Search found 275 matches

by Gyro Gearloose
Tue Jan 14, 2020 1:10 am
Forum: Hardware
Topic: Excelerator plus pcb repair warning
Replies: 11
Views: 199

Re: Excelerator plus pcb repair warning

Turns out you can use ChipQuik with through hole parts although I've never done it. It might be something to investigate after all! Thanks!
by Gyro Gearloose
Tue Jan 14, 2020 12:58 am
Forum: Hardware
Topic: Excelerator plus stock ROM images?
Replies: 1
Views: 20

Re: Excelerator plus stock ROM images?

https://www.commodoreserver.com/PublicD ... 950E5F02EB

This only seems to work for the PCB with the single 16K ROM.
by Gyro Gearloose
Mon Jan 13, 2020 2:22 am
Forum: Hardware
Topic: Excelerator plus pcb repair warning
Replies: 11
Views: 199

Re: Excelerator plus pcb repair warning

I was beeping out the PCB to see what connects where, I found that having the pinouts of the chips right there next to the drive to be much quicker than constantly referring to the computer for separate datasheets. So I slapped some pinouts together into one page. It was pretty handy, especially for...
by Gyro Gearloose
Sun Jan 12, 2020 7:39 pm
Forum: Hardware
Topic: Excelerator plus pcb repair warning
Replies: 11
Views: 199

Re: Excelerator plus pcb repair warning

Well I think the problem now is I don't have the correct ROM images for this drive. Whoever had it before was probably experimenting on it and the EPROMs contain firmware for another variation.
by Gyro Gearloose
Sat Jan 11, 2020 7:43 pm
Forum: Hardware
Topic: Excelerator plus stock ROM images?
Replies: 1
Views: 20

Excelerator plus stock ROM images?

Where can I find the original ROM images for the two ROM version of the drive?
by Gyro Gearloose
Fri Jan 10, 2020 4:12 pm
Forum: Hardware
Topic: Excelerator plus pcb repair warning
Replies: 11
Views: 199

Re: Excelerator plus pcb repair warning

http://haroldsbeambugs.solarbotics.net/NewPCB/S2010029.JPG LOL that brings back memories. Check out the DIP patterns with the fat pads, those rounded rectangles. Betcha that daughterboard was drawn on a light table. This is how it was done without computers. Oddly there was already automated PCB ro...
by Gyro Gearloose
Fri Jan 10, 2020 12:26 am
Forum: Hardware
Topic: Excelerator plus pcb repair warning
Replies: 11
Views: 199

Re: Excelerator plus pcb repair warning

Something just occurred to me; that daughterboard looks hand drawn, those pads look just like the dry transfer decals they used to sell at Radio Shack.
The main PCB could have been designed by an entirely different team using CAD, but didn't quite set the parameters right.
by Gyro Gearloose
Fri Jan 10, 2020 12:01 am
Forum: Hardware
Topic: Excelerator plus pcb repair warning
Replies: 11
Views: 199

Re: Excelerator plus pcb repair warning

I believe that ChipQuik is used more for surface mount parts. A through-hole part has solder on both sides of the board and inside the via barrel. To get the ChipQuik to mix in with all that solder to bring the melting point down is not possible I think. You have to melt the old solder first anyway....
by Gyro Gearloose
Wed Jan 08, 2020 4:28 am
Forum: Hardware
Topic: Excelerator plus pcb repair warning
Replies: 11
Views: 199

Re: Excelerator plus pcb repair warning

I cleaned my desoldering gun to make sure it sucks well, I changed the tip to a 0.8mm instead of 1mm, I put fresh solder on the pins of the chip I wanted to remove, kept the temperature of the tip close to 650-700F (my gun is so old it doesn't have a temperature readout, I simply go by how fast it m...
by Gyro Gearloose
Mon Jan 06, 2020 7:57 pm
Forum: Hardware
Topic: 1541-ii head problem
Replies: 8
Views: 195

Re: 1541-ii head problem

I bought a used Chinon drive on eBay to repair this drive but it's in rough shape. The eject shaft has been cut off and the head, while measuring correct, has a scratch in it that might make it unusable.
I think I'll stick to 1581s from now on.