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

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Old 1st May 2021, 1:34 pm   #41
audiokit
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Default Re: INS8073 - What I wanted, but never got.

All Components are mounted, the wire wrapping can start. I populated the sockets just to show how it will look and of course I will take the IC's out when wiring the back. This is the schematic that I showed in my first post (Radio Bulletin). Perhaps I don't need the 4Mhz Crystal but in the middle I reserved a socket to push it in, should I need (or want) it.
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Last edited by audiokit; 1st May 2021 at 1:47 pm.
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Old 1st May 2021, 3:07 pm   #42
Timbucus
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Default Re: INS8073 - What I wanted, but never got.

Wow fast progress - I like the idea of doing it with a wirewrap - I have one 40 pin socket so may explore doing the same.
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Old 1st May 2021, 3:36 pm   #43
ortek_service
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Default Re: INS8073 - What I wanted, but never got.

Yes, Wirewrap was quite common in the days of Eurocard prototyping, these separate square pads boards being designed for it, and I still often used to type with contnous ground plane grid on the top.
Quite reminiscent of the original NS PMOS ISP-8A/500 (SC/MP-I) Introkit Keyboard + Display interface teleprinter-alternative, where this kit came with instructions on how to assemble it with wire-wrapping.

Quite novel to put all the passives on headers, in case they altering.
I've always fitted these with leads adjacent to where they connected, and bent lead onto adjacent pad, but not as neat and makes changing things more difficult.
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Old 2nd May 2021, 4:57 pm   #44
audiokit
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Default Re: INS8073 - What I wanted, but never got.

From this afternoon, the INS8073 is alive!

I will post the final schematic.
I could not get the clock pulsing from the schematic that was drawn in my first post. After modification with the same clock I used for the INS8060, all worked fine. This means I only need one inverter from the 74LS14 (TTY after F1)
Mark you were right about the D1, D2, I had to pull them to ground to get 4800 baud at start up.
Tiny basic is a bit different from NIBBLE so I have to find my way programming it but all seem to work as described in the manual.
I enclose some pictures so you can see the result of my weekend's work.
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Last edited by audiokit; 2nd May 2021 at 5:06 pm.
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Old 2nd May 2021, 6:46 pm   #45
Timbucus
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Default Re: INS8073 - What I wanted, but never got.

Well done and so neatly constructed it goes well with a device from then. I had not really looked at the BASIC I just assumed it was the same as NIBL!
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Old 2nd May 2021, 7:13 pm   #46
Buzby123
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Default Re: INS8073 - What I wanted, but never got.

Bravo !.
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Old 3rd May 2021, 8:48 pm   #47
audiokit
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Default Re: INS8073 - What I wanted, but never got.

NIBL and Tiny basic are very similar. One difference i found on start up was that you have to tell Tiny basic where you want to store the program by typing "NEW #1000 " followed by NEW. This way you can store several programs at different memory locations. In NIBL you can run several programs in different pages. If you don't type the NEW command, you get an error after every line you type.
The fluent overflow from basic to machine code is the same. LINK, TOP, STAT the use of @ to choose an 16-bit address are all the same. I miss Karen's "page 2" though, page 2 with it's simple assembler and abbility to show blocks of memory brings you so much closer to machine language without really leaving BASIC.
One other thing that is different: the INS8073 becomes a bit warmer than the INS8060.
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Old 3rd May 2021, 10:34 pm   #48
Mark1960
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Default Re: INS8073 - What I wanted, but never got.

I didn’t notice my INS8073 running warmer than the INS8060.

Did you leave any inputs floating?

I wonder if yours is an NMOS version of the INS8073, mine has date code 8352, and there is a note in the feb81 data sheet that they are now shipping XMOS.
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