Start mame with overclock11/9/2022 ![]() ![]() The 5150 uses a 14.318MHz crystal feeding an Intel 8284 oscillator IC to generate its system clock. So I started researching options and came across a design for a “freeware” DIY board called the PC-SPRINT released by Doug Severson in 1985 - an early example of Open Hardware! It was also used in some PC compatibles, perhaps most notably the excellent Tandy 1000.Īnother advantage of the V20 is that it can run at up to 10MHz, making it ripe for overclocking. ![]() #START MAME WITH OVERCLOCK UPGRADE#The great thing is that the V20 was released in 1982 and was a common upgrade for the 5150, so it meets my vague criteria of “period correctness”. This results in up to 30% performance increase in a lot of applications. I’ve already swapped the CPU for an NEC V20 - an 8088 clone that added optimizations and even implemented the 80186 instruction set. But as anyone who’s read my previous ramblings on the subject will understand, I’m only interested in period correct solutions. I’ve been looking into overclocking my 19 PC - after all, the performance of that 4.77MHz 8088 CPU isn’t great by anyone’s standards. The original text remains below for reference. Update! There is now a PC-SPRINT GitHub repository covering all of the below and much, much more. DIY “Open Hardware” Module From 1985 - Build It Yourself! ![]()
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