"Hobby", a Z80 Computer Prototype compatible with CP/M & Sinclair ZX Spectrum Operating Systems

[erwin8971]

Dude fucking awesome

[VladMaster99]

z80...2114 Ram..2764 Eprom 4116 Dynamic Rams.

Added 41256 Rams and bankswitching later.

had also a 6809P as well

[richardmaudsley77]

how could you say this was cutting edge in 1987?

The amiga, atari st, Acorn archemedes, etc... Your computer is more like 1977 tech.

But it's cool though. CP/M is awesome.

[lordtapdoles]

This is REALLY, REALLY amazing. Well done! Especially aged 18 in 1987, without proper access to ICs - absolutely amazing.

[VintageJunior]

I didn't know the Speccy's OS worked on other Z80s.

[anticioroi]

Stima, respect si consideratie!!

[mentalthink]

this is awesome, thanks for the video, this is a grat beast.

A question, where you found information, books or another format, for can make a 8 bits computer.

Thanks,

[RoGeorgeRoGeorge]

@mentalthink

From written books, databooks, the sources from a Spectrum EEPROM and a CP/M listing with source codes.

[lich0x2b]

Maestre, tot respectul!

[nuclearthelab]

Awesome :) A friend of mine that came from the soviet union had a 48k spectrum clone back then, and we used to write spectrum programs together (I had the original 128k +2). I remember that machine of his being really ugly, but it worked flawlessly :)

It's good to find someone who actually created those beasts :)

[Manare71]

Try "La Abadía del Crimen", that's a difficult one which throwed many compatibility issues.

[timecircuitsbuilder]

You made a fantastic work !!! I have the same project but I don't know how to find the operating system for my project. Where did you find your OS CP/M ? Thanks.

[RoGeorgeRoGeorge]

Merci beaucoup. J'ai vu votre laboratoire et je suis enchante de votre time circuits aussi!

CP/M is made by 3 components called CCP, BDOS and BIOS. To adapt CP/M to my computer I made a copy of the OS from the Felix M118 computer then stripped away the BIOS and completly rewrite it in Z80 assembler. This takes me A LOT of time. Later I found the source codes for the whole CP/M and i think i still have them somewere on the old 5'' floppy disks.

[timecircuitsbuilder]

Thank you very much ! The CP/M is still too difficult for me, I prefer to start to build a replica of the Apple I and I will use the monitor program of Steve Wozniak.

[zxspectrum128]

I admire what was done by you and others in countries where the Spectrum wasn't available. It's a shame that the last Spectrum users from those countries don't become more active in places like WOS, and don't try to have their work translated to English.

How compatible with the Spectrum was this computer of yours?

[RoGeorgeRoGeorge]

Thank you for your appreciation. It might be some uncompatible programs out there but i don't remember any game or utility that works on Sinclair ZX Spectrum and doesn't work on Hobby. If you know any program that usually works only on the original ZX Spectrum please let me know and i'll give it a try becouse i am curious to see the results too.

[adicontakt]

pretty , isn"t so?