This ROM image is compatible with Kickstart 2.04 (and later). It was released as a mask ROM with part number 391298-01 and date code 9238 for use in the A570 CD peripheral, which allowed the Amiga 500 to act like a CDTV.

Common features of CDTV and A570 extended ROMs:

• All CDTV "extended" roms are more or less identical, the only difference is the included module versions.
• CDTV "extended" ROMs are a bit special (compared to CD32), they take over the boot phase (has $1111 identifier + jump address at the beginning which KS ROM checks very early and if $1111 is detected, it jumps to this ROM).
• CDTV ROMs also have updated exec.library (34.1001) which replaces the one in the main ROM. This is the reason for CDTV 1.0 ROM KS 2.0+ incompatibility: exec is replaced with older version, also it seems to include utility.library which is normally KS 2.0+ only.

Differences between this 2.30 version and the previous 2.7 version:

• cdtv.device updated from 35.12 to 35.14
• bookmark.device updated from 6.6 to 6.7
• cdstrap updated from 9.7 to 9.17
• kludges 37.11 added (compatibility patches to address issued affecting known titles)
• A690 ID added (no code, just an "identity" resident)

Differences between the A570 versions (2.30) and the CDTV versions (1.0, 2.7, 2.30):

• The A570 versions require DF0: to be present, whereas the CDTV versions check for the presence of a floppy drive and set a flag telling if a floppy drive was found or not
• Because of the above, an A570 ROM used on a CDTV system (without floppy drive) will display a "red screen" error