exxos's Atari, Amiga & retro forum

PaulJ wrote: 20 May 2020 13:23 @rubber_jonnie , sounds like you lucked out. At least I know there is a drive that will fit in the hole. :)

And it's part number :)

If you can get a pic of your 720KB drive I can compare with mine, see if you can get a 340 and just swap the front over.

Ya, @rubber_jonnie I will have to see what it has for a drive. Just know when I format a floppy there's no option for HD like the falcon has. Still working on the mega bus eprom emulator adaptor which is close.

PaulJ wrote: 20 May 2020 14:28 Ya, @rubber_jonnie I will have to see what it has for a drive. Just know when I format a floppy there's no option for HD like the falcon has. Still working on the mega bus eprom emulator adaptor which is close.

If the info is good (Fingers crossed) it will have an Epson :)

Megabus adaptor sounds real cool, I need to get my head around PCB design so I can do my own stuff like this, would go nice in my Mega4, as that still has a free Megabus slot, unlike my Mega1 that has an IDE adapter.

@rubber_jonnie just finished the mega bus version and will post the gerbers when its verified functional. Yes its great to finally be able to create a good pc boards. If I had a nickel for every time I've started and not finished. Really got close with Exxos's Eagle examples and this time I watched a lot of youtube video's to fill in the gaps. Next I'm doing a DC4 and DMAF2 disk controllers for the ole 6809 SWTPC machine.

looks good @PaulJ that board uses the same footprint as a 27c400 doesn't it?

PhilC wrote: 20 May 2020 18:05 looks good @PaulJ that board uses the same footprint as a 27c400 doesn't it?

Ya, he calls it "Emu 27C400" but it does like 3 or 4 different sizes and 8 or 16 bits. I use it as a 256k eprom which holds 8 TOS images. Want to try a different TOS image, just plug the usb cable into the mac and program one of the eight slots. Its been really reliable for me but in order to program things you need to use half duplex to talk to it or when you make programming entries they don't show up. Then when using half duplex the screen gets messed up with the command entries. It befuddles my mind. Here's a basic need which goes unaddressed and yet he adds a intel data format. Guess it must be something he needs. It has a lot of nice features, partial burns, byte reversal of the image plus a lot of other stuff. There's stuff there I have no idea what it does. Documentation is another weak spot. Other that the few tidbits and questions answered on the forum there's no documentation I'm privy to. None the lest it works well for me and is very convienent in its usage. If you want to play with it just plug in the devices usb connection while its still in the foam and you can access it, program it, etc.

I'm making an adaptor to plug it into the SWTPC 6809 machine. I'm making some changes to the boot rom and this is perfect development solution. I'll put it in byte mode and select pieces of the 256k slot via dip switches. The SWTPC machine wants to see like 2k rom images if I remember correctly. There will be some wasted space but hay.. in this environment who cares.

@PaulJ does sound interesting. Do you still need rom decoding for tos2.06?

PaulJ wrote: 20 May 2020 17:43 @rubber_jonnie just finished the mega bus version and will post the gerbers when its verified functional. Yes its great to finally be able to create a good pc boards. If I had a nickel for every time I've started and not finished. Really got close with Exxos's Eagle examples and this time I watched a lot of youtube video's to fill in the gaps. Next I'm doing a DC4 and DMAF2 disk controllers for the ole 6809 SWTPC machine.

mb.jpg

Nice job sir.

PhilC wrote: 20 May 2020 18:43 @PaulJ does sound interesting. Do you still need rom decoding for tos2.06?

Yes, anything that runs in the $e00000 area needs the enhanced decode that you can get from Exxos's IDE boards, decoder board, the Lightning ST, or possibly PP's IDE board. Sure there are other sources including roll your own... Also the $fc0000 decode coming from the glue needs to be combines as Exxos does for his eprom on the H4.

Thanks, that's what I thought.