Alesis HR 16 Drum Machine Circuit Bending Patchbay

Sources: Electri-fire Vidiotsquad

Modifications

Added a 'circuit bending' patchbay to the HR 16 to expand the sonic capabilities of the instrument. The video above shows a sampling of the sonic capabilities of this circuit bent HR 16. Bends can be created using the included patch cords (standard banana jack patch cords).

Cleaned the button contacts with a white easer

Replaced the internal battery with a CR2032 battery and battery holder. This circumvents the issue of soldering/desoldering the original, specialized battery.

Patchbay Details

The HR16 uses a 27C040 4k EPROM memory chip for sample storage (datasheet). The patchbay exposes pins on memory chip so data and address pins can be shorted together. The bend points are color coded as follows:

Pin	Label	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 IO
14	Q1	Data IO
15	Q2	Data IO
16	Vss	Ground
17	Q3	Data IO
18	Q4	Data IO
19	Q5	Data IO
20	Q6	Data IO
21	Q7	Data IO
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