Programming Manual

The Chroma Programming Manual is an extension of the Chroma Performance Manual. The Performance Manual contains basic operating information and hookup instructions, so be sure to read it before starting this manual. Refer to the Chroma Interface Manual for detailed information about the external computer interface commands and connections.

Many of the sections in this manual are technical in nature, and may seem confusing at first. Remember that it is not necessary to understand precisely all aspects of the Chroma to successfully program it. Read the Structure and Programming sections first, then refer to the fold-out panel which is inserted in the rear of this manual. When you need more information about the function of a particular switch or control, refer to the manual.

Often good programs evolve by modifying existing programs by ear. Before altering a program, always examine the structure of the existing program first. Check the following parameters in existing programs before editing:

[PATCH] - defines the synthesizer channel configuration
[MOD SEL] - (9 total) determines which envelopes are being used, and where

Specification Change

Earlier version of the Chroma had a parameter called POLY/MONO [2]. This paramter has been replaced with FOOTSWITCH MODE [2]. The panel graphics should be ignored, as the [2] switch will function as the FOOTSWITCH MODE parameter despite its title. (The functions of all of the switches are determined by the Chroma's internal software, which can be changed and updated at any time.)

NOTE: THIS MANUAL IS A PRELIMINARY COPY. A MORE COMPLETE REVISED EDITION WILL BE RELEASED SHORTLY. TO OBTAIN A COPY OF THE REVISED PROGRAMMING MANUAL, CONTACT: RHODES/CHROMA SERVICE DEPARTMENT, 86 CUMMINGS PARK, WOBURN, MASS 01801. PLEASE INCLUDE YOUR SERIAL NUMBER.

The revised edition appears never to have been completed or released. Steve Grom [21030502+] of Fender writes, "I don't think I even saw a rough draft of the second programming manual, but we did talk about it. There were other more pressing issues." [March 2008]

Programming Manual Revision 1 for Chroma Software Revision 10—April 14, 1982

Note that a number of corrections have been made throughout this online version of the manual. These range from spelling mistakes to errors in parameter values. Corrections are based on Chroma Software Revisions 12 and 14. Thanks to David Clarke [21030085++] for his help with this and for a general review of these pages. See EPROM Code for downloads of binary copies of the chip contents.

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