INS8073 - What I wanted, but never got. - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

audiokit · 28th Mar 2021, 8:50 pm

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?

wallaceowen · 15th Apr 2021, 3:24 pm

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

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.

Timbucus · 15th Apr 2021, 7:26 pm

Quote:

Originally Posted by audiokit

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...

audiokit · 19th Apr 2021, 6:29 pm

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.

Timbucus · 19th Apr 2021, 7:07 pm

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.

Mark1960 · 20th Apr 2021, 4:58 am

Could we get a direct link that doesn’t require facebook please?

SiriusHardware · 20th Apr 2021, 7:00 am

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.

Timbucus · 20th Apr 2021, 7:31 am

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.pdf

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SiriusHardware · 20th Apr 2021, 12:16 pm

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.

Buzby123 · 21st Apr 2021, 10:21 am

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

Timbucus · 21st Apr 2021, 7:29 pm

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

Mark1960 · 21st Apr 2021, 8:22 pm

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.

audiokit · 27th Apr 2021, 5:08 pm

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)

Buzby123 · 27th Apr 2021, 5:45 pm

That is a simple circuit !.

Does the article explain why there are pullups on only some of the data lines ?

audiokit · 27th Apr 2021, 5:57 pm

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.

Timbucus · 27th Apr 2021, 10:15 pm

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.

Mark1960 · 27th Apr 2021, 11:11 pm

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 · 27th Apr 2021, 11:16 pm

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.

audiokit · 28th Apr 2021, 7:57 pm

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.

Mark1960 · 28th Apr 2021, 10:05 pm

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.

28th Mar 2021, 8:50 pm	#21
audiokit Triode Join Date: Jan 2021 Location: Hulst, Netherlands. Posts: 25	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?

19th Apr 2021, 6:29 pm	#24
audiokit Triode Join Date: Jan 2021 Location: Hulst, Netherlands. Posts: 25	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.

19th Apr 2021, 7:07 pm	#25
Timbucus Octode Join Date: Mar 2019 Location: Barry, Vale of Glamorgan, Wales, UK. Posts: 1,159	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.

20th Apr 2021, 4:58 am	#26
Mark1960 Heptode Join Date: Mar 2020 Location: Kitchener, Ontario, Canada Posts: 776	Re: INS8073 - What I wanted, but never got. Could we get a direct link that doesn’t require facebook please?

20th Apr 2021, 7:00 am	#27
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 8,238	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.

20th Apr 2021, 7:31 am	#28
Timbucus Octode Join Date: Mar 2019 Location: Barry, Vale of Glamorgan, Wales, UK. Posts: 1,159	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.pdf

20th Apr 2021, 12:16 pm	#29
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 8,238	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.

21st Apr 2021, 10:21 am	#30
Buzby123 Hexode Join Date: Oct 2011 Location: Culcheth, Cheshire, UK. Posts: 382	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

21st Apr 2021, 7:29 pm	#31
Timbucus Octode Join Date: Mar 2019 Location: Barry, Vale of Glamorgan, Wales, UK. Posts: 1,159	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

21st Apr 2021, 8:22 pm	#32
Mark1960 Heptode Join Date: Mar 2020 Location: Kitchener, Ontario, Canada Posts: 776	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.

27th Apr 2021, 5:08 pm	#33
audiokit Triode Join Date: Jan 2021 Location: Hulst, Netherlands. Posts: 25	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 Last edited by audiokit; 27th Apr 2021 at 5:29 pm.

27th Apr 2021, 5:45 pm	#34
Buzby123 Hexode Join Date: Oct 2011 Location: Culcheth, Cheshire, UK. Posts: 382	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 ?

27th Apr 2021, 5:57 pm	#35
audiokit Triode Join Date: Jan 2021 Location: Hulst, Netherlands. Posts: 25	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.

27th Apr 2021, 10:15 pm	#36
Timbucus Octode Join Date: Mar 2019 Location: Barry, Vale of Glamorgan, Wales, UK. Posts: 1,159	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.

27th Apr 2021, 11:11 pm	#37
Mark1960 Heptode Join Date: Mar 2020 Location: Kitchener, Ontario, Canada Posts: 776	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.

27th Apr 2021, 11:16 pm	#38
Mark1960 Heptode Join Date: Mar 2020 Location: Kitchener, Ontario, Canada Posts: 776	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.

28th Apr 2021, 7:57 pm	#39
audiokit Triode Join Date: Jan 2021 Location: Hulst, Netherlands. Posts: 25	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.

28th Apr 2021, 10:05 pm	#40
Mark1960 Heptode Join Date: Mar 2020 Location: Kitchener, Ontario, Canada Posts: 776	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.