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Fastest 8-bit microprocessor for multiply-accumulate?

Maybe you could have a look at the Motorola 68008; its architecture and machine language had much better reputation than Intel's ones in the 80s. Another point is that it runs at higher frequency than ...
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Comparing raw performance of the Z80 and the 6502

There is an issue that many just don't see. The 6502 has a very limited instruction set compared to the Z80. To write the same program, this could mean the Z80 needs much less memory and again that ...
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1 vote

Fastest 8-bit microprocessor for multiply-accumulate?

I grew up with the Z80 on CP/M systems but occasionally used the 6502 on Apple IIs and BBC micros. Over time I generally found the Z80 extensions to the 8080 instruction set saved a few bytes but ...
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2 votes

Fastest 8-bit microprocessor for multiply-accumulate?

My first thought was a 6809 as it is a true 8-bit microprocessor but you want "best performance" as measured in wall-clock time. A better choice would be a 68008 as it has 32-bit registers ...
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1 vote

Fastest 8-bit microprocessor for multiply-accumulate?

Not sure about calling an 80486 an 8 bitter even if you can throttle external access to 8 bits. For a 'real' 8051 job the Silabs EFM8 series aren't too shabby. I've run them at 72 MHz and the multiply ...
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1 vote

Fastest 8-bit microprocessor for multiply-accumulate?

You can sure consider a co-processor, e.g. AMD 29516. MPY16 series of multipliers can get you into ~50ns per operation level Compatible multipliers were made by Analog Devices (ADSP1016, 40-50ns at ...
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7 votes

Fastest 8-bit microprocessor for multiply-accumulate?

The Motorola 6809 was one of the first (the first?) 8 bit microprocessors with a multiply instruction implemented in hardware. It was even pre 1980, introduced in 1978. One MUL instruction took 11 ...
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7 votes

Fastest 8-bit microprocessor for multiply-accumulate?

I'll suggest the 8051. It's reasonably early (1980) and definitely 8-bit. There are modern derivatives like this claiming speeds of up to 430 MHz and including a 32-bit hardware multiplier, but if you ...
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48 votes
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Fastest 8-bit microprocessor for multiply-accumulate?

And sorry to nerd-snipe this, but of course the ideal candidate for a fast multiply-add is a Digital Signal Processor CPU, and nothing in your requirements says that DSPs are excluded. It will be also ...
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21 votes

Fastest 8-bit microprocessor for multiply-accumulate?

There’s probably another CPU meeting your criteria which beats this, but as a data-point, a number of x86 CPUs fit the bill. One is the 80C188 (introduced in 1987) which was available at frequencies ...
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