Teensy Twofer Of Plug-In Emulated Retro CPUs
[Ted Fried] wrote in with not one particular but two (2!) new fall-in replacements for prevalent old-university CPUs: the Zilog Z80 and the Intel 8088. Both of the “chips” operate in cycle-precise manner as properly as in a super turbo method, which can operate so speedy that you’ll need to have to use the Teensy’s internal RAM just to preserve up.
Both of those of these layouts have a components and computer software component. The PCBs mainly adapt the pinout of the Teensy to the target CPU, with a bunch of 74VLC latches on board to do the voltage level conversion. The relaxation is a matter of emulating all of the instructions on the Teensy, which is additional than quickly adequate to retain up. If this seems acquainted to you, it’s essentially the same method that [Ted] applied final calendar year to bring us his replacement for the 6502 discovered in the Apple ][ and Commodore 64.
Why would you want an emulated CPU when the originals are continue to out there? [Ted] inherited a busted Osborne I, an historical Z80 luggable. By changing the initial Z80 with his emulation, he could diagnose the entire process, which led him to learn some poor DRAM chips and get the outdated beast running once again. Or perhaps you just want to play IBM XT game titles at insane speeds?
And it looks like [Ted] has up-to-date his 6502 emulation to involve the undocumented C64 opcodes, so if you’re into that scene, you should be covered as properly.
If any of this tickles your fancy, head about to [Ted]’s blog, microcore labs, and stick to together. Despite the fact that now that he’s protected most of the well known retrocomputers, we have to check with ourselves what processor is going to be following?
