Harris CS80C286 -20

As mentioned in the story of this 8MHz 286 some companies made 286's running at 20 or 25MHz. Harris was one of those manufacturers to get these 286-beasts on the planet.

I bought the 20MHz 286 long time ago and haven't seen another 20 or 25MHz 286 (with motherboard) for quite a long time. Only every now and then some pop up on eBay, but with working motherboard they are quite rare.

Unfortunately there is one caveat with my Hedaka motherboard for the 286: it has 1 wait-state memory access. This hurts performance and will cause the system to perform in the ballpark of a 16MHz 286 in several cases.

CPU (chipset)	ChipTest RAM	score
NG80386SX -20 (OPTi82C/0WS)		9.50
Am386 DX40 (MX83)		8.09
i386 SX25 (WDC ISA)		6.50
NG80386SX -20 (F82C836 16k)		5.71
i386 DX25-IV (OPTi)		5.71
80286 -12-N (Suntac ST62C/0WS)		5.69
CS80C286 -20 (Hedaka/1WS)		4.50
V 30 (IBM 8530)		1.88
8086 -2 (IBM 8530)		0.92
8088 -1-P (ARC-88)		0.72
8088 D (ARC-88)		0.37
CPU (chipset)	DOSBench	score
Am5x86 -P75 (UMC PCI)		16295.00
Pentium 75 (430VX)		16147.00
Pentium Overdrive 83 (UMC PCI)		15764.00
Kingston TC5x86 /133 (UMC PCI)		15189.00
Am486 DX4/120 (UMC PCI)		15091.00
Cx5x86 100GP (UMC PCI)		15022.00
K5 PR133 (430VX)		14360.00
Cx486DX4 100GP4 (UMC PCI)		14159.00
K5 PR100 (430VX)		13836.00
Pentium 60 (Hendrixx)		13487.00
Am486 DX4/100 (UMC PCI)		12677.00
K5 PR90 (430VX)		12567.00
i486 DX4/100 (UMC PCI)		12256.00
80486 80MHz (UMC PCI)		11670.00
ST486DX2 80GS (UMC PCI)		11670.00
Cx486DX2 80GP (UMC PCI)		11670.00
5k86 P75 (430VX)		10355.00
Am486 DX2/80 (UMC PCI)		10241.00
TI486DX2 G66 (UMC PCI)		9765.00
Cx486DX2 66 (UMC PCI)		9674.00
80486 66MHz (UMC PCI)		9673.00
i486 DX2/66 (UMC PCI)		8727.00
Am486 DX2/66 (UMC PCI)		8613.00
i486 DX2/66 (UMC PCI)		8519.00
DX2ODPR 66 (UMC PCI)		8519.00
Am486 DX2/50 (UMC PCI)		6592.00
DX2ODP 50 (UMC PCI)		6590.00
ODP486SX 25 (UMC PCI)		6590.00
i486 DX2/50 (UMC PCI)		6590.00
i486 DX50 (UMC PCI)		6577.00
Cx486DX 40GP (UMC PCI)		5370.00
Cx486DRx2 33/66GP (UMC+Cx487)		5034.00
i486 DX33 (UMC PCI)		4425.00
Cx486DLC 33GP (ETEQ+387-40)		2698.00
Nx586 P90 (NxVLB)		1706.00
i386 DX25-IV (OPTi+387-40)		1451.00
Cx486DRx2 33/66GP (UMC)		706.00
i486 SX2/50 (UMC PCI)		632.00
Am386 DX33 (ETEQ+387-40)		567.00
i486 SX33 (UMC PCI)		424.00
V 20 (TurboXT+8087)		398.00
Cx486DLC 33GP (ETEQ)		357.00
V 20 (ARC-88+8087)		333.00
8088 -1-P (ARC-88+8087)		321.00
i486 SX25 (UMC PCI)		320.00
Am386 DX40 (MX83)		307.00
i486 SX20 (UMC PCI)		256.00
Am386 DX33 (ETEQ)		251.00
Am386 SX40 (ALi M1217)		200.00
Am386 SX33 (ALi M1217)		164.00
i386 DX25-IV (OPTi)		163.00
i386 SX25 (WDC ISA)		137.00
NG80386SX -20 (F82C836 16k)		136.00
NG80386SX -20 (OPTi82C/0WS)		117.00
CS80C286 -20 (Hedaka/1WS)		107.00
NG80386SX -16 (?)		92.00
80286 -12-N (Suntac ST62C/0WS)		80.00
R80286 8 (?)		43.00
CG80286 6 (IBM 512k)		32.00
V 30 (IBM 8530)		29.00
V 20 (TurboXT)		27.00
V 20 (ARC-88)		22.00
8086 -2 (IBM 8530)		18.00
8088 -1-P (ARC-88)		16.00
8088 D (ARC-88)		8.00
CPU (chipset)	Landmark 6	score
Am386 DX40 (MX83)		69.00
i386 DX25-IV (OPTi)		36.00
i386 SX25 (WDC ISA)		34.00
NG80386SX -20 (F82C836 16k)		30.00
CS80C286 -20 (Hedaka/1WS)		27.00
NG80386SX -20 (OPTi82C/0WS)		27.00
80286 -12-N (Suntac ST62C/0WS)		18.00
V 30 (IBM 8530)		7.47
8086 -2 (IBM 8530)		5.29
8088 -1-P (ARC-88)		5.09
8088 D (ARC-88)		2.44
CPU (chipset)	NSSI	score
Am386 DX40 (MX83)		11615.00
i386 DX25-IV (OPTi)		5855.00
NG80386SX -20 (F82C836 16k)		5436.00
i386 SX25 (WDC ISA)		5375.00
NG80386SX -20 (OPTi82C/0WS)		4839.00
CS80C286 -20 (Hedaka/1WS)		3860.00
80286 -12-N (Suntac ST62C/0WS)		3228.00
CPU (chipset)	PC-Tools	score
Am386 DX40 (MX83)		22.60
i386 DX25-IV (OPTi)		12.40
CS80C286 -20 (Hedaka/1WS)		10.30
i386 SX25 (WDC ISA)		10.30
NG80386SX -20 (F82C836 16k)		9.70
NG80386SX -20 (OPTi82C/0WS)		9.10
80286 -12-N (Suntac ST62C/0WS)		7.20
CPU (chipset)	Wolfenstein 3D CPU	score
Am386 DX40 (MX83)		30.00
i386 DX25-IV (OPTi)		19.00
NG80386SX -20 (F82C836 16k)		15.00
CS80C286 -20 (Hedaka/1WS)		13.00
NG80386SX -20 (OPTi82C/0WS)		13.00
80286 -12-N (Suntac ST62C/0WS)		10.00