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Digiblaster HowTo
Place the SID card in front of you with the edge connector facing you. The notch of the SID should now be pointing to the left. Use a small screwdriver to gently pry the SID out of its socket. Then insert the Digiblaster into the socket in place of the SID so that the longer part of the Digiblaster points backwards. Now insert the SID into the Digiblaster. The notch on the housing must be on the left, as before. That's all. I cannot accept liability for incorrectly installed Digiblasters or wrongly inserted SIDs. It goes without saying that the computer must be switched off during this work or that the SID card is not plugged into the computer.
If you want to use the digitizer on the Digiblaster, it must first be adjusted. This can easily be done with the following line:
do:pO64863,0:?pE(64863):loop
Then use a screwdriver to turn the pot on the Digiblaster until the displayed value fluctuates around the number 128.
If you only want to listen to music with the Digiblaster, no further connections are necessary. The output is via the SID and the SID card. If you would like to digitize music, connect the enclosed cable to the Audio In input of the SID card and to the headphone output of a Walkman, recorder or stereo system. First set the volume to zero. Only use the cable provided, as it safely interconnects both channels. However, an extension cable can also be used.
You can use the included "Digital Composing Kit" from APOS to sample, compose and edit Digis. Instructions for this program can be found on the main disk, as well as two help screens for each part of the program. Start the program with la"* if you re using OS92 or with load"*",8.1 otherwise. You can also load each individual program part with DLOAD.
The Digiblaster uses the following addresses, which are "stolen" from the SID address range:
- $fd5e, 64862 is the output register to the digital-to-analog converter (DAC).
- $fd5f, 64863 is the register for the analog-to-digital converter (ADC).
Writing any value starts the sampling process. Then at least 48 clock cycles must elapse before the sampled value can be read from this register. Since the conversion is directly linked to the clock of the Plus/4, this means that the smallest timer value for timer 1 is 48. The DAC outputs its signal to the SID audio input. It is therefore important that the volume is set in the SID so that something can be heard. In addition, the sound can be processed through the SID filters. You can find out more from the overview of the SID registers that you received with the SID card.
Solder owns the copyright to the Digiblaster. The Digiblaster is a development of his.
APOS has the copyright to the Digital Composing Kit. The program is not a PD or freeware. It may therefore not be copied further without permission. The program is also available separately from APOS for DM 10. The software is freeware.
(C) 4/1994, 2006 Solder/Synergy, Christian Schäffner, Gänsekamp 21, 38162 Schandelah, solder@gmx.net
APOS, Christian Prieth, Hermannstrasse 6, 31195 Lamspringe