Repórter Retro 106 - Retrópolis

Este é o Repórter Retro 106, produzido pela A.R.N.O. (Agência Retropolitana de Notícias)! MP3 para ouvir offline Escute no YouTube Do que falamos? 35 anos do VESA 0 anos do Cult of the Dead Cow 40 anos do Tatung Einstein Adrian Black dá um banho de loja numa placa-mãe 286 RMC cria um Lemmings de

Retrópolis - A cidade dos clássicos

A little more fun with the #MC6847, hooking the lower part of the address bus to the device's data bus, instead of hardcoding a single value on it, so that it cycles through all the characters.

#HomebrewComputer #Electronics

Time to hook the stages up... And it works! 😅​

Going for broke, I didn't bother to impedance match or AC couple, hooking the small TV's composite port directly to the output of the amplifier stage, hooked up to the Y output of the #MC6847 I received from @ometeer

This awesome monochrome 32x16 screenful of @ signs is the first milestone of adding video to my SBC#0 project. 🤓​

#HomebrewComputer #Electronics

Need to fiddle a little with the output signal level (plus I should load it with 75Ω like a TV would) to be on spec, but something like this should be good enough for a #MC6847 test video driver.

(It's a common emitter amplifier, inverting the signal from the VDG, followed by an emitter follower for buffering.)

#electronics

Testing the #MC6847 received from @ometeer

Just reviewing the expected signal outputs at this stage. Need to do a little inverting signal amplifier before being able to drive an actual composite video input. That'll be the next step if all is good.

The #MC6847 graciously donated by @ometeer arrived over Christmas. 📦​ Hope it made the journey safely, hope to find a window to sanity check it in the test rig later tonight. 🤓​

Second attempt to source some #MC6847 ICs for my #homebrewcomputer.

Previous ones didn't behave as expected in the test rig, maybe these will...

#electronics

Oh yeah, and what are you gonna *do* about it?

#homebrewcomputer #mc6847 #electronics