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2018-05-10 15:33

hedning

Registered: Mar 2009
Posts: 4598

Release id #120907 : Wonderland XII

Possible loader issue (mainly aimed at Bob, HCL and Krill, I presume): I have had a discussion with a friend of me who always had the demo crashing on a 1541C. It always crashed on the same place, and with working disks (same disks run fine on his FD-148). The crash occurs directly after this part and before the "clock":

I thought it was his faulty drive or something, but agreed on testing the demo on a couple of my drives. We also checked out how the drivespin looked like (with Speed in 1541 Diagnostic Cartridge V1.0 [8kb cartridge]). My friend's 1541C had 301.5 RPM, so I did the same test with the drives I had here, with these results:

1541-II (original ROM): 299.5 RPM. Demo runs fine.
1541-II (JiffyDos): 300.5 RPM. Demo runs fine.
Oceanic (JiffyDos): 300.3 RPM. Demo runs fine.
1571 (original ROM): 300.2 RPM. Demo crashed on disk 1.

But now the interesting part. I get the same error on my 1541C with 300.2 RPM: Crash every time as the same spot as my friend's 1541C.

Can this be specific for this demo, or something in the loader? Is the 1541C ROM different from an original 1541? Can that be the issue?

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2018-05-10 19:12

carlsson

Registered: Nov 2002
Posts: 41

Quote: Sure. Should I send it to you?

No need to really. Just run comp, cmp or whatever your binary comparison tool is called on your favorite OS. If it says the file (minus any headers) is different to both known dumps, perhaps Bo and other ROM collectors will want a look. If it is identical to an existing one, anyone who gets emulation to work can use an existing known good dump.

2018-05-10 20:37

hedning

Registered: Mar 2009
Posts: 4598

My 1541C is rev 1 too, just as the other failing one.

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