New Transducers TR-5001 - Manual (Page 95)

C. POST Beep
Currently there are two kinds of beep codes in BIOS. This code
indicates that a video error has occurred and the BIOS cannot
initialize the video screen to display any additional information.
This beep code consists of a single long beep followed by two short
beeps.
The other code indicates that your DRAM error has occurred. This
beep code consists of a single long beep repeatedly.
91 TR-5001 User Manual