On File Database Management System was released in June 2024 by KSL in order to celebrate the anniversaries of CPC (40 years!) and CP/M-80 (50 years!). On File is a business application similar to the MSDOS-era PC applications and one of the most recent (2024) projects developed for CP/M.
On File database is disk-based, quick and reliable. It uses the entire CPC screen as the platform for the records; thus there is plenty of space to store large amount of data. Setting up a new database using On File is very easy: 1) start the new file system by resetting the database and the master record, 2) frame/draw and edit the structure of the master record, 3) append new records on the basis of the master record. The database can be either flat or relational. Children records include the ^ symbol followed by the relational key and one space, for example ^Z80 . Parent records include the relational key (not the ^ symbol) followed by one space, for example Z80 . If a record contains more than one relational key, the key at the lowest field is set as the active key. Every record has its own unique filename, stored in the disk drive. On File capacity is 200 records (equal to 400 KB), it is thus an ideal application for the 20 MB Dobbertin Harddisc which supports up to 512 file entries.
As per Cosmos, On File has been developed on the basis of the hardware peripherals as well as the software that were (contemporary) available for the CP/M and the CPC6128: the 512 KB Dobbertin Memory Expansion, the ParaDOS or X-DDOS ROMS for the external (800 KB) floppy drive, the 20 MB Dobbertin Harddisc, the Amstrad Serial Interface, the Amstrad Parallel Printer Port, the CTM640/CTM644 colour monitor, the AMX Mouse, the MicroScript (142 KB), the WordStar (706 KB), the Protext (406 KB), the Multiplan (208 KB), the SuperCalc 2 (240 KB), the dBase II (272 KB), the DR Draw (235 KB), the DR Graph (306 KB), the MAXAM (206 KB), the Atlast Plus (224 KB) and other Programming software. On File includes a graphics screen saver, is based on the Dobbertin version of CP/M 2.2 (v1.2) which provides 59 KB TPA, supports the RAM expansion and the 20 MB hard disk. The original disk contains some demo master records (*.002 files) as well as the boot sectors for CP/M 2.2 (v1.2)