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Pro-Log System 20

Posted on by Graham

Pro-Log was a major manufacturer of STD cards. The cards here arrived in a collection of almost 100 STD cards (thanks yet again, Andrew). I guessed by their appearance and dates that they probably went together, and later found that they were all related to a Pro-Log System 20.

The card cage is not the original unit but works fine. The system boots a ROM version of MS-DOS 3.2. The ROM card also has 128k of RAM for a RAM disk with provision for battery backup.

The 8088 processor card has 128k and with two additional 256k RAM cards the total system memory is 640k.

The system also includes a CGA card, floppy disk controller card, printer card, and a prototyping card.

Ampro Little Board Plus

Posted on by Graham

This is one of my current projects. It is based on the Ampro Little Board Plus which is a single board computer designed to be mounted on the back of a 5.25″ floppy disk drive.

It uses a Z80 processor running at 4MHz and includes two serial ports, one parallel port, a floppy disk controller and a SCSI controller. It runs CP/M 2.2 and is happy to boot off a floppy or hard disk. I’ve added a SCSI2SD to emulate several 20MB hard disk drives.

The user interacts with the machine using a serial terminal.

I started off with the two 40 track Mitsubishi drives shown but have been using a gotek (with FlashFloppy) for the software load.

Currently, i’m loading up a whole bunch of software from images created using cpmtools. Eventually this will be mounted in an external drive enclosure.