Atari 130XE Manual do Utilizador descarregar pdf (Página 22)

2 Usage

2.3.1 Adapting the boot disk loader

When a frozen program is saved as boot disk, the freezer also writes a loader to the disk.

This inherently will not work with every program because the loader itself requires about

2k of memory. If the frozen program requires already the complete memory of the Atari,

it will not work together with the loader.

By default the loader uses the area between $C000 and $C6FF. This normally guarantees

correct operation with all programs that only require 48k of memory. The start address of

the loader can be adapted easily in case a program still runs into problems.

The ﬁrst byte of the boot sector contains the start page of the loader (by default $C0).

Adapting this byte is very easy with the

TURBO FREEZER

. Start the debugger, load

the ﬁrst sector, change the byte to the desired value and write the sector back to the disk.

Please note that only values from $05 to $C9 and from $D8 to $F9 are allowed. If you use

other values, you will obtain a

BOOT ERROR

when booting the disk. The following sequence

of commands can be entered in the debugger to adapt the start page of the loader for

example to $F0:

SR 1

C D700<F0

SW 1

2.3.2 Freezing a program that loads parts later

Freezing programs that load parts later is of course always possible. The only thing to

remember is that the original disk must be inserted into the disk drive after resuming

the program and before any further operation is performed in the running program. This

of course wears out the disk over time. Therefore it is desirable to have a backup disk

at hand so the original disk can be locked away in a safe location. But even with ﬂoppy

speeders that include a copy function not all new programs can be copied by far.

The

TURBO FREEZER

does not remove the copy protection from the original disk, it

only saves the current program state. In order to resume from this state later as often

as you like, the original copy protected disk must be inserted into the disk drive again,

before the program is resumed. If you use an additional disk to save the frozen game state,

the original disk should be equipped with a write protection. This prevents accidentally

overwriting the original disk.

If the game loads additional parts from multiple disks without copy protection (

e. g.

adventure), it is advisable to copy these disks and use the copies instead to not wear the

original disks out.

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