Page Comparison

The Z88 only came with 32K of internal RAM. This is not enough memory for every day use.

...

	The memory chip described in the article below is no longer available. A suitable replacement are listed. Rakewell will be selling their Flash/RAM PCB. This may be used instead of modifying the original 32K PCB board. This would upgrade the card to 1M. Amplia un cartucho de Z88 hasta 512Kbytes - Convert 32K RAM card to 512K RAM
	CYPRESS SEMICONDUCTOR - CY62158ELL-45ZSXI - SRAM, 8MBIT, PARALLEL, 45NS, 44TSOP Note: This chip will be tested, results will follow.
	ALLIANCE MEMORY - AS6C8008-55ZIN - SRAM, 8MB, 2.7-5.5V, 1024KX8, TSOP44 Note: This chip will be tested, results will follow.
	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). It currently fails in PipeDream OZ 4.2. More testing is required. LYONTEK - LY62W10248ML-55LLI - SRAM, 8M, 1MX8, 2.7-5.5V, 44TSOPIIManufacture response:- We have read the information on web-site provided from customer. Just as customer said, yes, the circuit diagram is pretty straightforward. We can not find an problem from that. Just we know, the major differences between our parts and BSI's are the design on ESD protection devices, shown as below. We use type 2 on our parts, but BSI uses type 1 without using P-diode,Dp. We wondered if this could be the issue. Maybe, we need to make some tests on customer's AP board to learn the real situations. Image Added
	This memory chip has been used in the Rakewell's Flash/RAM card successfully. This part is no longer manufactured. BSI (BRILLIANCE SEMICONDUCTOR) - BS62LV8001EIP55 - IC, SRAM 8M, 1024KX8, 2.4-5.5V, SMD

...

The memory chip described in the article below is no longer available. A suitable replacement may be

ALLIANCE MEMORY - AS6C4008-55SIN - SRAM, 4MB, 2.7V-5.5V, 512KX8, SOP32

Note: This has not been tested. Rakewell will be selling their Flash/RAM PCB. This may be used instead of modifying the original 32K PCB board. This would upgrade the card to 1M.

Amplia un cartucho de Z88 hasta 512Kbytes - Convert 32K RAM card to 512K RAM