PC 88

Designed by Ing. Roman Kišš.It was manufactured from 1987 by Tesla Piešťany. The computer was inspired by or was successor to IBM 5150. Hardware is based on i8088.

Parts of this topic may be machine translated.

The computer did not get into the production, only a 200-piece series for internal use.

The PC-88 peripheral solution is 250x285 mm on one area of ​​250x285 mm, with 131 integrated circuits. The surface plate is designed by the surface wire method (Multiwire) and the plate represents a six layer of a classic flat plate. It contains a RAM with a capacity of 256 K8, from which they can define up to 64 KB and 8 kB of ROM for video pages, which is system firmware - BIOS. There is also a discrete video processor for RGB monitor, 5,25 "(minifloppy) disk for four drives, timer 8253, interruptions system, interfections for printer and keyboard with detailed circuits, and three local buses for system extension. The view of the whole system is realized similarly to IBM PC / XT.

Parameters

• 8 /16 -bit processor 8088
• 1 hour frequency of 4MHz
• RAM RAM 256 KB (expandable)
• Memory ROM 8 KB (BIOS)
• Video memory 64 KB with alphanumeric output 80/40 x 25 characters and graphic 640/320 x 200 pixels
• 5-level interruption system
• Acoustic programmable (8253) output
• Separate 85-Prvká keyboard
• built -in power supply + 5V / 8A; 12V / 1, 5a
• Built -in 1 (2) Minifloppy disk drive with capacity each 180 (360) KB
• Local Bus to Extensions (three modules)
• Centronics interface for printer output

BIOS firmware with 8 kB range includes procedures for diagnostics, video, disk, printer, timer, interfections RS 232 System from Minifloppy Disk Unit. These procedures are created so that even in a qualitatively different peripheral architecture they are most compatible with IBM BIOS.

References

• https://www.retromania.sk/cs/letopocet-1980-1989/osobni-pocitac-tesla-pc-88 (WebArchive)
• KIŠŠ, Roman a STRÁNSKÝ, Martin. Osobní mikropočítač PC-88. Basic Input Output System. Piešťany: Tesla, 1988.