I had a Commodore Plus/4 in the mid to late 80's as my main computer when I was in junior high and high school. My friend who had a C64 criticized me because the thing had no SID chip and was incompatible with the C64. I got it because at the time is was cheap and it's what I could afford. Unfortunately, I never had working joysticks and the games were very few. But I did manage to write a windowed terminal program in basic and 6502 assembly on the thing using an RS-232 interface. I played Zork II on it, but never did solve that game. For the life of me, I just don't remember what happened to it, if it was thrown away, if I sold it, gave it away, it's unbelievable that I can't remember that. But after seeing all the things people are doing with it now, I'm very tempted to get it back from EBAY and actually have one again. I was even on a live stream with Bil Herd, the original designer of this computer, and he was excited that I commented I had a Plus/4 back in the day.

was my first computer in 87/88 i got 2nd hand and is only machine i dont own ,have amiga c64 ect but would love a plus 4 again xx well jealous xx

Need to get my two Plus/4 running again.

@Re-Tech

2 жыл бұрын

Give it a go - What have you got to loose. :) Cheers Phil

@jamesdecross1035

Жыл бұрын

@@Re-Tech I got the two running. Easy fix by swapping chips. Lovely machines. Now, I've got two more with a trickier RAM fault.

The Plus 4 was released near the end of the life cycle of the C64. That's the reason why it really never caught on.

@Re-Tech

2 жыл бұрын

Plus it was 3 times its envisaged retail price. It was meant to cost around the $75 dollar mark, but it was sold at the same cost as the C64. The killer for the unit is it was sold as a business model and not an all rounder or a games /home computer. They are quite rare in working condition which is why they are becoming very collectable. ;) Cheers Phil

I have a dead plus/4, i tried to diagnose whats wrong, i get activicity at the address and data lines at the cpu and the ted chip, but not picture. Not even black screen, i connect with the same monitor cable used for vic20 and c64, and the cable works. But nothing, i saw some one suggested it could be logic ic's so i bought some, and i replaced the 74ls139, it was a long shoot, but it did not solve anything. I dont have any spares i can swap so its kind of hard, i guess it could still be a problem with the cpu or the ted :(

Sorry I was hoping that this guide will be: please check PSU and power computer, measure 5V VCC line on pin # or another. Use oscilloscope and check activity on TED clock (U1, PIN14), check clock out on F0 (pin12) no- pull out CPU, check again, your TED is dead, throw away computer. If ok, check CPU clock, check RAM and etc. Now I see how to remove screws and how nice other guys made replacement chips...

I got one of these a while ago, I'm going to trying making games for this. If you know how to program c64 I think you are most of the way to knowing how to program this. Even if a system has not many games its still fun to try and make graphic demos.

Great video! Are you in the FB C16/plus4 group? If not ya should be.

@Re-Tech

2 жыл бұрын

I will have to Join. Thanks for reminding me :)

You have an extensive collection. Would you sell parts or all of it?

@Re-Tech

2 жыл бұрын

Id never Part of sell the Plus/4 mainly because I actually like them . Also the kids like playing Pets Rescue which has become a big hit with them. If I somehow receive broken parts for the Plus/4s and I manage to get them working I would possibly pass them once they are repaired. Thanks for your comments. Cheers Phil

@JimmyCall

2 жыл бұрын

@@Re-Tech ok