DRAM 128K system has stopped working

[ChickenMan]

A GQ-4x4 Eprom Programmer will read and burn all varieties of Microbee EPROMs from 2716 to 27128 as well as 2532's, including 12v and 25v varieties. I have one of these and works from Windows XP to Windows 11.  I can always burn you out an EPROM, just PM me what your after or grab one of these off eBay - GQ-4X v4 USB Programmer Eprom Chip Burner GQ-4X4 BIOS Flash PIC AVR SPI I2C | eBay

All the BN54 eproms are "proper", the bn54_2732 doesnt have the Networking part, the bn5442 was the original issue while bn5443 has updated Networking (43) code.  Most found in the wild labelled as bn54 are the bn5443 variety.