Nginring Chrng Ofl Dfl

Rudnick Approval HlL Chief Engineer Affects Product Drumulator Affects Assembly Drumulator PCB DA-303 Rev 1 Serial Nos. Modified in Production 70_ Notation to Modify Units in Repair (see reverse) Approximate Starting Serial-No. for New Documents 70________ (visual check or call factory to verify) Purpose of Change To raise Slider Shaft 1 16 to increase knob clearance above housing._ For Future Units _x_Modify Units in Production x Modify all Units Available for Repair x...

NGiNring Chrng Ofi Dfl

Rossum Approval Chief Engineer AffantaPrnriunt- Drumulator AffflrtsAssamhly Dmmul ator PCB DA-303 ReV 1 Serial Nos. Modified in Production _ (visual check or call factory to verify) Notation to Modify Units in Repair _ Approximate Starting Serial No. for New Documents Purpose of Change Allows operation below 100VAC. improves operation on low lin For Future Units x Modify Units in Production Modify all Units Available for Repair PARTS AFFECTED Modify any unit that won't run on...

Nginring Chang Ord6r

Rossum Approval 1 Chief Engineer ' Confidential _Customer Release X Affects Product Drumulator Affects Assembly PCB rev 1 Serial Nos. Modified in Production _ Notation to Modify Units in Repair _ Approximate Starting Serial No. for New Documents 682 P.C.B. Serial No. 700_ (visual check or call factory to verify) Purpose of Change To remove buzz on Bass drum output For Future Units _x Modify Units in Production Modify all Units Available for Repair PARTS AFFECTED 3. OK...

Drumulator Signal Name Definitions

The signal names are comprised of (a) + or - specifying active high or low. (b) An abbreviation of the signal function, (c) An abbreviation of the signal type, (d) The signal's destination and source page numbers. Source page is indicated by an following the page number. If there is no after a page number then the present page is the source page. If the present page is listed with the destination page numbers then the signal appears again on the same page. (a) (b) (c) (d) EXAMPLE - CSWHI .D 2 ,...

Interface Specifications Revision of 19

The Drumulator was designed as a low cost digital drum machine with a minimum of expensive frills. As a result, the hardware contains no provision for external control, such as a parallel or serial port (nor is there any extra board space for such a component). However, due to popular demand, we have decided to add a feature for the computer hobbyist, allowing you to completely control the Drumulator sound generator via your external computer. The External Computer feature comes standard with...

5Drumulator Debug Package

The Drumulator debug package is intended for both production and field testing debugging of Drumulator hardware. It is not intended as a final Q.A. functional test system, as this must be accomplished with the current production release of Drumulator software and a separate procedure will be outlined for final testing. Rather, the debug package is designed to isolate specific problems within a Drumulator and assist the technician in correcting them. The Drumulator debug package consists of a...

3Drumulator Theory of Operation

The Drumulator is a computer controlled digital synthesizer designed specifically to produce digitally recorded drum sounds using relatively inexpensive hardware. This has been accomplished by making extensive use of software, both by the main Z-80 CPU, and by the special purpose register file controller. As a result, the theory of operation of many of the Drumulator functional blocks requires an understanding of both the hardware and the effective function of the driving software. SEE PAGE 29...

Drumulator Testing Procedure

This section of the manual will describe how to test the Drumulator for proper functionality and give a few pointers on troubleshooting. Note that each step will have references to other sections of the manual for further information. The Drumulator is a software-based instrument, and software never breaks. Therefore, testing will be restricted to the hardware, which is quite easy. As an example some of the blue buttons control six functions in software but only need to be pressed once to test...