8BitGuy1
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How the Commodore REU Works
🕑 Added 2022-08-04 16:56:58 +0000 UTCUpdate - I uploaded a new version that fixed the typo everyone was telling me about. For some reason with the new Patreon layout I couldn't figure out how to edit the link to the video, only the text. So I had to delete the old post.
Comments
Rick Green
I feel like it might be time to merge the channels together. Just saying
So I did see many posting the REU prices in YT comments, but I found an actual “Lycos Computer” ad from Apr ‘88 Compute’s Gazette listing the 1764 at $117 (!) and the 1750 as “call” , lol…
Paul Bruner
Talking about ram interfaces, been playing with this recently. https://github.com/cknave/c64-pico-ram-interface I had the pcb printed and it works fine and there are plenty of pico's around. It is a bit flaky as it uses DMA to move data between the C64 and the chip but still works well enough
The 8-Bit Guy
Well, I had about 5 more episodes planned out. I just don't know when I'll ever have the time to make them.
Mels Van Wees
Anything 8 bit keys planned?
Edo van Zanten
It was a nice video and for me very informal. I never knew about this memory device, and about Sonic ;) as I'm not a commodore Guy , but a MSX one ;) Thank you for some nice vid again!
I especially liked the technical coverage of the clock cycles. You mentioned blitters; I'd enjoy learning more about them in a future video.
Seán Byrne
I wish it was that simple with the Atari back then. Back in the 90s my brother bought a 256KB RAM kit for the Atari 800XL and I recall it involved him replacing several chips and soldering jumper wires. It failed to power up, so he had to send it somewhere (can't remember the place) where the fault was due to having a buggy 'B' revision of BASIC. They replaced BASIC chip with a revision 'C' and sent it back to us. With this RAM upgrade and also the Atari 130XE (with 128KB) it was possible to access the expanded RAM in 16KB bank blocks (32KB-48KB address range if I recall right) with a poke command. The only software I can recall utilising the extra RAM was some digital audio sound player and a RAM disk, but can't remember any software title.
So kind of like a modern day SSD?
Big Car
On your main page click the "..." button on the right hand side and select "Manage Posts". Select the post you want and hit the "Edit" button. You'll see the video at the top of the screen. There's a hidden trash icon top right on the video (very hard to see). Click that and you can add the new video. I just had to do this and discovered it by accident!
Robert Bontrager
Thank you David for another great video!!! I had no idea the REU existed.
Rick Green
It's impressive how the C64 version of Sonic actually runs better than the original Master System/ Game Gear version. It's easily possible for Sonic to outrun the screen on the Master System, but the Commodores can keep up with the Hedgehog.
