14.1 Clockpatch with 74F04

Hints and Tips for SCSI, Cubase Audio and FDI(Falcon Digital Interface)

To eliminate your SCSI-Problems with Falcon F030 Computers. Following the next five steps. This patch is not relevant for accelerated falcons! Use the patch with 74F08 for speed up falcons!

1. Use the modifikation with a 74F04, described as below.
2. Use TOS 4.02 or any later release.
3. Cubase Audio won't give you any warning if your external
   SCSI drive is full. So check if there enough room on
   your drive for sampling, you will get errors like
   SCSI connection lost ect.
4. The maximum partition size for your harddisk is 1GB (with HDDdriver 7.x)
5. FDI (also knows as SP-DIF Interface) will work on ALL FACONS's 030
   with TOS 4.02 or higher, in case of bad sound using the
   FDI please exchance the FDI.

This test was running by several Falcon's 030 from different production dates. For Cubase Audio we used version 1.01. The FDI_INIT.PRG used in AUTO-Directory was 1462 bytes and dated 30/0/1993.

We like to thank Martijn van Duin, TSI (Benelux) and Soundpool
(developer FDI) for their support and providing.

MODIFICATION CPU CLOCK SIGNAL

The SDMA is clocked by the 16Mhz CPU-clock. With some software or external SCSI-devices it's possible to get a disturbance on this clock-signal. This can express itself with cracking noise on the audio or problems with recording large soundfiles on the harddisk. If the Falcon030 has these problems, the following modifications have to be done. Also compress your SCSI-devices before you start with any sound sampling. That's also the best way too before burn a CD with your SCSI CD-burner. CD image files must be loadet with the highest avaiable disk speed.

1. Remove SMD resistor R221,R216 and R222 between the CPU and COMBEL.

2. Bent the pins of the new 74F04 to the outside exept. no.14

3. Connect pin 2 to 9, 11 and 13 of the 74F04.

4. Place the 74F04 on PAL U63 as shown below.

5. Solder pin 14 of the 74F04 on pin 20 of U63.

6. Solder some wires as shown in the .GIF diagram below.

Do not connect any other pin or wire as show in the description!

All informations take by fax per 07.OCT.94 17:07
Atari Corp. Vianen/Benelux, the day after insert a screeneye im my own Falcon. Thank you Wilfred Kilwinger

(After this modification screeneye will be work nice too!)
Thank's to OverScan and Syntesizer Studio Jakob Taunusstein/Germany!

Informations (c) Atari Corp.
Pictures 1995 (c) Robert Schaffner