Modifying Z88 Extender Card

Owned by Vic Gerhardi
Last updated: Jan 13, 2017Version comment
3 min read

Programming different Cards

On the previous EPROM Programmers, the footprint could be set independently from the device. This is no longer the case.

The DIL header that fits into the programmer to the Z88 card has the footprint for the 512K Flash chip. When using different chips, the footprint needs to be changed to match the pin-outs of the footprint that the programmer is expecting.

A switch is used to change the pin-outs depending on which chip is being programmed. 

Work Sheet

The 1M chip connections are as follows:-

                
      34 WAY CONNECTOR Z88 CARD  
         LINK      
      34 WAY CONNECTOR PROGRAMMER   
      DIL FUNCTIONS 256K EPROM   
      DIL FUNCTIONS 512K FLASH   
      PIN OUT OF 32 PIN HEADER   
      PROGRAMMER ZIF 32 & HEADER   
       TSOP 40 Functions    
1 1   A19A19

 

 

 

 

 

 

NCA20   
2 17 /WE31A18A18NCA21   
    A1730A17A17/WE/CE22/CE/CE Vpp
    A162A16A16/OE/OE24/OE/OE
   A15A153A15A15RY/BY    
   A14A1429A14A14D7D721D7D7
   A13A1328A13A13D6D620D6D6
   A12A124A12A12D5D519D5D5
92K220    /CED41818D4D4
   VccVcc32VccVccVccVcc32VccVcc
       NCVssVss16VssVss
       /RSTVss    
   A11A1125A11A11D3D317D3D3
   A10A1023A10A10D2D215D2D2
   A9A926A9A9D1D114D1D1
   A8A827A8A8D0D013D0D0
   A7A75A7A7A0A012A0A0
   A6A66A6A6A1A111A1A1
   A5A57A5A5A2A210A2A2
   A4A48A4A4A3A39A3A3

A pull down resistor is fitted on the Z88 Card side of the connector to ensure it is selected.

The switch is glued to the board to swap the A18 and /WE signals. Footprints are hardware selected.

1M, 512K Flash v EPROM Chips

The difference between the pin-outs of the 512K Flash and EPROM chips are

The differences in the footprints are:

  • Vpp
  • A18
  • /WE

1M Flash & EPROMs

32 Pin EPROM Programmers program up to 512K devices. This switch allows the 1M Flash Card to be programmed in 2 halves.

The switch positions are used to program:-

  • DIL 512K HIGH (normal)           -  512/512K Flash / RAM cards and the top half of 1M Flash cards with 32 Pin Programmers.
  • DIL 512K LOW                          - the bottom half of 1M Flash cards with 32 Pin Programmers.
  • TSOP40 1M Flash                     - with 40 pin Programmers or EPROMs up to 256K EPROMs

Switch Card Details

Modification to Z88 Extender Card

  • The card is cut so that the unused part is removed. This enables the lights on the EPROM Programmer to to seen.
  • 4 tracks (1, 2, 9 and 17) from the 32 pin header are cut in-between the 2 off 34 way connectors and a 4 pole 3 way switch is used.
  • 2 off 2K2 resistors are connected from pin 9 on the Z88 card side and pin 2 on the switch to pin 20.
  • The holes of the 2 off 34 way connectors are used to connect to the switch. 

IMPORTANT

Wafers Flats & Slots viewed from the front of switch in extreme anticlockwise position


To Z88 Card From GQ-4X  GQ-4X 
 34 way connector 34 way connector

40 pin TSOP

32 pin DIL

Centre

Signal
 D101112    
SwitchC

7

8

9

    
ConnectionsB456    
 A123    
D9 20 via 2K299N. C.229./CE
C17 2171713131/WE
B2 17223111A18
A1 120 via 2K218A19VccA19A19
 CENTRE 1M512K L512K H1M512KDIL 
 Footprint TSOPDIL    

Circuit Diagram

This will be drawn up properly (one day) but in the meantime here is a freehand sketch.

 

 

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