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On Mon, Apr 26, 2021 at 01:08:05PM -0400, Harvey White wrote:
In one of the TM5000 series function generators with an LCD display, I was
able to replace the Tek display (with an EL backlight) with a standard 2
line x 16 character off the shelf LCD display. The two displays looked
physically identical with the exception of the EL backlight, of course.
On 4/26/2021 11:44 AM, Jeff Dutky wrote:
Judging by the pictures on TekWiki those LCD displays could use replacing even when they were "working."
It looks like the LCD is getting 8-bit parallel data from the CPU with 3 address lines and read and write strobes. The display modules are only referenced using Tek part numbers (672-1241-00 below SN B023854, 118-9050-01 after), but I wonder how hard it would be to decipher that protocol. At the very least you could read the Z-80 assembly that generates the video output straight out of the ROMs.
That would be a lot easier to read with a modern LCD and backlight, or a nice, old-school gas plasma or vacuum fluorescent display.
-- Jeff Dutky
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@AuroraGrp.Com | Unix/Linux - We don't do windows