Another Egyptian Enterprise 64

[rubber_jonnie]

OK, so back to this fella.

I ran the following this morning:

10 for n = 40 to 130
20 print chr$(n);
30 next n
40 goto 10

and it crashed with this after about 30 minutes:

PXL_20260814_080917462.MP.jpg (300.84 KiB) Viewed 41 times

So I'm currently running the boot up extended test:

PXL_20260814_081226274.jpg (309.23 KiB) Viewed 41 times

And it seems fine but stops at testing refresh, though it does not hang and the machine will continue as expected.

I have it sitting in the word processor just now and also will try it sitting at the 'ENTERPRISE' logo later.

I did check with my thermal camera and there are 2 RAM ICs that are cooler than the rest, but I'm not convinced just yet.

I did also try the new screws and they fit perfectly

Need to sort out PCBs for RAM expansion and FDD interface next I think, but lets get the crashy issue resolved first.

[PhilC]

@rubber_jonnie I'll sort out the PCBs soon, not been up to much with the hot weather.

[stephen_usher]

That extended test always stops at the "Testing refresh" and never stops until you hit a key. Seems a bit silly not to report back.

[rubber_jonnie]

And a crash in word processor mode after about 40 minutes:

PXL_20260814_085724366.jpg (261.78 KiB) Viewed 32 times

I may swap in the old ROM to see what happens with the word processor.

[rubber_jonnie]

That extended test always stops at the "Testing refresh" and never stops until you hit a key. Seems a bit silly not to report back.

Yeah, thats a bit dumb...

[rubber_jonnie]

Old ROM is in and so far the word processor is stable.

Perhaps an A15 issue?

Also I just noticed that the ROM file is 66KB and not 64KB when viewed on my Mac, which is odd as it shows as 64 on my windows machine.

It was downloaded on my Mac and I'm wondering if it has messed with it?

May download on my PC and try again with a different ROM.

[rubber_jonnie]

So it's looking like a ROM issue.

Bad ROM, bad burn or A15? Don't know but it's very stable with the old ROM in it.

I'll burn another copy of EXOS 2.04 to a different ROM and see if that helps, but it's been running for 50 mins now since my last post and seems fine sitting in the word processor.

[mrbombermillzy]

Looks like youve nailed it. However, Im going to say an apprehensive 'well done'.

I'll burn another copy of EXOS 2.04...

So is our esteemed forum leader Mr. Swinson writing ROMS for Enterprise 64s now?

[stephen_usher]

What sort of ROM are you using, Winbond WD27C512-15?

[rubber_jonnie]

Looks like youve nailed it. However, Im going to say an apprehensive 'well done'.

I'll burn another copy of EXOS 2.04...

So is our esteemed forum leader Mr. Swinson writing ROMS for Enterprise 64s now?

Still running after lunch, so it would seem to be ROM related.

As for @exxos writing ROMS for the enterprise, he has one to many X's in his moniker