nxtp-js is a JavaScript implementation of the nxtp library, developed for the ZX Spectrum Next computer. It provides a convenient method for configuring the local time on vintage computers that possess both a Real Time Clock (RTC) and a network interface.
This library is inspired by the original nxtp project for the ZX Spectrum Next.
To use this project, you need to have Node.js version 18 or higher installed. As an alternative you can use nvm.
git clone https://github.com/syroegkin/nxtp-js.git
nvm use # if you use nvm
npm install
npm run build
npm startBy default, the library listens on port 12300. However, you can configure a different port by setting the environment variable PORT:
PORT=12500 npm startAlternatively you can use provided docker-compose file:
docker-compose up -dThere is an available pre-built Docker image that you can utilize:
docker pull ghcr.io/syroegkin/nxtp-js:latestDocker-compose uses this pre-built image by default, but if you wish, you can build it by yourself:
- Open docker-compose.yml.
- Comment out the image: line.
- Uncomment the build: line.
The public time server is available at
On your ZX Spectrum Nextr, you have the option to configure fallback servers. In the event that one server is unavailable, the system will automatically attempt to switch to a backup server.
Your autoexec.bas file may look like this:
5 REM First server
10 ON ERROR GO TO 50
20 .nxtp time.zx.in.net 12300 -z=W.EuropeStandardTime
30 ON ERROR
40 GO TO 140
45 REM Second server
50 ON ERROR GO TO 90
55 PAUSE 100
60 .nxtp time.nxtel.org 12300 -z=W.EuropeStandardTime
70 ON ERROR
80 GO TO 140
85 REM Third server
90 IN ERROR GO TO 130
95 PAUSE 100
100 .nxtp time1.zx.in.net 12300 -z=W.EuropeStandardTime
110 ON ERROR
120 GO TO 140
130 PRINT: PRINT "Can not fetch time"
140 REM the rest of the code goes here...
9997 GO TO 9999
9998 SAVE "c:/nextzxos/autoexec.bas" LINE 0
9999 ERASE
ZX Spectrum Next is a trademark of SpecNext Ltd.