cpctelera : startaddress is 0x0100 ?

[funkheld]

Hi good afternoon.


im wondering that the starting address at cpctelera can be so low. Why ?
normally you can only start at 0x4000.


greeting


spritedemo:
------------------------------------
PROJNAME   := sprites
Z80CODELOC := 0x0100
------------------------------------

[ervin]

Most cpctelera programs disable the firmware. Cpctelera has a command to do this. Disabling the firmware allows us to use the ram before 0x4000.

[funkheld]

which system commands can then no longer be used?




greeting

[awergh]

which system commands can then no longer be used?

Have a look at the cpctelera documentation.
https://lronaldo.github.io/cpctelera/files/readme-txt.html


For example in cpct_drawStringM0 provides a warning:
Do not put this function's code below 0x4000 in memory.  In order to read characters from ROM, this function enables Lower ROM (which is located 0x0000-0x3FFF), so CPU would read code from ROM instead of RAM in first bank, effectively shadowing this piece of code.  This would lead to undefined results (typically program would hang or crash).