Connecting a Macintosh iisi to a VGA monitor

[rmoat]

@croissantking Which DB15 adapter do you use? After feeding ChatGPT my settings that worked w/ the Dell monitor, which it believes that specific Dell model doesn't support Sync on Green, I also asked it about the Apple Multiscan 15AV and the MacView adapter. I've attached the picture using its response. Also I believe I found a website that sells the MacView adapter for around $9. Luckily I was given a free Power Mac 8500/120 that came with the DB15 adapter. Also, ChatGPT seems to think that the IIsi and IIci do not put out composite sync, but AI also may not be completely accurate either.

 

[finkmac]

you know, we could put words into chatgpt ourself if we wanted to? why clog up the forum with ai slop answers?

 

[croissantking]

@croissantking Which DB15 adapter do you use?

Griffin Mac PnP.

I pulled up Bomarc’s IIsi schematics and looked at the pinout for the monitor output. It has composite sync as well as V sync and H sync on separate lines. Now I’m even more confused - I thought the reason these machines wouldn’t sync to my 15AV was due to lack of separate sync signals.

Edit: BMOW comes to the rescue

 

[rmoat]

you know, we could put words into chatgpt ourself if we wanted to? why clog up the forum with ai slop answers?

@finkmac I did my own research for the monitor I have and without ChatGPT. I'm using ChatGPT to help @croissantking out, because there are so many variables for why something works or doesn't, especially with various hardware combinations and the inability to test. Maybe you can answer this last question about the 15AV?

 

[rmoat]

Griffin Mac PnP.

I pulled up Bomarc’s IIsi schematics and looked at the pinout for the monitor output. It has composite sync as well as V sync and H sync on separate lines. Now I’m even more confused - I thought the reason these machines wouldn’t sync to my 15AV was due to lack of separate sync signals.

Edit: BMOW comes to the rescue

Nice find!! I'll read over this as well.

 

[croissantking]

Reading @bigmessowires’ explanation, the TLDR is that the IIsi/ci only switch on their separate sync signals when a portrait display is connected, at the rather useless (for a multisync display) 640x870 resolution. Otherwise, it puts out CSYNC and SoG. So @rmoat your Dell LCD would work even if it just supports CSYNC; my 15AV doesn’t support CSYNC.

I should probably order one of BMOW’s sync splitters one day.

 

[finkmac]

@finkmacI'm using ChatGPT to help @croissantking out, because there are so many variables for why something works or doesn't

i don't think adding a computerized lie generator into the set of variables helps much.

 

[adespoton]

i don't think adding a computerized lie generator into the set of variables helps much.

It's not a lie generator. It has no intent or concept of whether what it is saying is true or not. It's just a probability sieve. And sometimes what it thinks is probable is something I haven't thought of myself -- sometimes because I've never seen the source material that it was trained on. And sometimes it's able to consider something probable that I've never even imagined as plausible -- because it isn't. But the sieve doesn't care; it's just a sieve. Of course, what it tells me may not be the same as what it tells you, due to the intentional addition of randomness into the path selection.

On this topic, it'll either get you to a real answer, or it won't -- at which point, hopefully it will be obvious to the rest of us without having to read through a bunch of documentation.