Difference between revisions of "CPC iRAM"
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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 | ||
| Line 15: | Line 17: | ||
* total accessible RAM of 640K in a 6128 (64K Base RAM + 512K RAM expansion + 64K secondary RAM bank of the 6128) | * 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 | * 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. | + | * perfectly fits into a CPC 6128, even with socketed ROM or RAM. In Schneider CPC 6128 the metal shielding needs to be removed or altered. |
| − | Status: | + | Status: Released - see https://github.com/etomuc/CPC6128_iRAM-640 |
| + | == currently in development == | ||
| − | == CPC iRAM/ | + | === CPC iRAM/1088 === |
* for CPC 6128 only | * for CPC 6128 only | ||
| − | * | + | * 1024K expansion |
| − | * total accessible RAM of | + | * total accessible RAM of 1088K in a 6128 (64K Base RAM + 1024K RAM expansion) |
| + | * easy to assemble, but SRAMs are in SMD packaging (SOP32) due to size constraints in the CPC 6128 | ||
| + | * perfectly fits into a CPC 6128, even with socketed ROM or RAM. In Schneider CPC 6128 the metal shielding needs to be removed or altered. | ||
| + | |||
| + | Status: Finished, release pending | ||
| + | |||
| + | === CPC iRAM/1024 === | ||
| + | |||
| + | * for CPC 464 and 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 1024K (512K SRAM) or optionally also 640K (128K 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: final testing stage |
| − | == | + | == paused / abandoned == |
| − | === CPC iRAM/ | + | === CPC iRAM/576 === |
* for CPC 6128 only | * for CPC 6128 only | ||
| − | * | + | * 512K expansion |
| − | * total accessible RAM of | + | * total accessible RAM of 576K in a 6128 (following the DK'Tronics standard) |
| − | * easy to assemble, | + | * easy to assemble, all through-hole components |
| − | Status: | + | 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 === | ||
| Line 45: | Line 61: | ||
* 512K expansion | * 512K expansion | ||
* total accessible RAM of 512K in a CPC, following the DK'Tronics standard and support of C3 mode. | * 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 | * easy to assemble, all through-hole components | ||
| − | Status: | + | Status: Abandoned as CPC iRAM/1024 will fit into all 464s/664s and is more flexible |
[[Category:Hardware]] [[Category:Memory expansions]] | [[Category:Hardware]] [[Category:Memory expansions]] | ||
Revision as of 19:15, 1 May 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.
Contents
[hide]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
- perfectly fits into a CPC 6128, even with socketed ROM or RAM. 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/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 SRAMs are in SMD packaging (SOP32) due to size constraints in the CPC 6128
- perfectly fits into a CPC 6128, even with socketed ROM or RAM. In Schneider CPC 6128 the metal shielding needs to be removed or altered.
Status: Finished, release pending
CPC iRAM/1024
- for CPC 464 and 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 1024K (512K SRAM) or optionally also 640K (128K SRAM)
- C3 RAM banking supported if both SRAMs are fitted
- easy to assemble, all through-hole components
Status: final testing stage
paused / abandoned
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: Abandoned as CPC iRAM/1024 will fit into all 464s/664s and is more flexible
