GSX

GSX is the standard graphics library for CP/M.

GSX consists of:

GENGRAF.COM - This takes a .COM file and configures it for use with GSX. The resulting .COM file can be run without GENGRAF.COM and launches GSX before running your code.

ASSIGN.SYS - This is a text file which contains the mapping of devices to driver files that implement them.

DDMODE0.PRL - An example of a driver.

GSX.SYS - The device independent part of GSX.

Drivers and ASSIGN.SYS

Vendors provided platform specific drivers which implemented GSX.

Amstrad/Locomotive provided DDMODE0.PRL, DDMODE1.PRL and DDMODE2.PRL which implement drivers for each of the CPC's screen modes.

ASSIGN.SYS is a text file which must exist along side gsx.sys and which contains the mapping of device id to the driver that implements that GSX device. When you program GSX you open a device by it's id.

Example content of ASSIGN.SYS

01 @:DDMODE0.PRL