Introduction

EPROM Programmers come in different sizes and are designed to program individual chips that either plug directly or use additional adapters before connecting to the ZIF zero-insertion sockets supplied with the programmer.

In some cases the chip is not always available. Sometimes the EPROM programmer could be able to program a chip if the individual address signal lines are changed, so a larger size device could be programmed in multiple steps. In the case of the Z88 where either a flash or EPROM chip could be programmed in a module.

The object of this card is to design a PCB that can be used in a variety of ways depending which components are fitted allowing the user to have full hardware control of the signals used.

Types of EPROM Programmers

The following types of EPROM Programmers have been identified.

• 32 pin
• 40 pin
• 48 pin

The 40 and 48 pin programmers are able to program larger memory devices as they have more address lines available. Allowing the user to manually set these additional address lines allows these larger devices to be programmed by a 32 pin programmer.

They also either have the lever that either grips the chip at the top left-hand side or the bottom right-hand side of the ZIF socket.

Design

The design of the card is split in 3 parts

Plug to fit into the EPROM programmer

• This allows a maximum length of 2 off 24 pin headers to be used so that 48 pin programmers may be used.
• These headers are repeated so that jumper wires may be used.
• Tracks are marked with a section that allows them to be permantly be cut.
• Tracks may be reconnected using a header link

Translation Section

• 2 x 12 way DIP switches
• Address Tri-state switches

48 pin ZIF Socket 

• This allows up to the a maximum size 48 pin zif socket to be used.
• The headers are repeated so that jumper wires may be used.
• Tracks are marked with a section that allows them to be permanently be cut.
• Tracks may be reconnected using a header link
• 48 pin IDC connector to allow connection to non standard external cards
• Z88 card socket connector

Space