Beta-07 has improved support for the IBM Personal Computer Power Series 850 Model 6070 (RS/6000 7248 (43P)).

lolo799 wrote on 2025-08-13, 18:08:

I'll test the new version when I can, in a week or 10 days from now.

I have just released SIV V5.83 Beta-08 which further improves the Windows NT V4.00 SP2 + PowerPC support so please use that.

Sorry, it took a while.
The iBook hdd is having problems coldstarting.

lolo799 wrote on 2025-09-06, 16:44:

The iBook hdd is having problems coldstarting.

Thank you and I guess this is down to the age of the system. I had to replace the disk in my Motorola PowerStack as there were a vast number of bad blocks, I hope the replacement keeps working.

Since your last run I changed SIV to read the TB (mftbu+mftb) but the returned values are not what I expected which is why the speed is reported as 133 MHz, what speeds are reported when the system posts?

For PowerPC 604 I need to scale the value by 8 and wonder if I need to scale it by 30 for PowerPC 750cx, but feel I need to see what happens with a few other CPUs to figure out what is needed. Looking at http://www.cap-lore.com/code/TB/ it specifies scaling by 16.

red-ray wrote on 2025-09-06, 17:59:

Since your last run I changed SIV to read the TB (mftbu+mftb) but the returned values are not what I expected which is why the speed is reported as 133 MHz, what speeds are reported when the system posts?

The G3 cpu in my iBook is a 500MHz model, with a bus speed of 66MHz.
There's no such thing as a Post screen with system info on a new world mac (there is the Open Firmware shell but it doesn't show up by default) and the NT loader screen only shows the ram available.

You can see what the NT4 setup process looks like using Wack0's fork of the dingusppc emulator, here for example:
https://virtuallyfun.com/2024/07/22/a-quick-v … macintosh-0-05/