Kay 1024 Explained

Type:	Home computer
Cpu:	Zilog Z80A
Cpuspeed:	3.5 or 7 MHz
Memory:	1024 KB
Os:	TR-DOS
Display:	RGB monitor/ TV out; 256x192
Developer:	NEMO
Compatibility:	ZX Spectrum
Sound:	Beeper, AY-3-8910

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

The Kay 2010 or Kay 1024/SL4 is a 2010 update of the original KAY 1024 with a few minor additions and improvements.^[10] 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.

Notes and References

1. Web site: KAY Nemo Documentation . speccy4ever.
2. Book: KAY 1024 Schematic . NEMO . 2000.
3. News: Szczepaniak . John . April 2005 . Global Gaming . 2 . 78–80 . Retro Gamer . 3 .
4. Web site: ZpiXel . GFXZone . January 2002 . ZX-Spectrum graphics modes . ZpiXel ZX Spectrum Scene Graphics.
5. Web site: KAY 1024. Руководство по эксплуатации . ZXPRESS — Журналы, газеты и книги для ZX Spectrum.
6. Web site: Nemo . ZX Spectrum demo Kay 1024 Information . AAA presents: ZX Spectrum Demos.
7. Web site: Sinclair – Nachbauten . 2022-12-30 . 8Bit-Museum.de.
8. Web site: KAY-1024 . ZX - Spectrum REAL HARDWARE MUST LIVE !.
9. Web site: KAY . 2023-01-30 . SpeccyWiki.
10. Web site: KAY-2010 . 2023-01-30 . SpeccyWiki.