It's time to take the plunge into digital. Hailing from an ugly era of electronics: the fuschia script Applied Research & Technology DR-X.
On initial power up all I got was LCD backlighting, no character display or response from buttons. I've seen this symptom occur before in power starved conditions, which is easy enough to troubleshoot with a voltmeter. A day later, before I cracked the case on this unit I wanted to to get a picture of it. Naturally, that symptom went away and gibberish replaced it.
This hints at failure of back-up battery to me, probably coupled with power delivery issues that may be as easy a fix as redressing the interior wiring connectors. One thing has always bugged me about these gibberish displays, that I cannot recreate the character strings on an operational unit.
Circa 1990 through hole digital construction. Judging from the chipset the upper PCB looks to support the analog signal path while the larger board is populated with digital ICs.
A closer look at the PCB reveals what appears to be caustic potash (potassium hydroxide / electrolyte) corrosion simulating snow drifts at the legs of the ICs, indicating that this unit needs a little more help than replacing the backup battery and exercising the ribbon cables. Thankfully this unit is disassembled with ease, so washing the PCB will be a snap.
After which it's probably looking at a re-cap.