This system was purchased in November 2013 for $200 (plus about $35 shipping). The reason for this purchase, was the replaced CPU board. Instead of the standard Heath CPU board, this system has the TMSI H-1000, which has both the 8-bit Z-80 and 16-bit 8086 CPUsto run both 8-bit and 16-bit software.
This system was also EXTREMELY well packed. They used double boxing, to insure the system did not directly feel shipping impacts. The H89 itself was wrapped in large bubble wrap. Even though this system has the original, poorly constructed CRT mounts, none of them broke during shipping.
I've only spent about 20 minutes with this system. The system only beeps once, and it doesn't seem to respond to any keyboard presses (either on-line or off-line). The voltages seemed fine. Nothing appears on the screen, I've tried turning the brightness knob (this system did not have the external knob, but it was only on the video card under the CRT), and still did not see anything, not even a blinking cursor.
This system has the TMSI H-1000 CPU board and a bunch of push buttons. I'm not sure what they do.
Need to determine why there is no video, and then verify operation.