Kay 1024

The Kay 1024  was a Russian ZX Spectrum clone introduced in 1998. Created by the NEMO company of St. Petersburg, it has 1024 KB of RAM. It was a rival to Scorpion ZS 256, having a slightly lower price. It offered a controller for a PC keyboard and HDD, but not for floppy disks (although available as an extension card). Adding a General Sound card was easy, and the CPU had a 7 Mhz turbo mode.

Earlier versions of the machine were known as Kay 128 and Kay 256. 

The Kay 2006 NB (North Bridge) is a 2006 version based on the Altera EPM7064 MAX. It adds three new graphics modes: Multicolor, GigaScreen and 512×192 pixels in 2 colors. 

The Kay 2010 or Kay 1024/SL4 is a 2010 update of the original KAY 1024 with a few minor additions and improvements.  The Kay 2010 mainboards are manufactured in Chelyabinsk. 

Specifications
Brief technical specifications of KAY-1024 computer:


 * Supplied as a complete board, with a IS-DOS floppy disk, drivers and utilities, a ribbon cable and instructions (on a single sheet of paper). A 40 MB hard drive with the preinstalled operating system was an option.
 * 1024 Kb RAM (61 pages), usable as 256 Kb (7FFD 1FFD) plus a 640 Kb RAM disk in TR-DOS (virtual drive "C").
 * The Z80A 3.5 MHz CPU has no wait states and a 7 MHz turbo-mode. The turbo mode can be controlled by software, logical level on bus, or by an external button.
 * KAY-1024/3SL/TURBO motherboard with three slots for additional devices: floppy disk controller, IDE drive, IBM PC keyboard, modem, etc (no soldering needed).
 * Built-in hard drive support in ROM. IS-DOS may be loaded directly from hard drive, accessible from the computer main menu.
 * The IDE hard drive interface for Nemo-bus and IS-DOS can be used within TR-DOS.
 * IBM PC keyboard and mouse controller (Kempston mouse).
 * XTR-Modem, for Nemo-bus.
 * 5.25″ and 3.5″ disk drives.
 * "BETA-TURBO" floppy disk controller for Nemo-Bus.
 * Optional: AY-3-8910, Z84C0010PEC, Z84006PEC, ROM 27C512 with KAY-1024 ROM set, real-time clock IC "Dallas", ribbon cables for HDD and FDD; General Sound external sound card, Nemo-bus compatible; General Sound memory module.
 * Kempston and Sinclair joysticks.
 * Complete Centronics printer interface.