Httpd-ack

Httpd-ack

Released by ackmed (at) gotwalls.com Name httpd-ack Genre Tool, Utility Release date Jul 11, 2008

Download Httpd-ack (info)

httpd-ack is software written for the Dreamcast to dump GD-ROMs via a Broadband Adapter link.

Usage

• Assign a static IP to your Broadband Adapter using a web browser like XDP or Broadband Passport.
• Burn the CDI image to a disc and boot the Dreamcast. Alternatively, boot the Dreamcast using dcload-ip and load the elf file with dc-tool:

dc-tool -t <dreamcast ip> -n -x httpd-ack.elf

On a PC connected to the same network as the Dreamcast, load a web browser and enter the Dreamcast IP in the URL bar. A menu interface will appear that will allow you to dump tracks from the GD-ROM by clicking a track to "download" it via your browser. By modifying the parameters of the links given to each track, you can manipulate the dumping options:

Dumping Parameters

Option	Description
track%d	dump track %d (or end sector if >= 100)
session%d	dump session %d (or start sector if >= 100)
ipbintoc%s	1 = use cdrom TOC thats in IP.BIN for session 2 0 = use cdrom's TOC (this option is useful for dumping GD-Rs with swap trick)
p%d	unknown param when initializing the cdrom. 8192 and 4096 seem to be valid numbers. 8192 for data, 4096 for audio?
cdxa%d	something to do with cdxa. 0, 1024, 2048 seem to be valid numbers. 1024 for data, 0 for audio?
sector_size%d	what sector size to initial the cdrom with for reading. 2048 or 2352 are valid. 2352 doesnt always seem to stick and somehow depends on p and cdxa values.
gap%d	the end sector for tracks is unknown (except for the last track in a session). so the end sector is calculated by ((start sector of next track - 1) - gap%d).
dma%d	1 = use dma when transfering from cdrom 0 = use pio
sector_read%d	number of sectors to read in each cdrom_read_sectors() call, max 128
sub%d	0 = dont dump sub channel 1 = use syscall method to dump sub channel 2 = use cdrom_read_sectors method to dump sub channel (dma will be forced to 0, sector_read will be forced to 1)
abort%d	1 = abort on read error 0 = continue on read error
retry%d	if cdrom_read_sectors() call returns an error, the number of times to retry before giving up

Automating dumping

As only one track may be dumped at a time, and the user must sit at the web browser to start dumping the next track, it is recommended to use a script to automate the dumping process if a large number of GD-ROMs will be dumped. A script that can be run on Windows 10, macOS, or Linux is available.

GD-R dumping

It is possible to make httpd-ack use the TOC from the IP.BIN at sector 45000 for session 2. The ability to do this is to assist in making it possible to dump GD-R media using a swap disc method, as otherwise the TOC from the old disc would be used when swapping discs with the lid detection switch held down.

http://IP/?ipbintoc

or

http://IP/index.html?ipbintoc

The following entry will be logged to the video output to indicate the software is using the TOC from the IP.BIN:

get_toc(): using ip.bin for TOC

Dumping a sector range

track%d and session%d have a dual meaning. If both are >= 100, the value of session%d will act as the start sector, and track%d the end sector, and instead of returning an entire track for download, the software will return a file only containing the specific sector range (session%d through track%d).

Screenshots

• 

  Title screen

Source

gotwalls.com

Historical builds

• httpd-ack 20080711 elf + cdi
• httpd-ack 20071123 elf + cdi
• httpd-ack 20070720 elf + cdi
• httpd-ack gdr-test BETA 3 from 20070626 elf only
• httpd-ack gdr-test BETA 2 from 20070626 elf only
• httpd-ack gdr-test BETA 1 from 20070625 elf only
• httpd-ack 20070624 elf only
• httpd-ack 20070511 elf + cdi
• httpd-ack 20070430 elf + cdi