Difference between revisions of "Httpd-ack"

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|name=httpd-ack
 
|name=httpd-ack
 
|genre=Tool, Utility
 
|genre=Tool, Utility
|release_date= Jul 7, 2018
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|release_date= Jul 11, 2008
 
|unreleased=No
 
|unreleased=No
 
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Latest revision as of 17:28, 10 June 2020

Title Screen
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

Source

gotwalls.com

Historical builds