sprites like MJ's Trabajo Basura (not unregr. Fourspriter)

[britlion]

The C header file 'spectrum-sp1.h' lists all the sp1 functions and data structure definitions. I am not sure if Boriel's basic has the equivalent of a struct or pointer to a struct? but something like that is necessary.

Nope. Not even that much of proto-object oriented programming. More or less Sinclair Basic and raw assembly only - or any library subroutines that can be made from that.