Actually, I was looking for this information for 3 years!...now thanks to you, the manual is on my hands and of great help, cause I understand now where I was doing wrong connections and wires...excellent, I'll be back to you if in need, thank you.
This manual covers the main equipment features only. While it also includes the procedure for saving and loading from the now long obsolete memory cards it does not mention the how to operate with the optional floppy drive interface so I am still at a loss about how to use this! Note that there is a separate manual covering the MIDI interface and programming via the keyboard, not included in this download. You will also need to get hold of this if you want to use the MIDI interface properly. Basically there is little difference between this manual and the free to download manual for the similar PR60 model.
Good list of manuals. I found a very rare one and easily get. Should be promptly to download, as we must to wait hours even after confirmed payment.
Text excerpt from page 10 (click to view)
Model 4 12A
Section 111
3-12. AMPLIFIER OPERATION.
3-13. The Model 412A/AR DC Amplifier Output may be used to drive devices such as an analog recorder to provide a permanent record of measurements. Output level is 1 .O volt
at full scale; maximum rated load current is 1 .O mA. Load currents in excess of 1.0 mA (less than 1000 ohms load resistance) may cause errors in meter indication and amplifier gain. Amplifier gain is from +lo00 on the ,001 range to -1000 on the loo0 range.
