Linked by Thom Holwerda on Tue 15th Jan 2013 22:29 UTC
Hardware, Embedded Systems "In this article, I show at the transistor and silicon level. I've discussed the mathematics of the 6502 overflow flag earlier and thought it would be interesting to look at the actual chip-level implementation. Even though the overflow flag is a slightly obscure feature, its circuit is simple enough that it can be explained at the silicon level."
Thread beginning with comment 549014
To view parent comment, click here.
To read all comments associated with this story, please click here.
Member since:

for example the Z80 is still sold and used in many of the CCC MP4 players sold on Chinamart, one can pick up one of those and try hacking on that.

isn'T the z80 the architecture with the most produced units?

Reply Parent Score: 2

bassbeast Member since:

It was last time I checked. See those cheap MP3/MP4 players at the checkout? Z80. Thermostats? Z80. Car Stereos and car MP3 players? Z80. Honestly they seem to use that chip more now than they did back when it was being sold in mainstream computers. Can't say as I blame 'em, easy to program for, low power, cheap, and can play most media with the right DSP attached.

Like I said go to Chinamart or any of those Asian vendor sites and you'll find TONS of units, from gumstick MP3s to game handhelds running the Z80 chip, some of them are pretty fricking awesome. I had one of the "MP4" players that ran on SD cards, it would play NES and Gameboy as well as play music and videos, got halfway decent battery life as well. I ended up giving it to a relative who had a sick kid, kept his mind off being sick all the time to have hundreds of games on an SD card. I'm really gonna have to get me another one one of these days, they are great little units.

Reply Parent Score: 2

zima Member since:

Such absolute domination of Z80 is not really the case any more - a lot of Chinese media players (especially those with more processing power requirements; like, when needed for emulation, or software decoding of various media formats) come with RockChip SoCs. And that's ARM.

I suppose in the simplest devices Z80 is still a fairly safe bet - like in S1 MP3 players:

Edited 2013-01-16 19:20 UTC

Reply Parent Score: 3