Status: Released - see https://github.com/etomuc/CPC6128_iRAM-640
Note: Even smaller commercial alternative available by Lotharek.pl
Status: Released - see https://github.com/etomuc/CPC464-iRAM1024
== considered ==
=== PLUS iRAM/1024 ===
* 1Mb upgrade for Plus series
* less DIY friendly, probably needs more complex CPLDs (ATF1504)
Status: very early stage, still considering if it's feasible
=== GX iRAM/512 ===
* 512K upgrade for GX4000
* less DIY friendly, probably needs more complex CPLDs (ATF1504)
Status: just an idea
== abandoned ==
=== CPC 6128 - iRAM/640s ===
* minified iRAM/640
* for CPC 6128
* size just a tiny bit bigger than Z80 CPU socket
* TSSOP SMD components below Z80
* requires good soldering skills and special tools to program SMD CPLDs
Status: fully designed, abandoned as it offers no advantage over DIY friendly version and would only benefit commercial sellers
(Hint: Lotharek offers a similar expansion commercially for a good price)
=== CPC 464/664 - iRAM/1024s ===
* smaller than iRAM/1024, more similar in size to iRAM/640
* for CPC 464 and 664
* single 1MB SMD SRAM, upgrade to 1024K
* [http://norecess.cpcscene.net/advancedmemoryusage.html C3 RAM banking] supported
* easy to assemble, mostly through-hole components but one SMD SRAM
Status: working prototype
=== CPC 6128 - iRAM/576 ===
* for CPC 6128 only
* 512K expansion
* total accessible RAM of 576K in a 6128 (following the DK'Tronics standard)
* easy to assemble, all through-hole components
Status: Abandoned in favor of the iRAM/640 which uses the exact same components but offers more total memory.
=== CPC 464/664 - iRAM/512 ===
* for CPC 464/664
* 512K expansion
* total accessible RAM of 512K in a CPC, following the DK'Tronics standard and support of C3 mode.
* or 576K without C3 support (512K_C3 / 576K selection per manual switch)
* easy to assemble, all through-hole components
Status: Abandoned as CPC iRAM/1024 will fit into all 464s/664s and is more flexible
[[Category:Hardware]] [[Category:Memory expansions]]