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by Jan-80
Sat Feb 10, 2018 3:24 pm
Forum: Beginners
Topic: Using the RasPi as a Parallel Terminal
Replies: 11
Views: 1446

Re: Using the RasPi as a Parallel Terminal

Sadly, there is no mention of a protocol anywhere, but I have to assume it was something that was used before. This sounds like a typical 'memory mapped peripheral'; .. What protocol is used in doing that is anyone's guess .. whether simplistic or complicated. You may only be interested in video bu...
by Jan-80
Fri Feb 09, 2018 9:58 pm
Forum: Beginners
Topic: Using the RasPi as a Parallel Terminal
Replies: 11
Views: 1446

Re: Using the RasPi as a Parallel Terminal

Thanks. It's cheaper than I thought.
by Jan-80
Thu Feb 08, 2018 9:38 pm
Forum: Beginners
Topic: Using the RasPi as a Parallel Terminal
Replies: 11
Views: 1446

Re: Using the RasPi as a Parallel Terminal

I heard of those.
Any pointers for this specific project?
(or do I just Google "Level shifters" ?)
by Jan-80
Wed Feb 07, 2018 10:03 pm
Forum: Beginners
Topic: Using the RasPi as a Parallel Terminal
Replies: 11
Views: 1446

Re: Using the RasPi as a Parallel Terminal

OK.
For starters. Both the the DVI as the Model 100 were 5V. But the R.Pi isn't. I'm trying the R.Pi to emulate a DVI.
How do I convert the 5V data from the Model 100's data bus to the 3.3V for the R.Pi GPIO pins ?
by Jan-80
Wed Dec 27, 2017 10:29 am
Forum: Other projects
Topic: Pi3 in a TRS-80 Model 100
Replies: 6
Views: 7236

Re: Pi3 in a TRS-80 Model 100

I hope you didn't destroy a working classic computer like the TRS-80 Model 100 to build this?
Nice work.
Why use the GPIO pins for the keyboard matrix ?
by Jan-80
Mon Aug 07, 2017 9:40 am
Forum: Beginners
Topic: Using the RasPi as a Parallel Terminal
Replies: 11
Views: 1446

Using the RasPi as a Parallel Terminal

I am an old computer user. I am 53, and I use old computers, as a collector of Tandy and TRS-80 computers. Tandy had the TRS-80 Model 100, one of the first laptops. For that machine, there existed a Disk/Video Interface that gave the '100 disk and big screen capabilities. The DVI were expensive, bul...

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