CPC iRAM: Difference between revisions
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The first 512K of expansion RAM follow the [[Standard_Memory_Expansions#Standard_128K-512K_Expansions_.28dk.27tronics.2Fdobbertin-style.29|DK'Tronics addressing mode standard]], giving up to 576K of RAM to legacy software. More modern software that supports the [[Standard_Memory_Expansions#Extended_1M-4M_Expansions_.28RAM7.2FYarek-style.29|extended 1M-4M standard]] will be able to access all the provided RAM. | The first 512K of expansion RAM follow the [[Standard_Memory_Expansions#Standard_128K-512K_Expansions_.28dk.27tronics.2Fdobbertin-style.29|DK'Tronics addressing mode standard]], giving up to 576K of RAM to legacy software. More modern software that supports the [[Standard_Memory_Expansions#Extended_1M-4M_Expansions_.28RAM7.2FYarek-style.29|extended 1M-4M standard]] will be able to access all the provided RAM. | ||
== CPC iRAM/640 == | == released == | ||
=== CPC iRAM/640 === | |||
* for CPC 6128 only | * for CPC 6128 only | ||
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Status: Released - see https://github.com/etomuc/CPC6128_iRAM-640 | Status: Released - see https://github.com/etomuc/CPC6128_iRAM-640 | ||
== CPC iRAM/ | == currently in development == | ||
=== CPC iRAM/1024 === | |||
* for CPC | * for CPC 464/664 | ||
* | * offers two sockets for SRAMs | ||
* | * upgrade to 576K (1 SRAM) or 640K/1024K (2 SRAMS) | ||
* first SRAM: Upgrade to 576K, following the DK'Tronics standard without support of C3 mode (like many other RAM expansions) | |||
* second SRAM: upgrade to 640K (128K SRAM) or 1024K (512K SRAM) | |||
* [http://norecess.cpcscene.net/advancedmemoryusage.html C3 RAM banking] supported if both SRAMs are fitted | |||
* easy to assemble, all through-hole components | * easy to assemble, all through-hole components | ||
Status: | Status: in active development | ||
== | == paused / abandoned == | ||
=== CPC iRAM/1088 === | === CPC iRAM/1088 === | ||
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* easy to assemble, but some SMD components due to size constraints in the CPC 6128 | * easy to assemble, but some SMD components due to size constraints in the CPC 6128 | ||
Status: Prototype successfully tested. | Status: Prototype successfully tested. No final PCB yet. Might be resumed if there's demand. | ||
=== CPC iRAM/ | === CPC iRAM/576 === | ||
* for CPC | * 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 | * easy to assemble, all through-hole components | ||
Status: in | Status: Abandoned in favor of the iRAM/640 which uses the exact same components but offers more total memory. | ||
=== CPC iRAM/512 === | === CPC iRAM/512 === | ||
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Status: currently on halt as CPC iRAM/1024 will fit into all 464s and 664s and is more flexible | Status: currently on halt as CPC iRAM/1024 will fit into all 464s and 664s and is more flexible | ||
[[Category:Hardware]] [[Category:Memory expansions]] | [[Category:Hardware]] [[Category:Memory expansions]] | ||
Revision as of 22:29, 12 February 2025
CPC iRAM is a series of open source, DIY friendly, internal RAM expansions for the CPC 6128 (later hopefully also for the 464 and 664).
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.
released
CPC iRAM/640
- for CPC 6128 only
- 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.
Status: Released - see https://github.com/etomuc/CPC6128_iRAM-640
currently in development
CPC iRAM/1024
- for CPC 464/664
- offers two sockets for SRAMs
- upgrade to 576K (1 SRAM) or 640K/1024K (2 SRAMS)
- first SRAM: Upgrade to 576K, following the DK'Tronics standard without support of C3 mode (like many other RAM expansions)
- second SRAM: upgrade to 640K (128K SRAM) or 1024K (512K SRAM)
- C3 RAM banking supported if both SRAMs are fitted
- easy to assemble, all through-hole components
Status: in active development
paused / abandoned
CPC iRAM/1088
- for CPC 6128 only
- 1024K expansion
- total accessible RAM of 1088K in a 6128 (64K Base RAM + 1024K RAM expansion)
- easy to assemble, but some SMD components due to size constraints in the CPC 6128
Status: Prototype successfully tested. No final PCB yet. Might be resumed if there's demand.
CPC 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 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: currently on halt as CPC iRAM/1024 will fit into all 464s and 664s and is more flexible