Informer Z80 Microcomputer
In West Liberty, Iowa a company called Digital Sports Systems built the next step up from the Altair. It had the Zilog Z80 8 bit CPU with the S100 bus. It used 4k dynamic rams and could address 64k of memory. The system supported 2 floppy disk drives - 32 hard sectored disks that held 300k bytes each. I automated my auto parts stores billing with them. Peachtree accounting written in basic with microsoft's ISAM - indexed sequential access management - handled the data files. The OS was CPM - comtrol program for microcomputer by Digital Research. This was the OS that MS emulated for IBM when they wrote PC-DOS. At the time we did not realize that MS writing the DOS for IBM would make Bill G the richest man on earth even though he had to brake a few restraint of trade laws to do it. One is not going to go from nothing to multibillion by just being competive. At least now he is giving some of it away for good causes.
I noticed the first listing called the Altair the first personal computer. We didn't learn the term 'personal computer' until several years later when IBM used it to differentiate the micro based computers from their real computers. Until the 16bit world it was microcomputer.
