BASIC source for the Seiko PC Datagraph sync software for IBM PC
Run with GWBASIC.EXE RC4000.BAS /C:2048
Archived with more details here https://archive.org/details/seiko-pc-datagraph-rc-4000
Converted to ASCII format by loading into GWBASIC and re-saving based on Microsoft KB 72502 https://hwiegman.home.xs4all.nl/msdos/72502.htm
Tested using a copy of GWBASIC from https://hwiegman.home.xs4all.nl/gwbasic.html