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RetroLoader128 V0.5   [2021]

RetroLoader128 V0.5 Released by :
Retrocomputacion [web]

Release Date :
29 August 2021

Type :
C128 Release

AKA :
RL128

Website :
http://www.pastbytes.com/retroloader

User rating:awaiting 8 votes (6 left)   See votestatistics

Credits :
Code .... Pastbytes of Retrocomputacion
Design .... Pastbytes of Retrocomputacion
Idea .... Pastbytes of Retrocomputacion

Download :
http://csdb.dk/getinternalfile.php/217539/retroloader0.5.zip (downloads: 73)

Look for downloads on external sites:
 Pokefinder.org


Production Info
Submitted by pastbytes on 5 September 2021
Once a PRG is selected, it is loaded into bank 1 at the same address as it would be in C64 mode. This avoids conflicts due to differences between the memory maps of the C64 and C128 modes. The maximum size that a PRG can have is almost 62K, since it is loaded into a memory bank where there is only RAM, so there are no conflicts with ROMs and I/O.
Once the PRG is loaded, a routine is copied to the C64-mode cassette buffer ($033C). This is a point of no return to C128 mode, since it destroys the system variables.
The code in $033C copies the PRG from bank 1 to bank 0 (overwriting the browser code), configures the MMU to go to C64 mode without transferring control to the system, configures the system variables to "simulate" that we just finished loading a program using LOAD on a newly initialized C64, it places 'RUN' + RETURN into the keyboard buffer, and transfers control to BASIC 2.0.
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