I'm trying to make a dot matrix message board -type thing work,
The dot matrix IC's are the DL-57 Alpha Numeric Dot Matrix Display [Data Sheet] : https://drive.google.com/file/d/0B6Pibr6_2jwcQ2xmRUIwTjFBZ0k/edit?usp=sharing
Which is pretty simple as you can see, hwoever the hard part comes in where I want the message to be configurable, not on the fly though.
I know I need some kind of ROM, and the one I have right now is the M27C256B, it's a UV EPROM (Data sheet shown here : http://pdf.datasheetarchive.com/datasheetsmain/Datasheets-20/DSA-394559.pdf)
Erasing it is no problem, obviously, but programmers are mega expensive, I did google for some DIY programmers, but the only ones that I could find were in a google cache.
Is there any other way to make a sort-of-ROM-thing with other IC's? Or maybe I overlooked some DIY EPROM programmer?
Any help would be appreciated.
(I also have a UV EPLD : EP900 DC-3 3F19007 (datasheet available but I already have two links in here) , but again the problem is programming the thing....)
Any help would be welcomed, I do have a large stock room of TONS of parts, so please, if you have some kind of schematic for building a programmer, that would be much appreciated.