exxos's Atari, Amiga & retro forum

@PhilC I'm attaching my rom file. Since we are using the same programmer GQ-4x4, can you check it out for me to see if it looks right?

Thanks,

Ken

Does 27C4096 plug straight into the machine?

I could do a 27C200 to AM27C4096 adapter PCB if anyone is interested? It wouldn't take long to do. M27C400 are common for Amigas and that is the pinout of my kickswitcher.

cmorley wrote: 11 May 2020 14:07 Does 27C4096 plug straight into the machine?

I could do a 27C200 to AM27C4096 adapter PCB if anyone is interested? It wouldn't take long to do. M27C400 are common for Amigas and that is the pinout of my kickswitcher.

Which machine? The GQ-4x4 has an adapter that accepts the 27C4096 eprom.

Here’s what the adapter supports: 28F102,27C1024,27C2048, 27C4096,27C210,27C2002,27C4002,27C400, 27C800, 27C160, 27C32289.

Glorfindeal wrote: 11 May 2020 14:00 @PhilC I'm attaching my rom file. Since we are using the same programmer GQ-4x4, can you check it out for me to see if it looks right?

Thanks,

Ken

I think your image is byteswapped, having just compared it to a known working 1.62/2.06 image I have. Cartman will fix it.

Glorfindeal wrote: 11 May 2020 14:23 Which machine? The GQ-4x4 has an adapter that accepts the 27C4096 eprom.

The ST. I just looked at a picture of the Tos adapter and it is a PLCC EPROM you're talking not DIP so never mind. It would need a 40-pin DIP adapter to dual ROMs for my thing. As you were... :-?

Glorfindeal wrote: 11 May 2020 14:00 @PhilC I'm attaching my rom file. Since we are using the same programmer GQ-4x4, can you check it out for me to see if it looks right?

Thanks,

Ken

According to @PhilC his images need a byte order where the text is readable which your image has. The second image starts at 0x40000 which is correct. If I were to burn your image I would be creating slugs while it should be good with your burner. As you can see the embedded text is readable.
The second image starts at 0x40000 correctly. Looks like 2.16 which is PP's improved TOS.

Glorfindeal wrote: 11 May 2020 14:00 @PhilC I'm attaching my rom file. Since we are using the same programmer GQ-4x4, can you check it out for me to see if it looks right?

Thanks,

Ken

Hi Ken,

So this is looking at it in the windows version of the GQ software than I use and in that version the text should be byte swapped, ie not readable. Your text is actually readable, so like RJ says, you need to byte swap it.

The confusion lies with not all eprom programmers being the same unfortunately.

I'll try and download the Mac app you said about in a minute and will have another look at your file then.

PhilC wrote: 11 May 2020 16:03 So this is looking at it in the windows version of the GQ software than I use and in that version the text should be byte swapped, ie not readable. Your text is actually readable, so like RJ says, you need to byte swap it.

The confusion lies with not all eprom programmers being the same unfortunately.

I'll try and download the Mac app you said about in a minute and will have another look at your file then.

This is a lot easier with 8 bit rom... just swap them if it doesn't work. I was looking for my erasable eprom which I couldn't find so I ordered some more from China. Also spotted this puppy.. great price. The company EEtools who builds my programmer wanted 180 bucks for it. So if your programmer supports a 44 pin dip package this is a pretty good buy:

Ok, so i've also looked at it in Hex Fiend and the text is not reversed.

As I said earlier, if you were using the mini pro app that comes with the TL866 then this would be correct. But if you are using the windows app for the GQ 4x4 v2 programmer then that same file would write a garbage eprom as it would need to be byte swapped in the case of this programmer.

Now when I first used the GQ 4x4 I wrote a couple of garbage eprom before I worked it out, which wasn't a problem because I was able to erase the eprom and start again. The way that I found out that what I had written needed byte swapping was by reading a known working rom and viewing that in the built in hex viewer of the eprom programmer software.

So you mentioned that you use a Mac, what software are you planning to use to burn your eprom with? If its a free program I will download it and work out which way the rooms need to be made.

Alternatively, if you're using the windows GQ software then I can probably send you a working TOS1.04/2.06 image to try?

I’m using Parallels Desktop on my Mac. I’m running Windows 10. There isn’t a program for the GQ-4x that runs on the Mac. There is one for the GQ-5x but that doesn’t burn EPROMs. I downloaded Cartman on Windows and it is pretty fool proof. If you haven’t downloaded it yet, you should take a look at it. You load the file and there is a button to push that does the byte swap. It also splits 16 bit into 2 8 bits and other things.

Ken