Difference between revisions of "C't 512 KB internal RAM expansion"
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| − | Internal 512 KB RAM expansion for CPC6128 from german magazine '''c't, issue 10/1987'''. The DIY project name is '''CPC 6512'''. | + | Internal 512 KB RAM expansion for CPC6128 from german magazine '''c't, issue 10/1987''' [other source says 11/87]. The DIY project name is '''CPC 6512'''. |
One half (256K) of the total (512K) expansion memory can be accessed as Video RAM (with normal expansions, only 64 KB are accessible as Video RAM). The c't expansion is compatible with [[Standard Memory Expansions]], and provides the additional CRTC feature, but it misses 64 KB usually addressed via I/O ports &7FFC, &7FFD, &7FFE and &7FFF. | One half (256K) of the total (512K) expansion memory can be accessed as Video RAM (with normal expansions, only 64 KB are accessible as Video RAM). The c't expansion is compatible with [[Standard Memory Expansions]], and provides the additional CRTC feature, but it misses 64 KB usually addressed via I/O ports &7FFC, &7FFD, &7FFE and &7FFF. | ||
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<gallery> | <gallery> | ||
| − | Image:NoPicture.gif|c't, issue 10/1987 | + | Image:NoPicture.gif|c't, issue 10/1987 [or 11/87 ?] |
</gallery> | </gallery> | ||
Revision as of 16:46, 10 March 2010
Internal 512 KB RAM expansion for CPC6128 from german magazine c't, issue 10/1987 [other source says 11/87]. The DIY project name is CPC 6512.
One half (256K) of the total (512K) expansion memory can be accessed as Video RAM (with normal expansions, only 64 KB are accessible as Video RAM). The c't expansion is compatible with Standard Memory Expansions, and provides the additional CRTC feature, but it misses 64 KB usually addressed via I/O ports &7FFC, &7FFD, &7FFE and &7FFF.
Technical
I/O Ports are &7FC4, &7FC5...&7FF7. &7FC0 selects the first 64 KB. With this expansion the CPC can access 512 KB RAM total. With a "normal" 512 KB it can access 576 KB (64 KB + 512 KB).
Scanned Article / Schematics
c't, issue 10/1987 [or 11/87 ?]
Offtopic
The CPC 6512 c't Memory Expansion is not to be confused with issues CPC 6512 and CPC 6513 of the more popular World War II Fanzine from Concord Publications Company.
CPC 6512
CPC 6513
