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/

lolo799 wrote on 2025-09-07, 09:10:

The G3 cpu in my iBook is a 500MHz model, with a bus speed of 66MHz.

I have been looking into what is happening and it seems that the TB register is not derived from the CPU speed, but rather the FSB speed.

After discovering this I have been pondering how to get the FSB to CPU speed ratio, on recent x32/x64 systems (PentiumPro and later) it's quite easy as it's in a MSR, but for PowerPC this is not the case.

I have just uploaded SIV32P V5.83 Beta-09 which should work, please will you try it and post new save files?

Below is what I got in testing, you should get similar, but with a x7.5 rather than a x2 multiplier. The code should also work when the FSB is 100 MHz, etc., but I don't have a system I can test this on.

Here you go:

lolo799 wrote on 2025-09-08, 17:58:

Here you go:

Thank you, the ratio calculation worked as I hoped it would. I have just uploaded SIV32P V5.83 Beta-10 which includes a few more improvements, it really needs to be validated with a few more CPU types/speeds though.

Above is using the Tahoma font, below is what happens when it's not installed.

I tried with the Tahoma font, it's not working too well:

lolo799 wrote on Yesterday, 19:57:

I tried with the Tahoma font, it's not working too well:

In what aspect? Looking in the save file at Menu->Machine->SIV Setup then Arial is reported, I need to see the bottom line of [About] to be sure what font is being displayed.

My system @ 8: English - Font: Tahoma (Proportional Western) Weight 400 Point Size 8 Cell Size 6×13 Line Height 14.5
My system @ 9: English - Font: Tahoma (Proportional Western) Weight 400 Point Size 9 Cell Size 7×14 Line Height 15.75
Old Save File: English - Font: Tahoma (Proportional Western) Weight 400 Point Size 8 Cell Size 8×16 Line Height 18 - Note: Tahoma was not installed
New Save File: English - Font: Arial (Proportional Western) Weight 400 Point Size 8 Cell Size 6×14 Line Height 15.75

With a point size of 8 the Arial cells are about the same size as Tahoma with a point size of 9. You could use Menu->Tools->Font to set Tahoma with a point size of 9

Original

Tahoma 8 point

Tahoma 9 point

System - Arial I suspect

I had made the save local report while using the Arial font.

Tried Tahoma with a 9 font size:

red-ray wrote on Today, 08:32:

lolo799 wrote on Yesterday, 19:57:

I tried with the Tahoma font, it's not working too well:

In what aspect?

lolo799 wrote on Today, 11:19:

Tried Tahoma with a 9 point font size:

Thank you, I am still unclear as to why you feel "it's not working too well".

Using 8 point Ariel I expect many of the SIV screens will to too wide to fit on your screen

red-ray wrote on Today, 14:23:

Thank you, I am still unclear as to why you feel "it's not working too well".

Using 8 point Ariel I expect many of the SIV screens will to too wide to fit on your screen

The text is cut off in many places, for example on the left side, Chips without the number, below CPU-0 with a missing half, the FSB MHz missing the Hz.

lolo799 wrote on Today, 15:01:

The text is cut off in many places

Thank you, I am unsure where the issue is as when the panel is rendered on this system there is no truncation.

The CPU-0 + GPU-0 cells are 7 characters wide so should not get truncated.

I felt I should try Windows XP @ 1024 x 786 and again there is no truncation.

I suspect the truncation may be down to the graphics driver.