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Question about MC68HC05.ROM?
Posted: May 15th, 2025, 5:08 am
by nedrysoft
I must be missing something entirely obvious, but how do you get the emulator to use this ROM?
I've set it to use it in the settings, I've tried putting it in the root with the emulator and also in folder named BIOS, but when I go to the disassembler at that the location where the disassembly appears in memory it's just filled with zeros?
I can't seem to figure out how to get it to work.
Any ideas?
Thanks
Re: Question about MC68HC05.ROM?
Posted: May 15th, 2025, 10:01 am
by nocash
From the help text:
Code: Select all
CDROM BIOS Image
If present, file MC68HC05.ROM (16.5kbytes) is loaded automatically as CDROM
BIOS image (alternately it can be loaded manually via file menu, which treats
any 16.5Kbyte .ROM file as CDROM BIOS image). The file (is) used ONLY if low level
CDROM BIOS emulation is enabled in setup.
In low level mode, timings and responses to cdrom commands are closer to real
hardware, which might be useful for bug testing, but otherwise it isn't too
useful or recommended (the more accurate seek times are making the cdrom
emulation much slower; the SCEx protection is also emulated, meaning that
region problems may occur when using a CDROM BIOS version that doesn't match
the CDROM DISC region).
In the debugger, use Ctrl+T toggle between MIPS and HC05 disassembler view. The
TTY window can log various HC05 I/O events (eg. Spindle and Sled control).
The file location should be same as the no$psx.exe file (or anywhere if you load it via GUI, from inside of the "insert cdrom" file menu). The 16.5Kbyte should contain both the firmware & bootstrap ROM).
Re: Question about MC68HC05.ROM?
Posted: May 17th, 2025, 9:00 am
by nedrysoft
Many thanks, I’ll try another dump, I guess the one I tried was missing something.
I appreciate all your work on the PS1.
