Kay 1024

The Kay 1024[1][2][3] was a Russian ZX Spectrum clone introduced in 1998.[4][5][6] Created by the NEMO[7][8] company of St. Petersburg, it has 1024 KB of RAM.[5] 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.

Kay 1024
DeveloperNEMO
TypeHome computer
Release date1998 (1998)
Operating systemTR-DOS
CPUZilog Z80A @ 3.5 or 7 MHz
Memory1024 KB
DisplayRGB monitor/ TV out; 256x192
SoundBeeper, AY-3-8910
Backward
compatibility		ZX Spectrum

Earlier versions of the machine were known as Kay 128 and Kay 256.[8][9]

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.[8]

The Kay 2010 or Kay 1024/SL4 is a 2010 update of the original KAY 1024 with a few minor additions and improvements.[8][10] The Kay 2010 mainboards are manufactured in Chelyabinsk.[8][10]

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.

References
  1. "KAY Nemo Documentation". speccy4ever.
  2. KAY 1024 Schematic (PDF). NEMO. 2000.
  3. Szczepaniak, John (April 2005). "Global Gaming". Retro Gamer. Vol. 2, no. 3. pp. 78–80.
  4. ZpiXel; GFXZone (January 2002). "ZX-Spectrum graphics modes". ZpiXel ZX Spectrum Scene Graphics.
  5. "KAY-1024". ZX - Spectrum REAL HARDWARE MUST LIVE !.
  6. "KAY 1024. Руководство по эксплуатации". ZXPRESS — Журналы, газеты и книги для ZX Spectrum.
  7. Nemo. "ZX Spectrum demo Kay 1024 Information". AAA presents: ZX Spectrum Demos.
  8. "Sinclair – Nachbauten". 8Bit-Museum.de. Retrieved 2022-12-30.
  9. "KAY". SpeccyWiki. Retrieved 2023-01-30.
  10. "KAY-2010". SpeccyWiki. Retrieved 2023-01-30.
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