HP-48 - Mac Connectivity (2023)

[grbrum]

Hello, I was wondering if there is any "ultimate connectivity guide" for the HP 48 to connect to a modern Mac.
I've searched many cables, serial to usb, etc. but at this point it seems very much trial and error.

I am also willing to make my own cable if there is any directions out there.

thank you all.

[EugeneNine]

Does a standard USB to serial not work?

Then you follow the directions here http://www.columbia.edu/kermit/hp48.html

[Mark Power]

Not all USB to RS232 cables have the correct chipset for Mac compatibility. I use this one:

StarTech.com 1 ft. USB to RS232 Serial DB9 Adapter Cable with COM Retention - Up to 920 kpbs USB to RS232 Adapter (ICUSB232PRO) https://amzn.eu/d/bD9eh9m

Connect that to the HP48 cable. Add a USB-A to USB-C adapter if needed.

I use Kermit in a terminal (use homebrew to install Kermit) or the Hoppi app (which doesn’t have all the features of real Kermit but is fine for file transfers).

This setup works on my 2015 MbP and 2022 MbP (M1).

[HP67]

(07-18-2023 08:59 PM)EugeneNine Wrote:  Does a standard USB to serial not work?

Then you follow the directions here http://www.columbia.edu/kermit/hp48.html

The link is broken. I think Columbia killed a lot of the kermit stuff. There was an archive somewhere on Columbia, I don't have the link handy at the moment.

The situation looks grim. Even though searching for kermit on the top level columbia site does produce hits, all the links are broken.

[rprosperi]

(07-19-2023 01:40 PM)HP67 Wrote:  The link is broken. I think Columbia killed a lot of the kermit stuff. There was an archive somewhere on Columbia, I don't have the link handy at the moment.

The situation looks grim. Even though searching for kermit on the top level columbia site does produce hits, all the links are broken.

The link works fine from here (NY), no problem at all. The main site link is here, try this:

http://www.columbia.edu/kermit/index.html

All the links I tried there also worked, so it looks like you're having a local issue.

[Sylvain Cote]

For anything serial port related on macOS I am using Decisive Tactics Serial app.
The application is using its own low level serial drivers and support Prolific and FTDI serial-to-USB chips.
The application support Kermit file transfer, I just tried it, I was able to send and receive a file.
Test setup: HP-48SX + HP-48 serial cable + serial-to-USB (prolific) + Serial app running on macOS 13.4.1 Ventura (MBP 2019 Intel)
Sylvain

[HP67]

(07-19-2023 02:14 PM)rprosperi Wrote:  

(07-19-2023 01:40 PM)HP67 Wrote:  The link is broken. I think Columbia killed a lot of the kermit stuff. There was an archive somewhere on Columbia, I don't have the link handy at the moment.

The situation looks grim. Even though searching for kermit on the top level columbia site does produce hits, all the links are broken.

The link works fine from here (NY), no problem at all. The main site link is here, try this:

http://www.columbia.edu/kermit/index.html

All the links I tried there also worked, so it looks like you're having a local issue.

How interesting, I get a 404 page

[rprosperi]

(07-19-2023 04:56 PM)HP67 Wrote:  How interesting, I get a 404 page

Your profile says your in a "3rd world country" - where is that? Possibly they block access to where you are?

Do you have access to a VPN?

[Sylvain Cote]

https://... is not avaiable on this site, try http://... instead.
Unless manually specified, some browser transform a http request into a https request automatically.

[Mark Power]

With the cable I recommended, install (home)brew from https://brew.sh/

Then in the terminal do: brew install kermit

Then follow my instructions here: https://www.hpmuseum.org/forum/thread-18...#pid164309

[HP67]

(07-19-2023 05:01 PM)rprosperi Wrote:  

(07-19-2023 04:56 PM)HP67 Wrote:  How interesting, I get a 404 page

Do you have access to a VPN?

Good idea. I tried tor and I get the same 404 page for exit nodes in Germany and America. Real head-scratcher!

(07-19-2023 05:26 PM)Sylvain Cote Wrote:  https://... is not avaiable on this site, try http://... instead.
Unless manually specified, some browser transform a http request into a https request automatically.

That is true, but you don't get a 404 for that.

Anyway, it looks like it's a browser issue. Opera and Firefox land on the 404 page, if I go via Chrome, it works.

Appalling, but resolved. Sorry for the interruption, guys.

Anyway I grabbed the source long ago and built it on several platforms. It has not changed since AFAIK, so worst case, I build from the sources I archived.

[Sylvain Cote]

(07-19-2023 06:59 PM)HP67 Wrote:  

(07-19-2023 05:26 PM)Sylvain Cote Wrote:  https://... is not avaiable on this site, try http://... instead.
Unless manually specified, some browser transform a http request into a https request automatically.

That is true, but you don't get a 404 for that.

I just tried Firefox and I get a 404 because the https service is available but not for this specific page, so the 404 error.
Without doing any investigation, they seems to have two web servers, one with http and one with https, with different content for each.
Firefox refuse to use http when a https service available even though I have disable the automatic http to https conversion.

[HP67]

(07-19-2023 07:19 PM)Sylvain Cote Wrote:  

(07-19-2023 06:59 PM)HP67 Wrote:  That is true, but you don't get a 404 for that.

I just tried Firefox and I get a 404 because the https service is available but not for this specific page, so the 404 error.
Without doing any investigation, they seems to have two web servers, one with http and one with https, with different content for each.
Firefox refuse to use http when a https service available even though I have disable the automatic http to https conversion.

Interesting, thanks. That's quite the broken setup on their part. I'm a bit surprised that it also breaks for me on Opera browser. I'll have to check if it also refuses to accept http if an https listener is found at the same ip address.

[EugeneNine]

werks for me