HardLabs

ES688 ISA8

hkzlab·ES688_ISA8

ES688 ISA8 PCB layout, top view — open source board by hkzlab
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About the ES688 ISA8 PCB

ES688 ISA8 is an open source PCB design by hkzlab, published on GitHub under the CC-BY-NC-4.0 license. It is a 4-layer board measuring 104.1 × 99.1 mm, with 121 components from 52 distinct parts.

Other key parts include the 74LS14, 74LS244, NE558, 74LS245 and ES688F. By type, the board carries 59 capacitors, 27 resistors, 12 inductors, 10 ICs, 10 connectors and 1 crystal.

It belongs with the audio and retro computing designs in this gallery.

From the project

Sound Card for the ISA (8bit) bus sporting Sound Blaster / Sound Blaster PRO emulation via ES688F chip, and a real Yamaha OPL3 FM Synth. It's also completely jumper configurable.

This is a sound card for the ISA 8bit bus sporting the ES688F chip by ESS Technology and the YMF262 chip by Yamaha, also known as the OPL3.

This board provides selectable Sound Blaster PRO / Sound Blaster emulation and OPL3 compatibility.

It's completely jumper-configurable, requiring no software except the essvol utility to set the volume.

This board provides the following connections:

ES688 ISA8, from the project README
From the project README

Main components on the ES688 ISA8

74LS1474LS244NE55874LS245ES688FL78L05YMF262-MYAC512LM1877LM3403

ES688 ISA8 bill of materials (BOM)

121 components, 52 distinct parts.

QtyPartRefs
1
74LS14
U1
1
74LS244
U2
1
NE558
U3
1
74LS245
U4
1
ES688F
U5
1
L78L05
U6
1
YMF262-M
U7
1
YAC512
U8
1
LM1877
U9
1
LM3403
U10
1
14.318Mhz
Y1
1
ISA BUS
J1
1
Interrupt Select
J2
1
Address Select
J3
1
DMA Select
J4
1
Joystick/MIDI
J5
1
LINE OUT
J6
1
MIC
J7
1
LINE IN
J8
1
SPKR OUT
J9
Show 32 more
QtyPartRefs
1
AUX
J10
1
Emulation Mode
JP1
1
Volume Knob
RV1
3
Filter
L1, L2, L3
8
BLM21PG331BH1D
L4, L5, L6, L7, L8, L9, L10, L11
1
742792093
L12
7
10uF
C2, C4, C33, C34, C37, C38, C42
12
100nF
C3, C20, C21, C24, C30, C36, C48, C49 +4
3
100nF
C5, C6, C7
9
10nF
C8, C10, C13, C14, C15, C16, C17, C18 +1
3
1nF
C9, C31, C32
2
10pF
C11, C12
10
220nF
C22, C23, C26, C27, C28, C29, C39, C40 +2
1
150pF
C25
2
47uF
C35, C41
2
10nF
C43, C44
2
2.7nF
C45, C46
1
33-68pF
C47
2
470uF
C50, C51
2
5nF
C52, C53
1
100uF
C54
4
2.2k
R1, R2, R19, R21
2
7.5k
R3, R4
2
15k
R5, R6
6
10k
R7, R8, R18, R20, R22, R23
2
33k
R9, R10
4
820k
R11, R12, R13, R14
1
33
R15
2
2.7
R16, R17
2
1k
RN1, RN3
1
10k
RN2
1
2.2k
RN4

ES688 ISA8 design files

The KiCad project lives in the hkzlab/ES688_ISA8 repository on GitHub; these links point at the commit this page was built from.

ES688 ISA8: common questions

How big is the ES688 ISA8 PCB?

The ES688 ISA8 measures 104.1 × 99.1 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the ES688 ISA8?

121 components, from 52 distinct parts. The full bill of materials is listed on this page.

Where can I download the ES688 ISA8 design files?

From the hkzlab/ES688_ISA8 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the ES688 ISA8 design in my own project?

It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.

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