Trolls and Dropbox?

[Batalov]

Originally Posted by xilman

4K? Luxury! Now we had it tough...

I've written code in 2k ROM and (almost) all the RAM internal to a Z80 cpu. Even I didn't stoop as low as to use the DRAM refresh counter as RAM, though I know someone who did. Knowing how and what to put into it so as to get the right value out again in the fullness of time is seriously deep magic.

I've written tons of code in 2k ROM and (almost) all the RAM internal to a Z80 cpu, too!
Part of it was actually a discrete Fourier transform (or rather a Goertzel on the fly) - to determine a caller's number over the 2-frequency encoded sound signal. Not the same as the USA Dual-tone multi-frequency signaling, the Russian system was based on odd multiples of 100Hz (700, 900, 1100, 1300, 1500, 1700, iirc) so by sampling two-three 10ms segments of that signal you would get the same result, because of their gcd of 100Hz. The rest was a slew of service functions - save the numbers in stack, have a notebook of numbers, and even a voice read out of these numbers... oh fun fun...
https://ru.wikipedia.org/wiki/%D0%90%D0%9E%D0%9D

Listen to this - the sound of 123-45-67

[xilman]

Originally Posted by Batalov

I've written tons of code in 2k ROM and (almost) all the RAM internal to a Z80 cpu, too!

But did you have any RAM other than the Z80 registers? Apologies if it wasn't clear that my system had no external RAM at all.

[jasong]

Reading about optimizing code makes me wonder how the OGR(Optimal Golomb Ruler) project is doing. I've heard those guys are wizards at keeping stuff in L1 cache.

[LaurV]

We still deal with 8k and 16k Flash and 512 bytes to few kb RAM on daily bases, this is how we make our bread (we are STM microcontrollers and Cortex M "expert"). For more than 15 years, the "largest" toy we programmed had 1MB Flash. You may wonder to exhaustion if you knew how many things one can do in such restricted space...