Dell OptiPlex GX520 & GX620: CPU Upgrade to P4 and Pentium D

[DeathBringer]

OK. Download SYMCMOS and run in DOS:
SYMCMOS –v2 –lOLD.TXT
Post file old.txt

Code:

usage: SYMCMOS <options> -? show this help -D program BIOS default values -S[filename] produce symbolic report file -L[filename] produce literal report file -U[filename] update CMOS using script file -C[filename] combine build files -F[filename] use combine file for report -V0 disable logging -V1 enable error logging (default) -V2 enable verbose logging -V3 No CMOS update and verbose logging

[SeñorBIG]

receive an error with no log file generated:

Write literal report to file: OLD.TXT

combineFiles (0h, COMBINE.ROM)...
initPdmEntry ...
search '$PDM' ... not Found!
pdmEntry = NULL !

[DeathBringer]

Do you run in native DOS or command line in Windows?

[SeñorBIG]

through windows. should i run it in pure dos?

[DeathBringer]

Pure DOS only!

[SeñorBIG]

Tried in pure dos with dos running on a usb stick. gives the same error

[DeathBringer]

I found code that verify CPUID and Diagnostic LEDs. On error it set status number 0x16 (Alert! Incompatible processor detected.).

Code:

seg000:7F81 sub_7F81 proc far seg000:7F81 pushad seg000:7F83 call far ptr 0F000h:1CD9h seg000:7F88 jnz short loc_7FF4 seg000:7F8A mov eax, 1 seg000:7F90 cpuid seg000:7F92 cmp ax, 0F30h seg000:7F95 jb short loc_7FF4 seg000:7F97 mov ecx, 198h seg000:7F9D rdmsr seg000:7F9F test eax, 80000000h seg000:7FA5 jnz short loc_7FE7 seg000:7FA7 mov eax, 1 seg000:7FAD cpuid seg000:7FAF cmp ax, 0F44h seg000:7FB2 jb short loc_7FCF seg000:7FB4 cmp ax, 0F60h seg000:7FB7 jnb short loc_7FBE seg000:7FB9 cmp ax, 0F49h seg000:7FBC jnb short loc_7FCF seg000:7FBE seg000:7FBE loc_7FBE: ; CODE XREF: sub_7F81+36j seg000:7FBE call far ptr 0F000h:33E9h seg000:7FC3 jz short loc_7FCF seg000:7FC5 mov dx, 8B8h seg000:7FC8 in al, dx seg000:7FC9 and al, 2 seg000:7FCB cmp al, 2 seg000:7FCD jnz short loc_7FE7 seg000:7FCF seg000:7FCF loc_7FCF: ; CODE XREF: sub_7F81+31j seg000:7FCF ; sub_7F81+3Bj ... seg000:7FCF mov ecx, 1A1h seg000:7FD5 rdmsr seg000:7FD7 test eax, 40000h seg000:7FDD jz short loc_7FF4 seg000:7FDF test eax, 20000h seg000:7FE5 jnz short loc_7FF4 seg000:7FE7 seg000:7FE7 loc_7FE7: ; CODE XREF: sub_7F81+24j seg000:7FE7 ; sub_7F81+4Cj seg000:7FE7 push cx seg000:7FE8 mov cx, 16h seg000:7FEB call sub_9B4A seg000:7FEE pop cx seg000:7FEF call far ptr 0F000h:0A497h seg000:7FF4 seg000:7FF4 loc_7FF4: ; CODE XREF: sub_7F81+7j seg000:7FF4 ; sub_7F81+14j ... seg000:7FF4 popad seg000:7FF6 retf seg000:7FF6 sub_7F81 endp

But I can't edit BIOS But I found reason why this warning is occur on one board and don't on other. It's diagnostic chip that control Diagnostic LEDs.
BIOS with Pentium D always check value in I/O port with address 0x8B8.

[SeñorBIG]

maybe some of the guys from the dell section can help?

https://www.bios-mods.com/forum/Forum-Dell

[DeathBringer]

I don't think so.
Try this:
1.Restart your computer and tap F12 at Dell logo.
2.Select 'Diagnostics' and hit Enter.
3.Make a note of error code if any.

[SeñorBIG]

my system only has hard drive diagnostics