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- DC2N project update
- -------------------
- http://www.luigidifraia.com/c64/
- dc2n/index.html
-
- 01 Feb 2008
- First mount Evening: I almost finished
- the first mount after Farnell sent me
- the sockets I needed. It came out
- nicely I think. DC2N assembled by me I
- will bring this one to the HCC Show as
- well. This will give me the chance to
- test it before sending it out to the
- person who pre-ordered it.
-
- 03 Feb 2008
- Handmade box Evening: enthusiast built
- his own DC2N box.DC2N boxed by
- enthusiast looks nice, doesn't it?
-
-
- 09 Feb 2008
- New box Morning: I built the first
- version of the DC2N box. I will bring
- this one to the HCC Show.DC2N
- connected to a C64DC2N boxed by me
- That's a first go, I will hopefully
- complete it soon.
-
- 16 Feb 2008
- HCC Show Morning: I presented the DC2N
- at the HCC Show today, where I met
- quite some nice people. Many thanks to
- the organizers!
-
- 20 Feb 2008
- FAT again Evening: I compiled in and
- tested the fragmented file support
- routines of my FAT driver. A Turbotape
- (GGS) and a Cyberload TAP image (LN2)
- have been played to my C64 without
- problems.
-
- 24 Feb 2008
- Finishing the box Morning: I almost
- finished the second version of the DC2N
- box. Since I was not able to find the
- switch I need for DC2N at the local
- shop, I have to stop here for now. DC2N
- in a box Peepo has made 693 dumps so
- far! Excellent job progressing with
- mount Evening: And here it is, a DC2N
- almost fully mounted with the mode
- selector: c2n emulation or dumping
- .DC2N boxed by me
-
- 23 Mar 2008
- Happy Easter! Morning: Based on the
- custom DC2N mount SLC had done, I
- mounted my development version:
- Monitor-while-dumping DC2N I can now
- switch the DC2N mode of operation and
- adjust the datassette while dumping,
- to perform a fine tuning for those
- tapes that are hard to dump, without
- having to unplug the datasette from
- DC2N.That is, the signal is sent to my
- C64 as well, where the "Recorder
- Justage" program is kept running.
-
- The way I do that actually is as per
- below:
- load "Head Tester" (aka "Recorder
- Justage") from an SD Card to my C64
- using DC2N in C2N emulation mode
- switch DC2N into dumping mode put a
- tape in the C2N connected to DC2N and
- press PLAY align the head and rewind
- the tape to make a clean dump of it!
-
- Last update 20 Feb 2008
-
- Completed 98%
- Tested 99% (the three main features:
- PLAY, RECORD, and Dump)
-
- FAT-16 support
- read: 100%
- write: 90%
-
- I developed a hard real-time
- implementation of the FAT-16 file
- system driver. Support for
- fragmentation handling in write
- operations will be added at a later
- time.
-
- PLAYback
- legacy TAP v0 files
- support for DC2N 16-bit TAP files will
- be added
-
- RECORD and Dump
- DC2N 16-bit TAP files (counter rate is
- 2 MHz)
- TAP version 0 files (100% MTap
- compliant)
-
- DC2N TAP format
- 16-bit DC2N format generated by
- RECORD/dump operations respectively:
-
- Offset Size Description
- 0x00 12 bytes ID string:
- "DC2N-TAP-RAW"
- 0x0C 1 byte Format version: actually
- only version 0 is defined
- 0x0D 2 bytes Reserved for future needs
-
- 0x0F 1 byte Counter resolution [bit]:
- 16 actually
- 0x10 4 bytes Counter rate (LSBF) [Hz]:
- 2000000 actually
- 0x14 any 16-bit (counter resolution)
- data values (LSBF)
-
- Each data value is the delay,
- expressed in clock cycles (at Counter
- rate), between two consecutive rising
- (falling) edges of the Commodore
- computer write line (C2N read line)
- signal.0xFFFF is an overflow value,
- meaning that the next data values
- should be summed to this one to build
- up the total delay, up to the first
- non-0xFFFF value (included).
- Anyway, we don't really require to
- deal with that since the dc2nconv
- software converts DC2N 16-bit files to
- legacy TAP v1 files, which are already
- supported by many emulators and tools.
-
- DC2N TAP file resolution (2 MHz) is
- actually 16 times higher than the
- legacy TAP format (123.156 kHz).
-
- Ordering:
- The first batch of DC2Ns is being
- already shipped to large collectors
- who showed interest in having a DC2N
- quite some time ago, for preservation
- purposes. A second batch of devices is
- being processed. Delays are likely to
- occur before I will be able to work at
- the new mounts for the electronic
- components I need are out of stock at
- the supplier I used before. Even if
- people cannot yet order a DC2N until
- the abovementioned issue is solved,
- pre-ordering a DC2N for preservation
- or entertainment purposes can be done
- by writing me an email. DC2N will be
- sold on a first-come-first-served
- basis. If you think you should be on
- the pre-order list and you aren't, or
- if you are there and you don't want to
- be anymore, again email me.
-
- People who have pre-ordered so far
-
- Firstname Lastname Country
- ---------------------------------------
- Nigel Parker UK
-
- COMMODORE FREE
- ====== I have left the other list out
- if you are curious visit the website
- for details ======
-
-
- Hi Nigel,
-
- Thank you for your email. Surprising
- enough, tomorrow I will start working
- at the DC2N to send you. Anyway, I
- prefer not to give out time
- estimations to the people who
- pre-ordered. I would have contacted
- you when the first build had been
- completed and tested properly On
- average, it takes three weekends to be
- built. Sorry about that, but I have no
- help with this and no professional
- tools. I may actually be able to do it
- sooner for this would be my third
- build. I had built one that I meant to
- sell out, but it's now part of my test
- bed due to some constraints I met
- recently (a huge collection of tapes
- to image with one device while
- developing using the other device).
-
- Next Project
- My next coming hardware project is
- D1541 which I would also refer to as
- "True 1541". Surprisingly enough
- there's no 1541 replacement that
- actually satisfies my requirements, so
- that I am going to fill this gap by
- myself. It's going to be all but a
- quick project, even if I know I will
- get there. My aim is to go beyond D64
- and G64 formats to support all of the
- copy protected disks in one go.
-
-