Video Blog 016 - How to replace the ZX Spectrum (48K version) ROM with an EPROM
DISCLAIMER: This repair video is educational only, so if you decide to do the same yourself then you are on your own, I can't be held responsible for any problems/issues/damage/injury that may occur if you decide to follow this blog and try it yourself.
VIDEO BLOG
A short video on how to replace a Sinclair ZX Spectrum (48K version) ROM with an EPROM, and have two different ROMs available to boot from.
Parts used:
1 x 27C256 Eprom (28pin DIP, 200ns)
2 x BAT85S Schottky diode
1 x 10K resistor (1/4W)
1 x SIL socket strip (2x14-way)
1 x 2-way c/o switch (mine was from old stock so no idea of part number)
Links:
Click here for the diagrams I make reference to in the video.
Click here for the ZX Spectrum schematic diagram (Issue 3).
Click here for my own article on editing ZX BASIC files on a PC and uploading via a Spectranet interface.
Video:
