520st stopped recognising my gotek

Problems with your machine in general.
Noah199
Posts: 9
Joined: Sun Feb 25, 2024 2:10 pm

Re: 520st stopped recognising my gotek

Post by Noah199 »

LarryL wrote: Tue Mar 05, 2024 8:41 am looking at the photos 133134, 133209 and 133218 I am not sure, if the solder jumpers at the adapter are set right - if they are set at all???
The jumper pads are indeed unconnected.

Here's what I found out before I accidentally ripped some of them off: The top one is for connecting the flat cable's Drive Select 2 (pin 14) to either Drive A or Drive B Select on the ST. The bottom one is for connecting the flat cable's Drive Select 0 to either Motor On or Drive A Select on the ST.

A picture on the original offer's site for helping you set it up says you should leave the top three contacts unconnected and connect the center bottom pad with the bottom right pad if using a DS0 configured drive and a straight cable. This is connecting the floppy's DS0 to the ST's Drive A Select.

Since the bottom center pad is ripped off, I made that connection manually with the green wire you can see on the photos.

Also, the disk images are all valid, I even enabled forced write protect on the Gotek to avoid corruption. I can also switch between them normally. The Gotek is also probably not the problem, as the other one I have behaves the same when connected to the ST. And it works fine in my Amiga.
ijor
Posts: 439
Joined: Fri Nov 30, 2018 8:45 pm

Re: 520st stopped recognising my gotek

Post by ijor »

Noah199 wrote: Tue Mar 05, 2024 2:40 pm Also, the disk images are all valid, I even enabled forced write protect on the Gotek to avoid corruption. I can also switch between them normally. The Gotek is also probably not the problem, as the other one I have behaves the same when connected to the ST. And it works fine in my Amiga.
This seems to rule out the Gotek being the problem, indeed. Let's hope it's the adapter.
http://github.com/ijor/fx68k 68000 cycle exact FPGA core
FX CAST Cycle Accurate Atari ST core
http://pasti.fxatari.com
russellnash
Posts: 121
Joined: Fri Mar 26, 2021 2:46 pm

Re: 520st stopped recognising my gotek

Post by russellnash »

Seeing this thread inspired me to do something that I had been putting off for a long time, namely fixing up an external Gotek for my 520ST which isn't suitable for most of the Atari games adapted games on my Ultrasatan because few of them work with just 512K of RAM. One that comes to mind that does work is Ultima IV, but I cant think of another one. I saw the same adapter kit on ebay, but I often look for other sources because it is common that I cant buy things on ebay or they wont deliver to my part of the world. Often you can buy ready made hardware for not much more than a kit you have to assemble yourself. I bought this cable and it seems to work fine either as an A drive or a B drive. If what you are looking for is something that works more than the fun of assembling things yourself it is a good idea to look for alternatives.
Noah199
Posts: 9
Joined: Sun Feb 25, 2024 2:10 pm

Re: 520st stopped recognising my gotek

Post by Noah199 »

So, it's been a while, but I finally fixed it. I had put the project on hold for about a month because I got a bit demotivated, but after that, I decided, that it could really only be either the DMA or the FDC, so I bought one of each. When they arrived, I first swapped the DMA, since it was socketed from the factory, but it still didn't work. Then I desoldered the FDC, put a socket in it's place and installed the new one, lo and behold, this actually worked. Thanks everyone who replied here for helping me figure this out, you're all amazing.

Some pictures of the chips, and of course, the end product:

The broken FDC I removed
The broken FDC I removed
IMG_20240425_175544.jpg (152.84 KiB) Viewed 582 times
The working new FDC I bought online
The working new FDC I bought online
IMG_20240425_175511.jpg (251.36 KiB) Viewed 582 times
The setup, all working fine now
The setup, all working fine now
IMG_20240425_203517.jpg (205.59 KiB) Viewed 582 times
User avatar
Badwolf
Posts: 2280
Joined: Tue Nov 19, 2019 12:09 pm

Re: 520st stopped recognising my gotek

Post by Badwolf »

Well done. Got there in the end. Sounds like perhaps something did go wrong with that adapter at some point.

BW
DFB1 Open source 50MHz 030 and TT-RAM accelerator for the Falcon
DSTB1 Open source 16Mhz 68k and AltRAM accelerator for the ST
Smalliermouse ST-optimised USB mouse adapter based on SmallyMouse2
FrontBench The Frontier: Elite 2 intro as a benchmark
Post Reply

Return to “HARDWARE ISSUES”