Hardware > Hardware (Classic 16-/32-Bit)

DIY Falcon Beschleuniger von Peter Green

<< < (15/19) > >>

Arthur:
Ich habe hier noch einen Bericht von Richard Elwell zum Clockpatch gefunden bei Verwendung des Afterburners 040 der ganz interessant ist. Dann dachte ich noch an Ingos Tipp statt eines 74F04, 74F08 einen Bustreiber zunehmen. Bringt es vielleicht noch irgendwelche Vorteile wenn das Taktsignal, das ja aufgeteilt wird, nicht nur von einem Gatter getrieben wird?


--- Zitat von: http://www.stcarchiv.de/atariphile/03_ab.php#performance ---Clock Patch

The big stumbling block was the requirement of a ’clock patch’ which had to be fitted. This is needed due to those helpful people at Atari cutting corners and giving us owners problems. From what I have been told parts of the Falcon board are almost useless. Junctions and resistors are in places that really don’t need them and, but for the addition of a simple component, a set of signals supplied are rather weak. Basically a 16MHz signal is generated for the system to use. This signal is split into three for various parts of the board. Resistors are used to prevent bouncing signals merging together and giving an unreliable signal. This all combines to give a signal that most of the time is OK but if you are doing direct-to-disk recording and/or using fast SCSI devices or fitting an acceleraator board the weakness of the signal can cause corruption. The clock patch boosts this signal. All C-Lab Falcons have this fitted and many of you will have one installed already. You lucky people.

There are several variations of the clock patch all achieving the same goal. There are diagrams of two different methods in the manual, the German descriptions for which were almost imponderable. Did it matter which one I used? Did it depend on the revision version of my Falcon? Hhheeelllppp!

David Encill at Titan Designs put me in touch with someone who knew what they were doing and he pointed me in the right direction. I got my Falcon going without the patch and he E-mailled me a couple of diagrams and some instructions, all in English. An additional chip needs to be purchased, the 74F04, it is a hex-inverter. Pins on this need to be connected with various points on the board, most of which are on one particular chip. It took me several goes to get it running but eventually it did.

With the various wires and the chip I’d soldered I was a little concerned that a bare wire may come into contact with the bottom of the Afterburner. If you piggy-back the 74F04 onto the relevant chip the Afterburner will almost be resting on it if plugged in firmly. To prevent any short circuits I sellotaped a piece of thin cardboard to the bottom of the Afterburner.

Without the clock-patch I found the Falcon was very unstable, which is to be expected. Crashes could happen at any time and even booting up became a problem. Using a 2 colour resolution enabled me to get a reasonable level of stability. While trying to buy some 74F04s it spent nearly a week without the clock patch. It was used very little during this time but with no problems. My main worry was file corruption and consequent possible hard drive data damage.

The actual soldering was not too much of a problem. I am a real novice when it comes to doing such things and perhaps, in hindsight, it was a little foolish to attempt it. Taking a soldering iron to your thousand pound computer, the one you’ve been using nearly every day for two years really makes you think.

You would think that soldering and desoldering various wires several times would damage the motherboard irreparably, but these things are amazingly resilient.

I fitted the Falcon into the tower case successfully, not that it compares in complexity to fitting an Afterburner, and I was determined to do this. With the design of the tower I could hinge open the machine and do all the work without having to remove the motherboard. Though many would prefer to do so.
--- Ende Zitat ---

xfalcon:
Ok,
hilft also doch nur ausprobieren. Werde erstmal die Clockpatch Variante3 aus der chips&chips ausprobieren. Den 74F04N gab es leider weder bei Reichelt noch bei Conrat. Werden angeblich nicht mehr hergestellt. Als Alternative gab mir der hilfsbereite Verkäufer einen SN4704N.
Geht der auch?

gruß
chris

Arthur:
Bei den F-Typen die man noch bekommt handelt es sich schon seid einigen Jahren nur noch als Restbestände wenn ich richtig informiert bin.

matashen:
du kannst ALS Typen nehmen, die haben fast identische Eigenschaften

tuxie:
Problem ist das die FAST !! Ausreicht das die Hurre von Falcon nichtmehr läuft! Das Timing beim Falcon ist so eng das 1ns Differenz schon zu Fehler führen kann.

F Typen oder keine! Ist leider so, hab die erfahrung selbst oft machen müssen und ich hatte schon wirklich viele in der Hand.

Navigation

[0] Themen-Index

[#] Nächste Seite

[*] Vorherige Sete