Sprinter II upgrade for the TRS-80 Model I. Upgrades your computer speed from 1.77MHz to 5MHz and includes the Z80B CPU. It\'s a modern day repro of the old Holmes kit which has not been available since the early 1980s.
This is a kit for hackers and not novices... 4 wires need to be soldered and depending on certain aspects of your Model I (Ram speed, mainly) you may need to upgrade other parts of your Model I, like Ram chips.
If you have any questions please ask me before offerding,
You get the Sprinter II withZilog Z0840006PSC (or aZ80B CPU) installed and the instruction manual re-print as pictured.
Worldwide shipping is $12.50
(C-19 advice: due to the pandemic shipping times to the USA range from 7-9 weeks, sometimes less but usually 5+ weeks.)