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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 20th Feb 2020, 11:32 pm   #121
John Earland
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Default Re: Commodore PET 3016

Hi, couldn’t wait. Everything is fine! I just had a thought-I’ve been connecting the buzzer to the top terminals... but it should have been the bottom ones! It worked. However, the buzzer I bought from eBay is no good-although I can hear the Space Invaders sound effects I also get a continuous bleep. I have a smaller buzzer that came with an Arduino kit and that worried perfectly! Although it is very quiet so I guess I’ll need an amplifier. I don’t know what type to get-any ideas? J
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Old 20th Feb 2020, 11:34 pm   #122
John Earland
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Default Re: Commodore PET 3016

Just seen your post-you are absolutely right! You’re a genius!
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Old 20th Feb 2020, 11:49 pm   #123
SiriusHardware
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Default Re: Commodore PET 3016

If you are looking at amplified sound, bear in mind that the amplifier will have to run on some sort of power supply, either a 9V battery or perhaps 5V taken from the PET's own internal power supply.

Here's a mono amplifier which includes an integral volume setting control:

https://www.ebay.co.uk/itm/LM386-DC-...K/254423474295

For any module like that, you will also need a conventional (low impedance) speaker to connect it to. Maybe you already have one.

You can also buy a mono amplifier kit complete with a speaker, which would be a good project to give you a little bit more experience with soldering:

https://www.kitronik.co.uk/2165-mono...ersion-30.html

Note the above kit has a fixed gain (no volume control) so you would have to experiment with resistor values or add a volume control yourself.
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Old Yesterday, 12:19 am   #124
SiriusHardware
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Default Re: Commodore PET 3016

You may also get louder sound out from your Arduino sounder if you drop the value of your series resistor to a lower value, try 470 ohms or 1K instead of 10K.
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Old Yesterday, 8:07 am   #125
John Earland
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Default Re: Commodore PET 3016

Thank you for all of this! I shall give it a go!
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Old Yesterday, 10:26 pm   #126
John Earland
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Default Re: Commodore PET 3016

Hi guys, I think I’m going to have a panic attack!
I was messing about with sound and now it’s all gone haywire! I type in BASIC commands and it returns ?SYNTAX ERROR. I think I’ve done something seriously wrong to it! Help!
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Old Yesterday, 10:57 pm   #127
John Earland
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Default Re: Commodore PET 3016

I found this on the web:
SYNTAX ERROR on every command and screen scrolling problems: I read of a case where on every command entered the system reacted with a "SYNTAX ERROR". Also when scrolling the screen, some characters change. This is a problem when the main CPU reads the video screen. When a command is entered, it is read from screen, not from some buffer memory. Also when the screen is scrolled, the data is read from the screen and written back to it. So both problems came from the same source, the bus driver that separated the video RAM from the CPU bus. It had a broken driver in one of the lines.

Any use?
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Old Yesterday, 11:31 pm   #128
SiriusHardware
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Default Re: Commodore PET 3016

I think to get to a position of sanity you are really going to have to get those sockets changed first because the behaviour of the machine was unpredictable to begin with.

When you asked about trying out your sound add-on I did almost say that when making modifications or adding things to any sort of system you really need to start with the system in full working order, otherwise if something weird happens, you don't know whether it was your mod / add-on that caused it, or whether it was going to happen anyway.

Try to be patient, get those sockets replaced and if there are still outstanding problems after that then at least they will be consistent and you should be able to fault find it more logically.

Almost all of the connections on the user port connector go back to the second 6520, so if you really feel your experiments have caused this latest behaviour try changing the second 6520 to see if that makes a difference. It might, but at the present time there's no way of knowing whether it is the chip or its socket which is causing this behaviour.
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Old Yesterday, 11:46 pm   #129
John Earland
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Default Re: Commodore PET 3016

You are quite right. I’m getting them changed next week!
I swapped on of the 2114s actually. Seemed to do the trick but as you say-who knows!!
Thank you for saving my sanity!
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