The iRAM/640 is a DIY friendly, internal RAM expansions for the CPC 6128.

The iRAM expansion sits in the CPU socket and requires no additional soldering inside the CPC.

The first 512K of expansion RAM follow the DK'Tronics addressing mode standard, giving up to 576K of RAM to legacy software. More modern software that supports the extended 1M-4M standard will be able to access all the provided RAM.

• 512K expansion
• total accessible RAM of 640K in a 6128 (64K Base RAM + 512K RAM expansion + 64K secondary RAM bank of the 6128)
• easy to assemble, all through-hole components
• fits into a CPC 6128. In Schneider CPC 6128 the metal shielding needs to be removed or altered.

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Notes:

• When ordering the PCB selecting a 1mm thick PCB will save some space. The available space in the 6128 is really limited and even 0.6mm can help
• capacitors need to have a 2.56mm footprint
• the 22uF capacitor should have a small height of 5 or 6mm
• instead of the 74HCT174 the 74LS176 can also be used
• Project repository with detailed assembly instructions: https://github.com/etomuc/CPC6128_iRAM-640

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License:

The project is released under the CC BY-NC-ND 4.0 license with the following exception: Commercial production and selling is permitted as long as the final product will be sold for a maximum of €30, USD 30, UKP 28 or the equivalence of €30 in another currency (excluding shipping).