HP 86 Questions



#2

I know a few of you have the HP86 out there so I hope someone can help out.

I have come across an HP86, but it does not have a monitor. What can these things plug into? Any standard monitor or TV or what?

Also, what do you think is a fair price to offer for this. This is in a garage sale and the lady really does not know what it's worth. I don't want to take advantage of her and would like to offer a fair price.

The other thing I don't know is if this thing really even works. When we turned it on, the power light came on, but that is all I know at this point.


#3

Hi,

Use any old video composite monitor (60Hz refresh, 15Khz bandwidth).
The HP monitor is in fact a Zenith one (same look).

I have more infos at home.

Olivier


#4

So it has a yellow RCA jack on the back of the unit? I didn't check the unit out well enough. So I should be able to connect it to a modern TV then?


#5

I don't think you can connect it to a TV. It's not the right impedance ( 75 Ohm, or High) and the scan rate isn't the same.

Olivier


#6

The scan rate IS the same as NTSC video. (Maybe not exact, but close enough.)

#7

There is an RCA phono socket on the back of the 86 above the HPIB connector. It's not yellow (that convention came in much later), but it is normal RS170-like composite video that you should be able to feed into the composite input (not RF, of course) of a US TV. At least in the 86B (the model with 128K RAM) the video output buffer is designed to drive a 75 Ohm load (that's clear from the schematic) and I have no reason to doubt that also applies to the 86.

I doubt that the 86's video output meets broadcast video standards, but it's close enough to work with all the composite monitors I have.

When you switch on you'll have a fairly long wait (even longer on an 86B) while it checks memory, etc. Then you get a cursor at the top left corner, and can start typing BASIC.

#8

Quote:
The HP monitor is in fact a Zenith one (same look).

Sure about that? I have one sitting next to an NEC from the same era, and they look identical other than the logo. Or perhaps Zenith OEM'd the NEC monitor as well?

#9

The monitor which I got with my 86Bs is certainly an NEC chassis. They may have used Zenith monitors as well, of course (FWIW, the monitor in the original IBM PortablePC luggable is a Zenith).

#10

You can even connect it to your PC monitor if your computer has a video card with composite input. See eBay auction 5110814933.


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