| Table of Contents |
|---|
...
There are 3 types of RAM chips that may be used either Internally or Externally.
- Static RAM
- Pseudo Static RAM
- RAM that should work but doesn't
Modern Static RAM chips are at the top of the list. They are now called static RAMs because data can be written into an address location and when that location is read again, the data is still there. Now manufactured in smaller physical packages rather than the DIL (Dual In Line) or DIP packages that are used on the Z88 Motherboard and some external cards. unbelievable Unbelievable low current consumption when compared to the RAM chips used in the 1980's give longer battery life. Fortunately, PCB Footprint Converter are available. This allows these smaller size chips to be used now with the Z88.
...
 | 32 pin SOIC to DIL PCB |
 | 44 pin tsop to DIL PCB |
External RAM (fitted in the card slot)
...
 | 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.. |
 | CYPRESS SEMICONDUCTOR - CY62158ELL-45ZSXI - SRAM, 8MBIT, PARALLEL, 45NS, 44TSOP This memory chip is being used in the Rakewell's Flash/RAM card successfully. TESTED OK |
| ALLIANCE MEMORY - AS6C8008-55ZIN - SRAM, 8MB, 2.7-5.5V, 1024KX8, TSOP44 TESTED FAILS |
| LYONTEK - LY62W10248ML-55LLI - SRAM, 8M, 1MX8, 2.7-5.5V, 44TSOPII This memory chip is a 'drop-in' replacement for the BSI chip (see below). TESTED FAILS when loading a file in PipeDream. |
| BSI (BRILLIANCE SEMICONDUCTOR) - BS62LV8001EIP55 - IC, SRAM 8M, 1024KX8, 2.4-5.5V, SMD This memory chip has been used in the Rakewell's Flash/RAM card successfully. TESTED OK This part is no longer manufactured. |
...
| 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.
...