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Alesis HR-16

WARNING!!!

Be carefull with your HR-16 / HR-16B. Some pioneers have fried several devices and recommend using ONLY the EPROM chips.

Datasheet for HR-16 Memory chips

Here a Copy in case of dead link, with comments:

27C040/27C4001 - 4096K (512kb x 8) 100ns CMOS EPROM

RED: risky or less usefull and best avoided

GREEN: all usefull points alter memory read out, effects change with instrument sample chosen

BLUE: outputs: alter audio waveforms and use to bend address pins

Pin Number	Description
1	Vpp - Program Supply
2	A16 - Address Input
3	A15 - Address Input
4	A12 - Address Input
5	A7 - Address Input
6	A6 - Address Input
7	A5 - Address Input
8	A4 - Address Input
9	A3 - Address Input
10	A2 - Address Input
11	A1 - Address Input
12	A0 - Address Input
13	Q0 - Data Input/output
14	Q1 - Data Input/output
15	Q2 - Data Input/output
16	Vss - Ground
17	Q3 - Data Input/output
18	Q4 - Data Input/output
19	Q5 - Data Input/output
20	Q6 - Data Input/output
21	Q7 - Data Input/output
22	E - Chip Enable
23	A10 - Address Input
24	G - Output Enable
25	A11 - Address Input
26	A9 - Address Input
27	A8 - Address Input
28	A13 - Address Input
29	A14 - Address Input
30	A17 - Address Input
31	A18 - Address Input
32	Vcc - Positive Power Supply

Multiple points can be interconnected, although the more bends you connect the more likely it is to crash it. Three to four points interconnected is just about the maximum. To be relatively crashfree restrict yourself to connecting maximum three points together or two seperate bends.

Finding the EPROM is easy. Below left: these 25 points I selected at the EPROM and connected to a DB25 parallel port. To the right: use of hotglue to prevent wires from shaking and breaking off.

Demo: HR16 as a synthesizer. A pattern was recorded with the "Fill" function on and quantise on 64th notes. Then played and engaging bends with one of my external controllers with momentary on buttons.

effects, circuitbent stuff,schematics

Alesis HR-16