EPROMs were used in the Z88 both for the internal ROM and externally for saving files. These had windows in them that allowed the EPROM to be erased using UV light. They are now supplied as OTP (One Time Program) devices which makes them unsuitable for storing files unless they are required to be a permanent record.
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Rakewell use their 1M / 512K PCB which allows the following cards to be built. 1M RAM, or 1M FLASH, or 512K FLASH, or 512K RAM or 512K RAM/FLASH card. If you are interested in this, please contact Rakewell directly. Circuit Diagram http://tinyurl.com/zzdmxze
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 | A suitable 512K FLASH chip replacement is AMIC - A29040CL-55F - MEMORY, CMOS, 4MBIT, PLCC-32 Additional wired links are required. | ||||||
 | SPANSION took over the AMD chips and only produced the chip in SO 044—44-Pin Small Outline Package. New PCB required. The 1M Flash chip was then withdrawn from production. Rakewell bought exiting stocks. | ||||||
 | AMD then made an equivalent chip that could be programmed without using the 12v pin. This meant that the cards could be programmed in any slot. Designing a Single Socket Solution for AMD’s Am29F080 and Intel’s 28F008SA | ||||||
 | This is how the Flash cards all started with the 1M INTEL 28F008SA Chips. They were in a TS 040—40-Pin Standard Thin Small Outline Package and could only be programmed in Slot 3, like EPROM cards. |
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