General info for: DB1 [#ID: 11645]
Title:
Also known as:
DB1 +3 Disc Backup Utility
DB1 Plus 3 Disc Backup Utility
DB1 Plus 3 Disc Backup Utility
Release Date:
1988
Original Publisher:
Creators:
Availability:
Available
Message Language:
English
Machine Type:
ZX-Spectrum 128 +3
Genre:
Maximum Players:
1
Groups:
Original Price:
£12.95
Disk Price:
£12.95
Remarks:
The .dsk image below doesn't work in all emulators, due to the copy protection. In those cases:
Firstly, the disk has to be set to auto-load. If the disk is loaded by pressing Enter for Load on the +3 start-up menu then it won't work, as the I-register will be set to $3F and the decryption routine will give the wrong result. With auto-load set the I-register will be set to $00 and the code will decrypt correctly.
Secondly, set a break at $8BE2: LD SP,$8000; step through that command then skip over the next two CALLs and jump straight to the $8BEB: DI command, then Run and the DB1 start-up screen will be ready to use. I presume that the first CALL is the copy protection, as if it returns NZ (which it does) it makes the second CALL which erases all the memory and does a reset.
Firstly, the disk has to be set to auto-load. If the disk is loaded by pressing Enter for Load on the +3 start-up menu then it won't work, as the I-register will be set to $3F and the decryption routine will give the wrong result. With auto-load set the I-register will be set to $00 and the code will decrypt correctly.
Secondly, set a break at $8BE2: LD SP,$8000; step through that command then skip over the next two CALLs and jump straight to the $8BEB: DI command, then Run and the DB1 start-up screen will be ready to use. I presume that the first CALL is the copy protection, as if it returns NZ (which it does) it makes the second CALL which erases all the memory and does a reset.
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