UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Computers

Notices

Vintage Computers Any vintage computer systems, calculators, video games etc., but with an emphasis on 1980s and earlier equipment.

Reply
 
Thread Tools
Old 28th Mar 2021, 8:50 pm   #21
audiokit
Triode
 
Join Date: Jan 2021
Location: Hulst, Netherlands.
Posts: 17
Default Re: INS8073 - What I wanted, but never got.

Hello Wally.

I am surely interested too. Impossible to buy one until now. I did experiment a lot with its older brother INS8060 (SC/MP) but surely want to make a single board computer with this one. Would you consider shipping one of those to the Netherlands too?
audiokit is offline   Reply With Quote
Old 15th Apr 2021, 3:24 pm   #22
wallaceowen
Diode
 
Join Date: Mar 2021
Location: San Diego, California, USA.
Posts: 2
Default Re: INS8073 - What I wanted, but never got.

I posted the four INS8073 chips to Buzby123, so they're all on your side of the Atlantic now, and he said he'd share them with others. He covered the p/p and customs fees.

Quote:
Originally Posted by Timbucus View Post
Hello Wally from San Diego - welcome to the forum - you may wish to keep one, this forum seems to have an effect on people who were getting rid of something...

Well being an avid follower of all these things I would love to get one of them! Maybe if there are a few UK requests we could simplify your life and post on from a central point.
wallaceowen is offline   Reply With Quote
Old 15th Apr 2021, 7:26 pm   #23
Timbucus
Octode
 
Join Date: Mar 2019
Location: Barry, Vale of Glamorgan, Wales, UK.
Posts: 1,094
Default Re: INS8073 - What I wanted, but never got.

Quote:
Originally Posted by audiokit View Post
Hello Wally.

I am surely interested too. Impossible to buy one until now. I did experiment a lot with its older brother INS8060 (SC/MP) but surely want to make a single board computer with this one. Would you consider shipping one of those to the Netherlands too?
There are lots of SC/MP enthusiasts and projects on this board so welcome! I am sure Buzby123 will be in contact with you - as you are a new user until you have a few posts you may find delays as you await approval and i think PM's are restricted as well. Maybe you could outline what you fancy building with this chip...
Timbucus is offline   Reply With Quote
Old 19th Apr 2021, 6:29 pm   #24
audiokit
Triode
 
Join Date: Jan 2021
Location: Hulst, Netherlands.
Posts: 17
Default Re: INS8073 - What I wanted, but never got.

Hello Tim, Jeff was so kind to send me one so when it arrives I will see how I can make it to a nice SBC with terminal access. Of course all in wire wrap, best technique if your plans are not sure yet. I will keep you informed.
audiokit is offline   Reply With Quote
Old 19th Apr 2021, 7:07 pm   #25
Timbucus
Octode
 
Join Date: Mar 2019
Location: Barry, Vale of Glamorgan, Wales, UK.
Posts: 1,094
Default Re: INS8073 - What I wanted, but never got.

For those following along I intend to build this single board computer....

https://www.facebook.com/groups/1233...9238310451124/

based on one in a French magazine linked from the above post.
Timbucus is offline   Reply With Quote
Old 20th Apr 2021, 4:58 am   #26
Mark1960
Heptode
 
Join Date: Mar 2020
Location: Kitchener, Ontario, Canada
Posts: 674
Default Re: INS8073 - What I wanted, but never got.

Could we get a direct link that doesn’t require facebook please?
Mark1960 is online now   Reply With Quote
Old 20th Apr 2021, 7:00 am   #27
SiriusHardware
Dekatron
 
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 7,315
Default Re: INS8073 - What I wanted, but never got.

I also don't 'do' Social Media at all but I'm resigned to the fact that I am one of the odd people out, so if something's only viewable on Facebook I just won't see it.
SiriusHardware is online now   Reply With Quote
Old 20th Apr 2021, 7:31 am   #28
Timbucus
Octode
 
Join Date: Mar 2019
Location: Barry, Vale of Glamorgan, Wales, UK.
Posts: 1,094
Default Re: INS8073 - What I wanted, but never got.

Apologies - Only just realised it was a closed group anyway so you can't see it without joining the actual group - sometimes public groups you can see without joining FB...

Anyway it links to this site: https://www.hb9afo.ch if you go to Articles and look down to 1982 there is Micro-Von in Megahertz magazine.

On the group George Rudolf Mezzomo has created a free to use for non profit modern SBC adaption. here is a photo - I hope to get a small number made if anyone is interested in an at cost one.

The PDF is one I found somewhere for an alternate I cannot find the source.

ins8073_board-schematic-1982.pdfClick image for larger version

Name:	20_n.jpg
Views:	40
Size:	99.4 KB
ID:	232199
Timbucus is offline   Reply With Quote
Old 20th Apr 2021, 12:16 pm   #29
SiriusHardware
Dekatron
 
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 7,315
Default Re: INS8073 - What I wanted, but never got.

Thanks Tim - I will be an interested observer only on this one, I'm really going to have to start running away from microprocessor projects rather than running towards them otherwise I'll get nothing else done. I'll live vicariously through you instead.
SiriusHardware is online now   Reply With Quote
Old 21st Apr 2021, 10:21 am   #30
Buzby123
Hexode
 
Buzby123's Avatar
 
Join Date: Oct 2011
Location: Culcheth, Cheshire, UK.
Posts: 336
Default Re: INS8073 - What I wanted, but never got.

Hi Tim,

Has your 8073 arrived yet ?.

Regarding the build, when I get back going again I don't think I'll use that PCB you posted. I want to include an 8255 or similar to give some I/O. It will be good excuse to brush up on my PCB design skills !

Cheers,

Buzby
Buzby123 is online now   Reply With Quote
Old 21st Apr 2021, 7:29 pm   #31
Timbucus
Octode
 
Join Date: Mar 2019
Location: Barry, Vale of Glamorgan, Wales, UK.
Posts: 1,094
Default Re: INS8073 - What I wanted, but never got.

Buzby,

Yes indeed it has arrive safe and sound - thank you for sorting that and for Mr Wallace providing them - it has joined the project queue of jobs which seems to get longer each day.

Tim
Timbucus is offline   Reply With Quote
Old 21st Apr 2021, 8:22 pm   #32
Mark1960
Heptode
 
Join Date: Mar 2020
Location: Kitchener, Ontario, Canada
Posts: 674
Default Re: INS8073 - What I wanted, but never got.

There isn’t much that needs to be connected to get a basic system running.

I created a component in eagle 7.6 if its any use to anyone, but so far only assembled with 8154 using point to point wiring and zif connectors. Eagle 7.6 was prior to requiring registration so I haven’t upgraded.

I was wondering if these might work well with multiprocessor, mk14 vdu, or ortonview, as they don’t access bus for internal rom and ram cycles, but I’m still busy and trying to get a digital cassette interface working.
Mark1960 is online now   Reply With Quote
Old 27th Apr 2021, 5:08 pm   #33
audiokit
Triode
 
Join Date: Jan 2021
Location: Hulst, Netherlands.
Posts: 17
Default Re: INS8073 - What I wanted, but never got.

Last week I received one of the INS8073 micorprocessors, kindly shared by Wally (thank you again) I picked my schematic today, it was illustrated in the Dutch magazine Radio Bulletin of July 1984.
If people want a translation, please let me know and I will make one. It is a very simple schematic and I want to start with the proposed 2K static RAM, using the 6116. I will expand to 64K when all works well. The board will be made in wire wrap and the connection to terminal will be simplified, hoping it will work the same way the SC/MP is communicating (SENSEB - FL0)
Attached Thumbnails
Click image for larger version

Name:	INS8073_schematic.jpg
Views:	48
Size:	71.3 KB
ID:	232772  

Last edited by audiokit; 27th Apr 2021 at 5:29 pm.
audiokit is offline   Reply With Quote
Old 27th Apr 2021, 5:45 pm   #34
Buzby123
Hexode
 
Buzby123's Avatar
 
Join Date: Oct 2011
Location: Culcheth, Cheshire, UK.
Posts: 336
Default Re: INS8073 - What I wanted, but never got.

That is a simple circuit !.

Does the article explain why there are pullups on only some of the data lines ?
Buzby123 is online now   Reply With Quote
Old 27th Apr 2021, 5:57 pm   #35
audiokit
Triode
 
Join Date: Jan 2021
Location: Hulst, Netherlands.
Posts: 17
Default Re: INS8073 - What I wanted, but never got.

D1, D2 and D7 should be pulled high to select 110 Baud. I will experiment with this as the schematic was made with a slow terminal in mind.
The datasheet page 3 says: "Note from the above table that if only the 110 baud rate is required, pullup resistors on data lines D1, D2 and D7 represent the only external hardware required to select this baud rate."
In our NIBL programs for INS8060 we could change the timing constants by changing some addresses in the start of the programm (on the EPROM). As this NIBL is in ROM, baudrate has to be chosen by external hardware.

Last edited by audiokit; 27th Apr 2021 at 6:14 pm.
audiokit is offline   Reply With Quote
Old 27th Apr 2021, 10:15 pm   #36
Timbucus
Octode
 
Join Date: Mar 2019
Location: Barry, Vale of Glamorgan, Wales, UK.
Posts: 1,094
Default Re: INS8073 - What I wanted, but never got.

The serial interface could be simplified if you do not want to use a current loop and just hook up a TTL to USB serial connector.
Timbucus is offline   Reply With Quote
Old 27th Apr 2021, 11:11 pm   #37
Mark1960
Heptode
 
Join Date: Mar 2020
Location: Kitchener, Ontario, Canada
Posts: 674
Default Re: INS8073 - What I wanted, but never got.

Remember that the usb to ttl converters don’t always (almost never) support 110 baud.

As you have an ‘138 for address decoding you could add a couple of diodes to pull the data lines to select 4800 baud. You might need to swap the address and enable lines on the ‘138 to allow decoding for both ram and the baud rate selection.
Mark1960 is online now   Reply With Quote
Old 27th Apr 2021, 11:16 pm   #38
Mark1960
Heptode
 
Join Date: Mar 2020
Location: Kitchener, Ontario, Canada
Posts: 674
Default Re: INS8073 - What I wanted, but never got.

Also you don’t need the ‘14 for the clock, just use the internal oscillator. The 8070 spec gives the schematic and component values, though I’m not sure if your 8073 has the earlier or later resistor required.
Mark1960 is online now   Reply With Quote
Old 28th Apr 2021, 7:57 pm   #39
audiokit
Triode
 
Join Date: Jan 2021
Location: Hulst, Netherlands.
Posts: 17
Default Re: INS8073 - What I wanted, but never got.

Thank you all for the extra information. I want to keep the schematic as simple as possible. The strength of this device is it's autonomy so I want to use it
how it was meant to be used.
Pulling up only D7 should give me a baudrate of 4800 and I think most USB to TTL converters can cope with that. In worst case I use a real RS232 circuit using the max232 and some capacitors.
audiokit is offline   Reply With Quote
Old 28th Apr 2021, 10:05 pm   #40
Mark1960
Heptode
 
Join Date: Mar 2020
Location: Kitchener, Ontario, Canada
Posts: 674
Default Re: INS8073 - What I wanted, but never got.

D1 and D2 might need to be pulled down and not just left floating, but I guess you could try without the pull ups and see what happens.
Mark1960 is online now   Reply With Quote
Reply

Thread Tools



All times are GMT. The time now is 4:29 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Copyright ©2002 - 2021, Paul Stenning.