Qaop/JS – ZX Spectrum emulator

This is Sinclair ZX Spectrum emulator web application. Supports models 48K and 128K.

Keyboard

ESC: Menu panels
Shift: Caps Shift
Alt: Symbol Shift
Del: Reset, restart
F1: This page
F2: Remember state
F3: Recall state
F6: CRT distortion
F7: Black & white
F8: Keyboard layout
F10: Mute
Pause: Pause
PgUp/PgDn: Change volume

Tab: Extended Mode
Home: Edit
Insert: Games page
CtrlO: Open file (when paused)
CtrlS: Save file (when paused)

URL Parameters

#l=URL: Load a program (TAP, Z80, SNA, ROM, MDR) or a screen.
#t=URL: Insert tape (but do not load)
#u=URL: Load list of programs (plain text or HTML).
#48: Select Spectrum 48K.
#128: Select Spectrum 128K.
#tc2048: Select Timex TC2048.
#ay: Enable sound chip, even in 48K mode.
#kj: Emulate Kempston Joystick: 🡠, 🡣, 🡡, 🡢, and Ctrl.
#if1: Emulate Interface 1.

Parameters may be concatenated. Prefix boolean flag with ! (or ~) to turn off.

URL should point to a CORS-enabled resource (with header Access-Control-Allow-Origin).

HTTP Content-Types

application/x.zx.rom: ROM image
application/x.zx.tap: TAP tape file
application/x.zx.sna: SNA snapshot
application/x.zx.z80: Z80 snapshot
application/x.zx.mdr: Microdrive cartridge file
image/x.zx.scr: Screen dump

File format extensions

Z80 snapshots

Byte 37, bit 0	R register emulation	If reset, randomize lower 7 bits of R.
Byte 28	IFF2	0x76 indicates CPU halt.
Byte 58	Spectator flags	If one of DD, F3, FB, FD, resume execution as if after that prefix.

SNA snapshots

Byte 26, bit 6

Border

If set, enable AY.

Screenshot files

Length	Format	Notes
6144	S
6912	SA	Standard
6913	SAB
12288	SS	Timex
12289	SST	Timex
12290	SSTB	Timex

Meaning:

S: 6144 bytes in bitmap order
A: 768 bytes of attributes
B: Border colour (FE port)
T: Timex FF port

Original ZX Spectrum ROM © Amstrad PLC.
Amstrad have kindly given their permission for the redistribution of their copyrighted material but retain that copyright.