Fixing up my MEGA STE

[Bikerbob]

OK, the media change mod? any pics of one done? OR a guide? if not thats cool.

OK, id mods I have done on the 920s .. thanks Chris.

thats what I thought troed, from everything else I have read.

I guess that 1 wire mod Alison did wont damage anything to try, can I get that program you made Chris so that I can test the mod?

Thanks guys.. sorry.. I am now playing with my VME video card.. everything is in german.. sigh..

SO, I can get the video card to boot up.. awesome!! but if I access the floppy (only the floppy) HD access is fine.. the system gives me 4 bombs and crashes. ahhh this is my hobby.. lol

James

[exxos]

download is here..

http://www.exxosforum.co.uk/atari/last/f ... dex.htm#V6

[Bikerbob]

Thanks Chris, but I was refering to the diagram at the start of the thread. The one you got from PP site.

Wondering if anyone has done that. and pictures of it.

James

[Bikerbob]

Wow, last post on this was Dec 2017.. this hobby is off and on when you have the time it would seem.

Well I just did my A/B switch on my MegaSTE.. that was super easy as the W401 and W402 are jumpered, so it was just a matter of jumpered wires to a DPDT switch and I have my A/B woot!

Removed the internal Scsi controller, because I see nothing I can use it for. IF I do Pputnik mod, I can do a larger drive, but then I have to pay for a 15+ year old SCSI to mount.. does not seem worth it.

I looked around but could not seem to find where I posted this.. but I wanted to put a DMA Activity LED where the HDD led would be.. aka - any activity on the DMA (HDD) bus would show on this .. so either Internal or external. My cosmos is at the back of the machine, so I cannot see any status light on it.
Does this look right? I just drew this up a while back , and thought I had asked for opinions. but cant find them.

LED1.jpg (19.51 KiB) Viewed 6616 times

James

[Bikerbob]

Thought I would add here because I dont want to start a new thread.

I am finally getting to installing my FPU in my MSTE

I am using a Minipro TL866cs to program the GAL using MSTE_881.jed

Setup fine, drivers, software all good. I set the chip type.. no problem.. load the file and I can program it.

You can see that it successfully programs..

866cs_gal.jpg (257.7 KiB) Viewed 6565 times

But it will not verify (V)erify from the menu.. after I have run the program. Also to visually look at the addresses they are not the same.

What about this LOCK bit?? Any help on this would be appreciated.



James

[exxos]

It says its verified on your image..

You can't verify GAL's once the lock bit is set (its code protection, so will just read all 1's normally)

[Bikerbob]

Thanks so much Chris, that answers it for me..

It verified after I did it.. then it put the lock bit on it.. now it cant.

Fantastic.. I will install my FPU and then find something that needs a trig or algebraic calc.. MUHAHA! lol.. Pointless upgrade.. but its my hobby damm it.

SOMEONE GET ME A MONSTER BOARD!!! Sounds like there are lots wanting them.. wonder why Alan has not done another batch?

James

[exxos]

No idea about Alan. He seemed to have vanished even before I left AF.. I guess you could always email him and ask why no new batches of stuff.

[Bikerbob]

OK.. first try with the GAL and the FPU did not work.. just blank black screen.

FPU seems good in its socket.. Jumper is off.. Gal is in.. but no join.

I will try another GAL with no lock bit.

James

40mins later.. YES .. working with no LOCK bit.

UP and running.. according to SYSINFO

[rubber_jonnie]

@Bikerbob did you manage to get the JED file and GAL for this project? If so can you confirm the GAL part number (Looks like a 16V8D 15LPN),and could you please post the JED file here.

Thanks.