This README file for ZX, emulator of ZX Spectrum on IBM PC compatible
running DOS 3.3+.

Program ZX fully emulates Z80 processor and some hardware attached to
the Spectrum - printer on EPSON printers (graphical output) and tape
of floppy/harddisk.

Program is made to be as fast as possible, so many dirty trick are used
te get best performance. E.G. there is no main loop for emulating
instructions - so there's no way how to slow down emulation except of
turn off `TURBO MODE' of processor. Average of emulation: 4.5 i80x86
instructions emulate 1 Z80 instruction (including all overhead).
In fact, on 16MHz AT/286 got the same speed (in average) as the original
ZX Spectrum.

Full ZX coloring scheme is emulated on EGA/VGA. PC video card is
set to a bit nonstandard mode 256x192 or to 320x192 - emulated screen
and tape display together. Do not expect, that this emulation can be run
in other environment than pure DOS in real mode. In addition,  EGA/VGA
writing mode differs from the mode used in DOS - so this is next possible
source of incompatibity.

Tape is emulated in the fd/hd directory. There is a file TAPEDIR, which
contains information about ZX files in the directory. TM.EXE is the utility
for maintaining tape emulation including copying, renaming, sorting etc.
This TAPEDIR file is not mandatory - can be simply restored using TM.EXE.
BASIC LOAD/SAVE commands are emulated to work with this environment.

Keyboard is emulated on port I/O level in two modes - PC and ZX. ZX mode
is `direct' mode - keycliks are simply passed to emulated Z80 i/o ports.
PC mode gives you translation of most PC keys - like quotes, numpad keys
and so on as a key-combination on `original' keyboard.

Running program have `online help' ;-) on F1 key - there is a picture
of original ZX keyboard with keywords and description of program hotkeys.

This program is freeware - you are using it at your own risk - but if you
really like like it, send $1 to us.

Eduard Rindt            Ludek Brukner
ert@regionet.cz         lubr@regionet.cz