This is ELoad, a fast loader library for various Commodore 64/128 drives.
EasyFlash website: https://skoe.de/easyflash/
Official repository and issue tracker: https://gitlab.com/easyflash/eload/
Other EasyFlash related repositories: https://gitlab.com/easyflash/
Source repository mirror: https://github.com/easyflash-mirror/eload/
(C) Thomas 'skoe' Giesel
Refer to LICENSE.md.
Memory map for 1541:
| Address | Usage |
|---|---|
| $0000 | ZP |
| $0100 | Stack |
| $0300 $0400 |
drive_code_1541 (init and xfer) drive_code_1541 (common code) |
| $0500 $0600 |
drive_code_1541_read or write |
| $0700 | buffer |
drive_code_init_size_1541 bytes at drive_code_1541 are uploaded using the
KERNAL transfer functions to $0300. This is 256 bytes or less. When this
code runs, it loads 512 bytes using the fast protocol to $0300. Note that
the init code is overwritten with the same code again in this phase.
Next it loads 512 bytes overlay code to $0500 and calls it with JSR.
Each time the overlay code returns with RTS, motor and LED are switched
off and the transfer and start of the 2 blocks of overlay code is repeated.
Note that the motor deactivation is delayed with a timer, this is implemented
in DOS.
The overlay code waits for eload job codes. Job code 0 leaves the overlay code (RTS).
TODO