I just picked up a Zenith. Anything I should know about restoring it ?
Zdf-1217-dy

Nice! This is a XT, right? Are these the sellers photos? Would like to see the cards that are inside...

Predator99 wrote on 2020-03-02, 14:57:

Nice! This is a XT, right? Are these the sellers photos? Would like to see the cards that are inside...

Yes, those are the sellers photos. I have not received it yet. Actually I thought it was a z200 but it is a z/100
With an 8088 CPU. Which is actually what I want is an 8088 CPU because I already have a 286 computer.
This computer can run at 4.77mhz or 8mhz.

Here is a video like it.
https://youtu.be/joCbEUO0nBg

Yes, XT. Be careful with these junky IC sockets. I once had this XT say parity error at random. Wrote all the error addresses on the paper and made a chart that would cluster around one address line and looked for it using a schematic and found 2 causes, One TTL IC had bent under pin just touching the damaged socket contact. Fixed both, pry off the socket and unbend just a little and carefully insert and press the plastic socket back on.

In the end very reliable XT.

You can use a standard MFM drive set up or XT IDE. Use Segate XT/AT hard drive of 40MB, 3.5" 1" height.

Cheers,

Here's the boards in my British Telecom Z-159

And a video

https://youtu.be/YqNzs9hgl0o

Predator99 wrote on 2020-03-02, 14:57:

Nice! This is a XT, right? Are these the sellers photos? Would like to see the cards that are inside...

I just took a quick look at it. It has a hard-drive, not sure what size.
A Heath/Zenith CGA/EGA video card. Color I think ?
Memory upgrade card. Not sure how much ram. Maybe 198kb.
8-bit Hard-drive controller.
CPU board AMD 8088/8087 , Dual CPU and Dual speed ( 4.77 and 8mhz )
5.25 floppy drive.

I am not very familiar with these computers.
I have not had a chance to work on it yet as I am busy on other stuff at the moment.
When I get a chance I will take some photos of the cards.

Also interesting XT! Need to take a clother look at your video. But I see you disassembled the PSU the same level I did...looked to complicated to take totally apart.

In the mean time I got a 20MB image file from my ST-251. I recovered the structure with GetDataBack. But there is nothing too intresting on it. Maybe the Logitech Mouse driver disk, but there should be plenty copies around...

Because of the scratching sound all the time I opened it once again. Ups, looks as expected. Lots of dusts scratched of from the disks and another loose part. Cleaned with a vaccum cleaner and closed again. This disc will never store data reliably again, but I am happy to got some data off it anyway....

i have zenith 286 ICV-2521E
3.5" 1.44 floppy
1mb ram
no hdd ( installed cf card with dos 6.22)

if anyone need bios files i can upload somewhere
bios pass keep in 93c46 eeprom under cpu dougterboard (remove it and fill FFFF it will null pass for access MFM 2.0)