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The Z88 has 32K of internal RAM. This is not enough memory for every day use.
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To aid construction, these converters may be used to allow the new surface mount devices to be used as larger devices. Let's face it, DIL or DIP packages are a lot easier to handle and solder. These converters may be used to 'bridge that gap.' Here are some examples:-
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External RAM (fitted in the card slot)
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These became available about a year after the Z88 was released, but at £200 each, using 4 x 128K smd internally, most users bought the 128K at just under £50.
Memory prices have fallen since then so this is more attractive now to go for the largest card available.
1M RAM
512K RAM
 | Amplia un cartucho de Z88 hasta 512Kbytes - Convert 32K RAM card to 512K RAM The memory chip described in the article above is no longer available. Suitable replacements are listed below. |
 | ALLIANCE MEMORY - AS6C4008-55SIN - SRAM, 4MB, 2.7V-5.5V, 512KX8, SOP32 Note: This has not been tested. |
Internal RAM
The internal 32K of RAM is not large enough. Upgrading this to 128K or 512K internally is possible, but the original 'built-in' OZ operating system did not use this correctly.
Cambridge Computer commissioned OZ 4.0 ROM and were planning to use this with the new User Guide v3 but only the User Guide was changed. The new ROM was made available to users through the Z88 User Group.
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Note: On this motherboard the RAM socket is a 24 pin which is big enough for 32K. Later versions had a 28 pin fitted.
512K RAM
128K RAM
 | ALLIANCE MEMORY - AS6C1008-55PCN - SRAM, 1MB, 2.7V-5.5V, 128KX8, PDIP32 This has not been tested yet |
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