New Acquisitions, H8 Question

One of my favorite activities is checking out swapmeets, swapfests, etc. Because a number of people know about my addiction and are willing to help out, I just picked up the following for about $125: 2 - Model 100's w/ cassette recorder, cases, manuals, etc. 1 - HP 85 w/ 128K Ram Pack and Plotter Rom (one more left I didn't take) 1 - Mac Portable (works but dead HD) 1 - Tandy 1400 portable 1 - Kaypro ? w/case 1 - Heathkit H?? (like the Z89) 1 - Heathkit Dual Floppy 1 - Heathkit H-8 w/ H17 dual Floppy Drive When I took a look at the H8, it turned out to have a D-G Electronic Development CPU and memory card. I haven't taken the time yet to check out the other cards to see if they are Heathkit or other 2nd source cards. Besides the floppy controller, there are two cards marked H8-4 and H8-5. The H8-4 is a multi I/O card, and I have no idea what the H8-5 is yet except that it has what appear to be audio cables coming from the card. I am not familiar with D-G Electronic Development and am looking for more information about them. Unfortunately, no documentation came with the units BUT I will be trying to find out where they came from and see if the people who donated them have anything else that might go with the computers. While I won't be doing much with them at this time, I would appreciate any information on those D-G cards. Thanks!