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Wednesday, 25-Nov-2020 16:51:25 GMT


Z88 Hardware


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FLASH Card Information

Update

Z88 card showing fixing

It is quite rare in the Z88 world when many things happen at the same time, but they have.

Here is a variant of the Card Case allowing access to the PCB. Not required for the usual Z88 user.

Card Case History

CC Card Case

When Cambridge Computer manufactured the Card Case, they used a mechanical press to squash the top of the 4 plastic pins that held it all together.

This was a cost-effective way, but not necessarily the best solution.

cc card

The Flash cards supplied later used small self tapping screws.

These worked well but occasionally failed leading to “The external card problem.”

Initially, an enterprising Z88 User designed a stronger case using nuts and machine screws. This used the existing Cambridge Computer top part of the case. This was followed by a later design. Both of these are currently in use successfully.

Card Case Mk 1

Card case with no labels

The 2 machine screws here are just at the connector end replacing 2 of the pins, preventing the card from coming apart.

We can supply the following for the older MK 1 design upon request.
  • Cambridge Computer Card Tops
  • 2 machine screws
  • 2 Nuts



Card Case Mk 2

New Card Case Top

This a picture of the latest 4 machine screw design, which is all printed by the 3D printer. This is stronger and has now replaced the 2 machine screw design.

This ensures that the 38 connections are made giving greater reliability. Initial results from users are encouraging. If you are experiencing this issue, consider changing the case.

The Cambridge Computer cards two chamfered corners need filing down by about 1mm to allow the cards to fit in the new case.  This won't compromise any of the circuit. The original metal labels should be carefully peeled off and glued to the new case.

Card Case Bottom




3D Printer Details

If you have a 3D printer download the program and designs from the Z88 Internet Links. on the right - under OpenSCAD and Z88 3D Printer Card Details.

Card Case and Machine Screws

Note: The case is supplied as two parts of the new case connected with four machine screws. The four nuts are embedded in the bottom half.

This picture shows the two halves which are then screwed together with the PCB (not supplied) in the middle.

If you print your own, we can supply the following:
  • 4 machine screws
  • 4 nuts
(Prices in the table below).

Card Case Top & Bolts

Replace Card Case

Alternatively, we are offering a service to replace the case on your Z88 cards be it
  • RAM
  • Flash and update OZ software
  • Or EPROM Cards
Return your card today with £30 which includes UK Royal Mail Signed For® 2nd Class & VAT

On the other hand, if you are not experiencing problems, you could just
  • order a new Flash card.
These have the latest case and software fitted as standard. Erase your existing flash card and use it to store extra files.


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Z88 Hardware
Description Price VAT Total
Cable - Printer (Parallel) £34.00 £6.80 £40.80
Cable - Printer (Serial) £5.00 £1.00 £6.00
Card Case
£6.66
£1.33
£8.00
Card Case (machine screws and nuts only (4 or 2)
£4.00
£1.00
£5.00
Carrying case £6.95 £1.39 £8.34
Flash EPROM (1M) £45.83 £9.17 £55.00

Flash EPROM (512K) / 512K RAM

£49.17 £9.83 £59.00
EPROM Eraser
£16.67
£3.33
£20.00
EPROM pack (32K) NONE LEFT
EPROM pack (128K) £25.00 £5.00 £30.00
EPROM pack (256K) £49.17 £9.83 £59.00
Keyboard
£20.00
£4.00
£24.00
Keyboard Membrane
£20.83
£4.16
£25.00
Mains Adapter (220v) £8.95 £1.79 £10.74
Modem 300/1200-software & cable £25.00 £5.00 £30.00
Modem £10.00 £2.00 £12.00
Power Supply (90-264v) £12.50 £2.50 £15.00
RAM pack (1M) (low power)
£49.16
£9.84
£59.00
RAM pack (1M) (CC)
£40.83 £8.17 £49.00
RAM pack (512K) £37.50 £7.50 £45.00
RAM pack (128K) £20.83 £4.17 £25.00
Topper - Heavy Duty Version Out of Stock


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Z88 Extra Internet Links


Search for discontinued INTEL Flash chip

Designing a Single Socket Solution for
AMD’s Am29F080 and Intel’s 28F008SA


Picture of an AMD chip


Spec sheet for the latest AMD Flash chip

Search for AMD Flash chip


STMicrosystems

STMicrosystems Datasheet was going to replace the AMD chip



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Vic Gerhardi

Rakewell Limited
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