to a mac, it's multiplexed PDS; I don't know if that's what's going on here.