DOS.YML

This page will expand on the information here:

• https://github.com/PureDOS/DAT/tree/main/yml

That page should be read first.

CPU

cpu_year

This table shows how cpu_year corresponds to cpu_cycles. This information can be found in the source code here:

• https://github.com/schellingb/dosbox-pure/blob/main/dosbox_pure_libretro.cpp#L590

An equivalent CPU model is also shown, but note that this is very rough - DOSBox cycles cannot truly be converted to real CPU performance.

cpu_year	cpu_cycles	CPU
< 1982	315	8088 @ 4.77 MHz
1982	900	8088 @ 8 MHz
1983	1500	286 @ 10 MHz
1984	2100	286 @ 12 MHz
1985	2750	386 @ 16 Mhz
1986	3800	386 @ 20 MHz
1987	4800	386 @ 33 MHz
1988	6300	386DX @ 33 MHz
1989	7800	486SX @ 25 MHz
1990	14000	486DX @ 33 MHz
1991	23800	486DX @ 50 MHz
1992	27000	486DX @ 66 MHz
1993	44000	Pentium @ 60 MHz
1994	55000	Pentium @ 75 MHz
1995	66800	Pentium @ 100 MHz
1996	93000	Pentium @ 166 MHz
1997	125000	Pentium @ 200 MHz
1998	200000	Pentium II @ 300 MHz
1999	350000	Pentium II @ 450 MHz
> 1999	500000	Pentium III @ 600 MHz

DOSBox Pure performance setting

This table shows DOSBox Pure's emulated performance settings, found under Core Options -> Performance. These options do not necessarily correspond exactly with the cpu_year settings. Note that the CPU is a rough equivalent - DOSBox cycles cannot truly be converted to real CPU performance.

This information can be found in the source code here:

• https://github.com/schellingb/dosbox-pure/blob/main/core_options.h#L344

Year	Cycles	CPU
1980	315	8086/8088, 4.77 MHz
1982	1320	286, 6 MHz
1985	2750	286, 12.5 MHz
1987	4720	386, 20 MHz
1989	7800	386DX, 33 MHz
1990	13400	486DX, 33 MHz
1992	26800	486DX2, 66 MHz
1995	77000	Pentium, 100 MHz
1997	200000	Pentium II, 300 MHz
1999	500000	Pentium III, 600 MHz
2000	1000000	AMD Athlon, 1.2 GHz

DOSBox-X CPU speed setting

This table shows DOSBox-X's emulated CPU speed setting. Again, this is only approximate, as DOSBox cycles cannot be converted into real CPU performance. As a different emulator, DOSBox-X also can't be equated to DOSBox Pure - this table is only here for a quick and rough comparison.

This information can be found in the source code here:

• https://github.com/joncampbell123/dosbox-x/blob/master/contrib/translations/en/en_US.lng#L2489

CPU	Cycles
8088 XT 4.77MHz	240
286 8MHz	750
286 12MHz	1510
286 25MHz	3300
386DX 25MHz	4595
386DX 33MHz	6075
486DX 33MHz	12010
486DX2 66MHz	23880
486DX4 100MHz	33445
486DX5 133MHz	47810
Pentium 60MHz	31545
Pentium 66MHz	35620
Pentium 75MHz	43500
Pentium 90MHz	52000
Pentium 100MHz	60000
Pentium 120MHz	74000
Pentium 133MHz	80000
Pentium 166MHz MMX	97240
AMD K6 166MHz	110000
AMD K6 200MHz	130000
AMD K6-2 300MHz	193000
AMD Athlon 600MHz	306000
Pentium III 866MHz EB	407000