The gate array developed in cooperation with VÚMS and Tesla Rožnov (this chapter does not discuss the computer of the same name from Hewlett-Packard). The field function was defined by the last metallic layers that connected the individual elements of the "lower" lithographic structures, and this created the resulting circuit, denoted ZIO or PZIO (semi-custom integrated circuit).
The basic chip had dimensions of 7.55 x 7.25 mm and its first version was mounted in a PGA 120 ceramic package. The operating temperature range was 0–70° C. The integrated circuit required two external supply voltages (+5.0 V and +2 .4 V) as well as two groundings that were connected to increase the noise resistance up to the printed circuit board. The pins of both countries were brought out through the 8 pins of the PGA 120 case, the +5V power was brought out through the 4 pins, the +2.4V power through the 8 pins.
Input and output converters were distributed around the perimeter of the chip, the levels corresponded to the levels of the 74ALS series. There were 92 input converters on the chip, and about 64 usable output converters. A matrix of 32 columns and 34 rows was created inside the chip, i.e. a total of 1,088 cells, from which it was possible to create different types of gates. Four clock pulse amplifiers were also created on the chip for the distribution of signals with high branching.
The connection of gates and converters into a logical network was realized in two layers of metallization. At the same time, three masks were designed according to the customer: one mask for interconnection mainly in the X - direction, the second mask for interconnection mainly in the Y - direction and the third mask for interlayer interconnection. Basic functional elements such as NAND, AND, AND – OR gates, input converters, output converters and clock pulse amplifiers were available.
The main developers of the HP1000 include Eduard Kottek, Vladimír Šťastný, Jan Křivohlávek, František Kudrna and Miroslav Pěchouček.
The circuit implemented digital control in a closed loop of the servomotor for controlling the drive for paper movement in one coordinate axis or for moving a carriage with a drawing pen in the second coordinate axis of a cylindrical drawing device of format A0 to A4 type VZ 565 – CM 6426 or a cylindrical drawing device of format A3 type VZ 300. In the control of each cylindrical drawing device, the circuit was used twice – separately for each always together with control microprocessor type 8086.