This is revision A of the EPROM Adaptor Board and it is currently a work in progress.

EMDP1 EPROM Adaptor Board (Rev. A)

Table of Contents

• Table of Contents
• Introduction
• Schematic
• Printed Circuit Board
• Issues

Introduction

The EPROM adaptor is used to program the 27C080, 27C040, 27C020, 27C010, 27C512, 27C256, 27C128, 27C64, 2732, and 2716. (The venerable 2708 requires an extra -5V bias voltage, so we do not support that chip.)

Schematic

The schematic for this revision is shown below:

The N1 connector is assigned as follows:

Pin	Name	Connected To
1	SCL	U1-SCL
2	GND	Ground
3	SDA	U1-SDA
4
5
6	+5V	Vcc
7
8	BD0	ZIF40 Pin 25
9	BD1	ZIF40 Pin 27
10	BD2	ZIF40 Pin 26
11	BD3	ZIF40 Pin 28
12	BD4	Strobe A6-A11
13	BD5	ZIF40 Pin 15; U2-A4; U3-A10
14	BD6	ZIF40 Pin 30
15	BD7	ZIF40 Pin 13; U2-A3; U3-A9
16	BD8	ZIF40 Pin 31
17	BD9	ZIF40 Pin 29; U2-A5; U3-A11
18	BD10	Strobe A0-A5
19	BD11	ZIF40 Pin 11; U2-A2; U3-A8
20	BD12	Plug BD12
21	BD13	ZIF40 Pin 10; U2-A1; U3-A7
22	BD14	Plug BD14
23	BD15	ZIF40 Pin 9; U2-A0; U3-A6
24	BD16	Plug BD16
25	BD17	Program LED
26	BD18	Plug BD18
27	BD19	ZIF40 Pin 39
28	BD20	ZIF40 Pin 33
29	BD21	Plug ID0
30	BD22	Plug ID1
31	BD23	Plug ID2
32	BD24	Plug ID3
33	BD25	Ground
34	BD26	Ground
35	BD27
36	VAR1	Plug V1
37	VAR2	ZIF40 Pin 40
38
39
40

The plug, N3, has its pin assignments as shown below:

Pin	Name	Connected To
1	P16	ZIF40 Pin 16
2	A10	U3-A10
3	A0	U3-A6
4
5	A11	U3-A11
6
7	P14	ZIF40 Pin 14
8	P1	ZIF40 Pin 1
9
10
11	P12	ZIF40 Pin 12
12	BD12	N1-BD12
13	P32	ZIF40 Pin 32
14	BD14	N1-BD14
15	P34	ZIF40 Pin 34
16	BD16	N1-BD16
17	P36	ZIF40 Pin 36
18	BD18	N1-BD18
19	P37	ZIF40 Pin 37
20
21	GND	Ground
22	V1	N1-VAR1
23	ID1	N1-BD22
24	ID0	N1-BD21
25	ID2	N1-BD23
26	ID3	N1-BD34

There are a total of 12 address bits that are latched. 11 of them are used. The table below shows where all the address bits go:

Name	Loaded From	Connected To	Strobe
A0	N1-BD15	ZIF40 Pin 2	N1-BD10
A1	N1-BD13	ZIF40 Pin 3	N1-BD10
A2	N1-BD11	ZIF40 Pin 4	N1-BD10
A3	N1-BD7	ZIF40 Pin 5	N1-BD10
A4	N1-BD5	ZIF40 Pin 6	N1-BD10
A5	N1-BD9	ZIF40 PIn 7	N1-BD10
A6	N1-BD15	Plug A6	N1-BD4
A7	N1-BD13	ZIF40 Pin 38	N1-BD4
A8	N1-BD11	ZIF40 Pin 35	N1-BD4
A9	N1-BD7	ZIF40 Pin 8	N1-BD4
A10	N1-BD5	Plug A10	N1-BD4
A11	N1-BD9	Plug A11	N1-BD4

Printed Circuit Board

The following printed circuit board files exist:

eprom_artwork.png

The artwork layer picture (PNG).

eprom_back.png

The back layer picture (PNG).

eprom_front.png

The front layer picture (PNG).

eprom.gal

The artwork Gerber (RS274X) file.

eprom.gbl

The back (solder side) Gerber (RS274X) file

eprom.gtl

The front (component side) Gerber (RS274X) file.

eprom.gml

The mask (both sides) Gerber RS274X) file.

eprom.drl

The drill (Excellon) file.

eprom.tol

The tool file that lists hole counts.

Issues

Any fabrication issues will be listed here.