falter
Veteran Member
I dusted off my Sinclair MK14 to check on and overall it seems ok except it cannot for some reason accept any keypresses. It has the newer monitor, so when you power up it shows 0000 00. If I press keys, nothing happens, except on a couple of keys like the 3 key, it will flash a zero very faintly in the space between the first and second set of 0s. But there doesn't seem to be any actual response from the monitor, no change in display as keys are pressed.
I'm concerned I may have damaged it.. when I connected it to a +9V power source (which goes to a 7805 regulator of course), I had miscalculated the required amperage. The required amperage is 400ma, but the adapter was only kicking out 300ma, so the machine was very erratic with the display going haywire. After that, with an appropriate PSU, the display was solid but it was producing junk, like random stuff - 02AF C9 as an example.. and you'd have to hit reset a bunch of times to get to the 0000s. Now after reseating things it seems to get there reliably, but zero input accepted.
I'm concerned I may have damaged it.. when I connected it to a +9V power source (which goes to a 7805 regulator of course), I had miscalculated the required amperage. The required amperage is 400ma, but the adapter was only kicking out 300ma, so the machine was very erratic with the display going haywire. After that, with an appropriate PSU, the display was solid but it was producing junk, like random stuff - 02AF C9 as an example.. and you'd have to hit reset a bunch of times to get to the 0000s. Now after reseating things it seems to get there reliably, but zero input accepted.