Qooper on 7/10/2022 at 18:15
Do you remember those awesome personal computers from the 80s and 90s? Commodore 64, Amiga and why not MSX as well. The thing that made them so magical to me was that they came with a manual along with a datasheet and circuit diagrams that explained how they and their chips work and how you can program them. Today's PCs aren't really that personal. If you buy an Asus or HP computer, all you get is a slim manual that has Windows quick start instructions.
Well, there's the Raspberry Pi for sure, and that thing is awesome, especially the 400, which is a keyboard with a RPi4 SoC inside, so very reminiscent of those personal computers of old. But, the GPU isn't exactly open or documented. At least I haven't been able to find documentation for the hardware interface and what all the registers do etc. However, there is a Vulkan driver that one can read through to see how the GPU MMIO works, so not bad.
Then we have certain Intel chips that come with an iGPU, and those things are fully (
https://01.org/linuxgraphics/documentation/hardware-specification-prms) documented. So I've been toying with the idea of buying a cheap Intel NUC and learning how to write a simple OS for it. First just getting it to boot. Then like switch to VGA mode and draw pixels on the screen. And eventually draw a hardware accelerated triangle.
Any toy OS experience among TTLG, or love for personal PC-computers?
Al_B on 10/10/2022 at 18:31
Was also a fan of the personal computers in the late early 80s - the Apple II and the ZX81 were the ones that got me into programming and indirectly led to my career in engineering.
Years ago I wrote a (very simple) OS for the PC platform from the ground up. Learning about protected mode memory management, drive controllers, filesystem handling, network cards etc. was extremely educational. Certainly encourage you to find a platform that has hardware documentation and getting even something basic working, particularly if you can repurpose the hardware for other uses if / when you move on.
lowenz on 11/10/2022 at 16:00
Quote Posted by Al_B
if you can repurpose the hardware for other uses if / when you move on.
Self destruction ? :D
Al_B on 11/10/2022 at 20:38
Not quite what I was meaning, hopefully any experiments are not fatal :D
SubvertizingOrg on 24/11/2022 at 13:01
:D
SubvertizingOrg on 24/11/2022 at 13:03
My computer is VERY VERY personal. Anyone who lives around me knows EXACTLY that. :D
