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== Common Modifications == * '''8 KB ZX81 ROM upgrade''' โ drops-in to give floating-point BASIC, SAVE/LOAD VERIFY and better editing (still no SLOW mode). * '''Composite video mod''' โ bypass RF can for crisp LCD/monitor output. * '''Full-travel keyboard''' โ external matrix wired to KB pins 8-15. * '''Internal 16 KB SRAM''' โ replaces external pack, eliminating โwobble.โ * '''Turbo crystal (3.58 MHz)''' โ simple Xtal swap for โ10% speed gain (requires retune TV).
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