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The Z88 has 32K of internal RAM. This is not enough memory for every day use.
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 | 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 (fitted on the Motherboard)
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
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 | Motherboard Conversion in Service Manual | ||
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| Picture | Device | Operating | Standby |
 | 32K RAM Standard in Z88 NEC 42832 32k x 8 Pseudo Static RAM 150 mS Datasheet | 1 W 200mA | 2.8 mW |
  | HITACHI HM658512LP-12 4Mb PSRAM HM658512 (250mW active) TESTED OK by Benny This part is no longer manufactured. | 75mA
| 2mA |
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CYPRESS-SEMICONDUCTOR-CY62148ELL-55SXI-IC-SRAM-4MBIT-512KX8-5V SOIC32
| 20mA
| 3.5uA |
| ALLIANCE MEMORY - AS6C4008-55PCN - SRAM, 4MB, 2.7V-5.5V, 512KX8, PDIP32 This has not been tested yet Datasheet | 30mA | 4uA |
| ALLIANCE MEMORY - AS6C4008-55SIN - SRAM, 4MB, 2.7V-5.5V, 512KX8, SOP32 This has not been tested yet | 30mA | 4uA |
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