The Sinclair QL Forum

Will James wrote:Hi XorA

I'm doing this as the first line in my m68k_write_memory_8() and m68k_read_memory_8()

address = address & 0x03FFFF;

Do you think that would cause the problem?

Tried 0x0FFFFF instead but it still crashes...

No that should be suitable!

If I remember my issues in emulation, Minerva actually requires that the memory wraps round at 24 bits. If it doesn't it goes wrong (TM).

Peter wrote:

XorA wrote: Sun Jul 13, 2025 10:35 am My emulator is based on Mushashi and boots Minerva fine.

That's good. Which of your emulators use Musashi, as you are maintaining several?

Sqlay3/sq68ux

Funny you should mention Minerva, as I get a perfect boot up to the F1 F2 screen with a JS ROM, but Minerva goes a bit wonky, I think it has a very different RAM test procedure...

Minerva is also more demanding in terms of correctness of the CPU emulation.
I would not take for granted that ...

It's an amazing bit of kit, I love mine on zx81

Okay, the microdrives are point I understand. For me they always were good riddance and unused for over 30 years, so I didn't consider.

It would probably not too hard to make microdrive work on a Pi connected to GPIO port. If someone was particularly driven!

One could use a kernel with ...

Okay, the microdrives are point I understand. For me they always were good riddance and unused for over 30 years, so I didn't consider.

It would probably not too hard to make microdrive work on a Pi connected to GPIO port. If someone was particularly driven!

ql_freak wrote: Thu Jul 10, 2025 10:14 pm  
I do not use a "completely different OS":

Code: Select all

PRINT#0,VER$!VER$(1)
JSL1 1.98

QPC2 is smsq/e only isnt it? Thats utterly different than the OS you are using in sQLux!

Because of the UPN problem mentioned in the starting thread: It seems the problem is with sQLux. On QPC2 UPN seems to be okay, i.e.
4 3*
results in 12 (on sQLux I get "Der Stack ist voll !" [the stack is full]) Sounds like the problem is the completely different OS your using not the emulator.

You would not normally use libc in romable programs anyway. Libc is not re-entrant and also relies on global state. This is true no matter the compiler.