Reply 20 of 71, by JustJulião
- Rank
- Member
Chkcpu wrote on 2024-02-15, 16:48:I mostly agree, but looking at the IDT WinChip BIOS writers guide, I found this table on page 7: […]
weedeewee wrote on 2024-02-15, 14:17:Well the link you posted has a nice table, including a reference to the winchip-2A […]
H3nrik V! wrote on 2024-02-15, 13:58:Well, the link I posted, mentions a lot of non-integer multipliers, and the photo in the original post also shows 2.33 written on the actual cpu in question?
Well the link you posted has a nice table, including a reference to the winchip-2A
setting the multiplier to
5.0x 2.5x 5.5x 3.0x 2.0x 1.5x 3.5x 4.0x 4.5x means
2.33x 2.5x 2.66x 3.0x 3.33x 3.5x 4.0x 4.5x 5.0x actual multiplier
I mostly agree, but looking at the IDT WinChip BIOS writers guide, I found this table on page 7:
Winchip multipliers.png
When helping with beta testing my CHKCPU CPU Identification utility update last year, member Nemo1985 tested these settings on his WinChip 2A and confirmed this table to be correct, including the remap to 3.33x at the 2.0x setting. This means that the 2.0x multiplier is not available on the Winchip 2A.
@JustJulião, most tools won’t display these WinChip 2A multipliers correctly, but my DOS tool CHKCPU will. However, you will need to use the updated CHKCPU v1.27.1 for that. Older CHKCPU versions don’t support these weird multipliers. 😉
A link to my website is in my signature below. You can download CHKCPU there.Now about the BIOS of your jumperless QDI Titanium IB+ board. Both the latest June 1998 V1.5SL and the patched January 2000 V1.5SB beta BIOS don’t support the WinChip 2(A)(B). The original WinChip C6 is supported but when running a WinChip 2/2A/2B, the SpeedEasy CPU SETUP in Jumper Emulation Mode will allow control of the BF1/BF0 pins only, resulting in a possible selection of the first four multiplier settings from the above table. So BF2 is fixed at a logical “1” and can’t be controlled.
The BIOS will indicate the WinChip C6 multipliers for these four BF1/BF0 combinations, so for the WinChip 2A the translation will be:
BIOS Actual
x2, BF1/BF0=0/0 x2.5
x3, BF1/BF0=0/1 x3.0
x2, BF1/BF0=1/0 x3.33
x4, BF1/BF0=1/1 x3.5
I expect this is the behavior you get. Please let us know if you see something different.
Cheers, Jan
Wait... So you are the Jan Steunebrink. I used countless of your patched Bioses since I'm a teenager! This forum is amazing.
Btw, your utility got it right, it seems!
Thank you for your amazing work!