The ISOT A505E 5.25" control diskette is used to adjust some parameters of the 5.25" floppy disk drives ISOT 5050 (ES 5088) or any other compatible floppy disk drives. It is used to perform radial adjustment of the read head and tangential adjustment of the index detector.

Russian language brochure of the professional computers line of ISOT, exported to soviet market by ISOTIMPEX.
The following models are pesented: ISOT 1031S (SM 1901), ISOT 1036 (ES 1831) and ISOT (ES 1832),as well as the company local area network 'ISOTRING', based on ISOT 8502S communication adapter.

Bulgarian Chess compter 'PARTNER' made by 'Software Products and Systems' It is based on 3MHz 65C02 CPU and has 16kB ROM and 2kB RAM. The gameplay could have 9 levels of difficulty. A problem solving mode with 3 level of difficulty is also available.

I have started collecting data about bulgarian made expansion cards for Pravetz 82 and compatible computers. The goal is to prepare a catalog with the revisions of each card, photos, and where necessary - information about connecting and using the card.

The new addition to the collection is a "TEHNOHARD & CHISLER" computer. It was assembled by a Plovdiv based company with parts from Pravetz factory. The case holds a Pravetz 8A mother board, power supply, 5.25" floppy drive and floppy controller. The stand alone keyboard is probably a Pravetz 8C one, put in case of Pravetz 16 keyboard. The system is hardware and software compatible with Apple IIe.