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First of all, you need to learn the communication protocol between the VT terminal and VAX. And of course, learn the relevant parts of the terminal protocol. Only when you understand completely, how they talk between them, you can start your application design.
Since terminals from these old days where dumb devices, I suspect that this communication protocol is heavily based on the VT terminal features (only my guess). So, VAX knows exactly, which terminal it is talking with, and sends terminal-specific data to it.
Learning the VT terminal reference is another necessary step.
So, your task is to write VT terminal emulation. VAX should believe that it is talking with VT. End user may see an exact copy of the terminal or something else, like full-featured GUI application - this is less important. Finally, such tasks are usually solved by complete terminal emulation also for end user. Not surprising, this is a lot of work.
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I fixed a bunch of bugs in terms of color byte order (I had switched from RGBA to ABGR) which I hoped would fix my SVG rendering, whose colors are off. After finding and squashing a bunch of bugs (and watching the colors change accordingly) the last bug I fixed put my output clear back where I started!
So that was my morning. 
Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix
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Have a colorful day! 
"In testa che avete, Signor di Ceprano?"
-- Rigoletto
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Why you switched from 'RGBA to ABGR'?
From what I remember, 'ABGR' is really a native Windows API thing, which has even corrected with wpf.
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It's not windows. (Well, it can be, but it's embedded/cross platform)
It's based on the fact that the plutosvg library I used uses argb and rgba but LITTLE ENDIAN overall.
The thing is, since shifts are reversed for big vs little endian in C/C++ big endian RGBA = little endian ABGR
My graphics library produces big endian footprints for pixels on little endian systems. The reason for that is almost all display hardware takes its frame buffer memory in big endian format.
I'd change plutovg to use big endian pixels but I don't understand this function:
static inline uint32_t BYTE_MUL(uint32_t x, uint32_t a)
{
uint32_t t = (x & 0xff00ff) * a;
t = (t + ((t >> 8) & 0xff00ff) + 0x800080) >> 8;
t &= 0xff00ff;
x = ((x >> 8) & 0xff00ff) * a;
x = (x + ((x >> 8) & 0xff00ff) + 0x800080);
x &= 0xff00ff00;
x |= t;
return x;
}
The exception would be things like a windows PC, * but * in that case it's 1 byte per pixel, making swapping them easy, whereas byte swapping a 16-bit RGB565 pixel is less straightforward.
So since plutovg is RGBA little endian, my vector pixel format is ABGR big endian. In my library, conversions between different pixel formats is transparent so it really doesn't impact the surface area of the API.
Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix
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Got it, I think 
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Three lefts make a right.
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honey the codewitch wrote: the last bug I fixed put my output clear back where I started
Been there. Done that. 
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Hello all, does anyone here know of a reliable domain hosting company - I'm currently using Webhosting.uk.com who are proving to be unreliable ( been down twice this year for a few days )- my domain name is purely used for email purposes.
In a closed society where everybody's guilty, the only crime is getting caught. In a world of thieves, the only final sin is stupidity. - Hunter S Thompson - RIP
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For my personal sites, I’ve been using Dreambost for years. Never had an outage with them. Not sure if they’re US only though.
https://www.dreamhost.com/
Pretty sure they’re Linux only though, but since I’ll never use a Windows server if given the choice… that’s cool.
If it’s for the enterprise, that’s a whole different story. But for personal stuff they’re awesome.
Jeremy Falcon
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Oh, I used IONOS in the past too. Like 15-20 years ago.
https://www.ionos.com/
They’re a lot more corporatey and do data tracking a lot more. Which is why I stopped using them, but the service itself is ok if you don’t mind being their pawn.
Jeremy Falcon
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I use them also. I have not had any problems so far. I use them mostly for email, but I also have a starter website on the service.
I use Thunderbird as my email client; my wife uses their web email client. I am not sure what interface my children use.
__________________
Lord, grant me the serenity to accept that there are some things I just can’t keep up with, the determination to keep up with the things I must keep up with, and the wisdom to find a good RSS feed from someone who keeps up with what I’d like to, but just don’t have the damn bandwidth to handle right now.
© 2009, Rex Hammock
“If you don't have time to do it right, when will you have time to do it over?” - John Wooden
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And lastly, if it’s just DNS only (and you don’t mean website hosting) I still use GoDaddy. I’ve known peeps that worked there that were pretty smart. Unfortunately, they call it me waaaayy too much with sales crap, but I’ll still use their DNS at times. Never went down for me. But, that’s just DNS only. I refuse to host a site with them.
You’re not talking about a registrar right? But the actual DNS or website hosting?
Jeremy Falcon
modified 15hrs ago.
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All I want Jeremy is some email accounts using my pjksolutions.com domain name. I don't know what the terminology is for that. Thanks for your help
In a closed society where everybody's guilty, the only crime is getting caught. In a world of thieves, the only final sin is stupidity. - Hunter S Thompson - RIP
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Gotcha. I’ve used Dreamhost then for DNS hosting and never had a problem. They also have their own web-based email client if you don’t want to use Gmail or your own.
Hope you find a good host man.
Jeremy Falcon
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So are you saying what I need is DNS hosting ? I'm not au fait with all the Web related shite stuff. Thanks again
In a closed society where everybody's guilty, the only crime is getting caught. In a world of thieves, the only final sin is stupidity. - Hunter S Thompson - RIP
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Yuppers, a quick over simplification of what's going on... and in which order...
1 You need a registrar. Basically a frontend for a public database that says blah.com is pointing to these DNS servers, etc. For you this is tucows currently, and this has to be public info so the public can find your site. Since I doubt the problem is on this end (otherwise I couldn't do an nslookup on it) and since registrars are just a middleman, not spending too much time here.
2 You need DNS hosting with a DNS server. This is where name server entries come in. Most registrars will fill this in for you. However, in your case this is set to ns173.eukdns.com and ns172.eukdns.com. Which, when going to their site, they don't have a valid SSL cert, so I wouldn't trust them. So, anyway, your domains registered at tucows is pointing there. Maybe your webhost uses these people underneath the hood... who knows. But this could be the why your crap goes down if these people suck.
So basically, you'll need to replace eukdns.com if you have outage problems. To a better DNS server. On that DNS server you want to edit MX records in particular. These records are what allows you to configure your email client.
3 You'll need email hosting (POP3, IMAP, SMTP, etc.) for that MX record to point to. This could be another outage area. Not sure as I'm just looking into this. You can usually tell though if it's server or DNS related by doing some DNS queries or trace routes. Anyway, most places that offer email hosting will also handle number 2. So, you don't have to worry about thinking of them as separate even if they are.
Since email is so common, just about every web host offers email hosting with their service. It'll be harder to find one that doesn't. So, if you find any good web host besides the one you got, you should be good to go. Tucows is most likely still good to keep and having a registrar other than your host is a good idea in case you ever get into a dispute with your host they won't control your domain.
Hope that helps and I didn't make it worse. 
Jeremy Falcon
modified 14hrs ago.
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Thanks Jeremy - it sounds very complicated to me - if I leave my current hosting company I wiil lose my domain name and email boxes. What I want to do is, transfer the entire setup to another host. Is this doable. You say keep the registrar separate from the host but how will they bill me for renewal? Thanks again
Confused of London
In a closed society where everybody's guilty, the only crime is getting caught. In a world of thieves, the only final sin is stupidity. - Hunter S Thompson - RIP
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pkfox wrote: if I leave my current hosting company I wiil lose my domain name and email boxes. What I want to do is, transfer the entire setup to another host. Is this doable.
Yes. It sounds like your host is lying to you and are crooks or their support sucks or both. So, for the next time don't use the same peeps for your domain and host to help avoid this nonsense.
Tucows is the reigstrar for your domain, here's the proof. It seems these days that Tucows only resells, but they control the domain right now and not your web host. Given the fact they're white label, your host is just pretending to be domain registrar. I'd be messaging Tucows letting them know you want to change name servers to a new host (after you get the host that is) and your current host won't allow it. Hopefully their support won't suck.
My Domain Provider is unreachable
For your inboxes, you can recreate them on the new host. If your web host support says you can't, they're full of it. Most peeps use IMAP these days. Not sure what email client you use, but even Outlook will allow you to export and import old emails that you downloaded. Anyway, here's pretty pictures about that.
Side note, never use a reigstrar that doesn't allow you to transfer a domain. Your web host is playing registrar as a proxy to Tucows, so they should allow it. If they don't, then your web host is acting like crooks.
Jeremy Falcon
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Thanks for your patience Jeremy - to be clear
1) I don't have to move registrar
2) I need an email hosting server
3) I need their nameservers
4) I need to contact tucows and ask them to update the nameservers/ MX record for my domain name with the new ones
Question
Will tucows know how to contact me for billing purposes to renew the domain
Thanks again
In a closed society where everybody's guilty, the only crime is getting caught. In a world of thieves, the only final sin is stupidity. - Hunter S Thompson - RIP
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pkfox wrote: Thanks for your patience Jeremy
Any time, buddy.
pkfox wrote: to be clear
1) I don't have to move registrar
2) I need an email hosting server
3) I need their nameservers
4) I need to contact tucows and ask them to update the nameservers/ MX record for my domain name with the new ones
Close... and the only reason this isn't so simple is your web host...
1) I don't have to move registrar.
Normally correct. Tucows is white label, so you may have to depending on if your new host uses them or not. Normally, this is not the case, but Tucows seems to only be white label and don't deal with customers directly.
2) I need an email hosting server.
Yuppers.
3) I need their nameservers.
Yuppers.
4) I need to contact tucows and ask them to update the nameservers/MX record for my domain name with the new ones.
Close. I'm sure they'll want you to contact your web host first. But, Tucows will use the new host's name servers. So yes for that. You'll update the MX records on the new host (which the new host may do automatically). Tucows will only have control over the name server entries and since they're white label they may want you to speak to your host to change that.
pkfox wrote: Will tucows know how to contact me for billing purposes to renew the domain
Great question. I imagine they wouldn't. Since they're just a white label reseller they probably don't do that. Which means you may just have to transfer your domain elsewhere.
Most likely Tucows will tell you to speak to your web host for that transfer first (guessing they have some API to interface with them). But, if your web host refuses to allow you transfer your domain then they're breaking ICANN policy and according to Tucow's website at least, then they'll take action.
If your web host says you can't backup your emails if you transfer the domain, just know if that if you're on IMAP... they're wrong.
Jeremy Falcon
modified 11hrs 20mins ago.
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I don't want Web site hosting only email - thanks anyway
In a closed society where everybody's guilty, the only crime is getting caught. In a world of thieves, the only final sin is stupidity. - Hunter S Thompson - RIP
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They are hosting everything 
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