Search found 21 matches

by Kai
Sat Nov 30, 2019 4:19 pm
Forum: Hardware
Topic: "Mageco" disk controler. [infos, Docs wanted]
Replies: 55
Views: 8556

Re: "Mageco" disk controler. [infos, Docs wanted]

8008guy wrote:
Sun Nov 17, 2019 7:20 pm
Are the PCB layouts verified working?
I got my rebuild not fully working. It reads correctly but does not format and write. I checked it with the original again and again, no ideas anymore.
by Kai
Wed Mar 27, 2019 8:10 pm
Forum: Hardware
Topic: trying to figure out the issue with Timex Sinclair 16k RAM Pack
Replies: 3
Views: 667

Re: trying to figure out the issue with Timex Sinclair 16k RAM Pack

The most RAM packs have issues with the voltage supply and defective RAM chips. Check for correct voltages first. Then put this little circuit between the ZX and the RAM pack: rampackdoctor.JPG Now the ZX should run with its internal RAM even if the pack is faulty. If not, there is a serious problem...
by Kai
Sun Feb 17, 2019 11:01 am
Forum: Sinclair Misc
Topic: How bad was the wobble on the zx81
Replies: 19
Views: 3533

Re: How bad was the wobble on the zx81

Wow. I have absolutely no use whatsoever for a zeddy with 1MB of RAM but I really want one! :shock: Go back to 1993. Since then we have 1 MB RAM for the ZX81: http://www.fischerkai.de/zxteam/mega_e.htm And with 628512 (512kx8) RAM chips on it you'll have 4 MB. It is nice for fast animation with HRG...
by Kai
Tue Feb 05, 2019 12:11 pm
Forum: Hardware
Topic: "Mageco" disk controler. [infos, Docs wanted]
Replies: 55
Views: 8556

Re: "Mageco" disk controler. [infos, Docs wanted]

kai, you had to forget something ... it was you who installed the floppy disk 3.5 inches .. because when my floppy disk was down, the floppy disk was a 3 inches .... you had changed the floppy disk to put a 3.5 inch .. I do not know if you remember that I don't remember all the details after the ye...
by Kai
Mon Feb 04, 2019 8:46 pm
Forum: Hardware
Topic: "Mageco" disk controler. [infos, Docs wanted]
Replies: 55
Views: 8556

Re: "Mageco" disk controler. [infos, Docs wanted]

Here we go.
Schematics and layout for both PCBs.
Eagle 3.55 format and PDF.
And the ROM image too.
Feel free to check and correct!
by Kai
Sun Feb 03, 2019 8:31 pm
Forum: Hardware
Topic: "Mageco" disk controler. [infos, Docs wanted]
Replies: 55
Views: 8556

Re: "Mageco" disk controler. [infos, Docs wanted]

The mageco has two PCBs and this schematic is only the controller board.
The other has decoder logic, the EPROM and the printer IF on it.
003.JPG
mageco_if2.sch.pdf
(108.21 KiB) Downloaded 71 times
by Kai
Fri Feb 01, 2019 8:57 am
Forum: Hardware
Topic: "Mageco" disk controler. [infos, Docs wanted]
Replies: 55
Views: 8556

Re: "Mageco" disk controler. [infos, Docs wanted]

The mageco connects to shugart bus. I used a 3,5" PC floppy with it.
It has no controller or special chip, yes.
Other floppy interfaces have WD17xx controllers oder at least a MC6850 (Larken). The mageco does not and works even though. That's the most interesting thing with the mageco.
by Kai
Fri Feb 01, 2019 8:39 am
Forum: Lambda 8300/ Power 3000 Lounge
Topic: Das PC-8300 ROM Buch
Replies: 6
Views: 4022

Re: Das PC-8300 ROM Buch

The books are for download at:
ftp://www.fischerkai.de
login: pc8300
pwd: power3000
by Kai
Thu Jan 31, 2019 8:52 pm
Forum: Hardware
Topic: "Mageco" disk controler. [infos, Docs wanted]
Replies: 55
Views: 8556

Re: "Mageco" disk controler. [infos, Docs wanted]

Coming soon! Have to check that I take the correct files with the latest revision.