Amiga BRAKE! - The Poor Persons Action Replay? and How Can I Improve It?

[@sacredbanana]

You triggered my level 7 interrupt when I saw this in my subscription feed

[@RobSmithDev]

😂😂 thanks for watching

[@Jaw0lf]

Another amazing investigation into how it works! Nice job

[@RobSmithDev]

Thanks

[@wimwiddershins]

Just the kind of shenanigans I like. Great stuff mate 👍

[@Lyvarious]

I do not know why KZbin recommended this video but I'm happy that it did.

[@RobSmithDev]

:) we all have to trust that the ‘magic’ algorithm knows what it’s doing - glad you liked it

[@phillupson8561]

Maaaaaaaaaan I'd forgotten about super twintris, my mum and I spent so much time playing that against each other when I was a kid, good times!

[@more.power.]

Hi Rob I have learnt so much from your video's they are great. Cheers

[@RobSmithDev]

Thank you

[@ColdRFusion]

I wouldn't have exposed wiring directy from the CPU outside the case, some sort of housing would be good for the resister & switch.

[@RobSmithDev]

It’s only a temporary mod - it’s not like I’ll leave it connected - if I was I’d build a case for it

[@gbraadnl]

7:00 Circuitbending... 9:00 however this does not change the clock-frequency... interesting yeah.

[@jjdigitalvideosolutionsllc5343]

This is something that my brother & I could have used back in the day for Test Drive. We wanted to build a steering wheel, instead of using the joystick. We didn't know anything about electronics or have access to the resources to learn anything. But we thought if there was a way to make turning the wheel left or right pulse the left/right joystick input at a variable rate, it might achieve what we wanted. A small turn would result in short pulses and the full turn of the wheel would be like holding the joystick left/right. We made a steering wheel, gas/break pedals, and a makeshift shifter. It just didn't work as well as we hoped.

[@RobSmithDev]

I looked into that type of circuit after and it’s actually quite a common approach although I’d never seen it before. When I was younger made a steering wheel for lotus although it was very basic and used a home made tilt switch to detect the rotation (was literally a marble wrapped in tin foil moving around in a cardboard tube) kinda worked but not as good as your idea

[@claudiurus7307]

Cool and simple. I never own an Atari nor a Amiga. Seeing so many videos about them I almost convinced myself to buy one but then I have realized that for me its a train that left the station. Anyway nice video!

[@RobSmithDev]

Thanks for watching. Emulation is probably your best option these days if you did want to try it out.

[@bjarkeistruppedersen8213]

So it is just PWM'ing the halt pin - that's a neat trick 😃

[@RobSmithDev]

Sure is, very simple!

[@mrkitty777]

But not Agnus, but the official Action Replay also controls Agnus

[@RobSmithDev]

There’s a deep dive into the Action Replay here - they both trigger using a Level 7 Interrupt, and the rest, we’ll take a read jvaltane.kapsi.fi/amiga/howtocode/actionreplay.html

[@moshly64]

You can do the same thing on the C64 or any 6502 by applying the same signal to the RDY pin (wait state input). There was a cart that had a 555 timer PWM circuit.

[@RobSmithDev]

Cool!

[@capnzilog]

I'd love to see a "how does the Action Replay work?" video!

[@RobSmithDev]

There’s an excellent write up here: jvaltane.kapsi.fi/amiga/howtocode/actionreplay.html

[@Geordie-Jedi-77]

Yet another cracking video Rob, keep 'em coming mate. On a totally unrelated note, can you please tell me - 1. What are the names of the music tracks you used in this video ? 2. Have you / are you planning to appear on TWIR (This Week In Retro) podcast ?

[@RobSmithDev]

All of the tracks I use are listed in the video description. Two are from the KZbin music library, the others are from here: incompetech.com/music/royalty-free/music.html

[@RobSmithDev]

And TWIR? I think someone has to suggest me to them for that to happen

[@Geordie-Jedi-77]

@@RobSmithDev Thanks Rob, sorry I missed the show notes - Doh. I'll see if I can make the suggestion to the guys at TWIR (Hope I don't need to be a fully fledged Patreon to make the odd suggestion).

[@RavenWolfRetroTech]

I like seeing projects like this that could have been done back in the day. I love my RGB2HDMI but it just has a little too much pie!

[@RobSmithDev]

This is actually really old! I think it was probably sold about 20 years ago

[@Jdbye]

Thought it would just be hijacking the clock signal, like how the GBAccelerator works. But this is kinda more interesting. And perhaps more reliable, as hijacking the clock signal could lead to a desync between the CPU and other components.

[@RobSmithDev]

Indeed and it’s probably why the rest of the hardware behaved so well with it too. I was expecting it to be messing with the clock signal too

[@skeleton_craftGaming]

Yes, but this also leads to crashes if you turn her up too high.

[@kikencorp]

what kind of gotek is that in your A500?

[@RobSmithDev]

That’s the GoDrive from digitalretrobay.co.uk

[@kikencorp]

@@RobSmithDev thanks! looks good

[@Wassermelonenbaum]

Madman. No further comment.

[@MartinS-es6dp]

To freeze realy it takes low state trougth a pull up resistor to 17 leg of cpu.

[@RobSmithDev]

That’s what the video says yes

[@TheLemminkainen]

Bremse 👍🏻

[@RobSmithDev]

Yes I suppose it should be that word