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documentations:hardware:to8 [2014/03/25 20:17] – created pulkomandy | documentations:hardware:to8 [2015/03/01 16:31] (current) – [Memories] pulkomandy | ||
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==== Frequencies ==== | ==== Frequencies ==== | ||
* 6809E CPU at 1MHz | * 6809E CPU at 1MHz | ||
- | * 1 "page mode" gate array chips at 16MHz | + | * 1 "page mode" gate array chip at 16MHz |
==== Video ==== | ==== Video ==== | ||
* 50Hz or 60Hz frame rate | * 50Hz or 60Hz frame rate | ||
Line 27: | Line 27: | ||
* Output to audio pins of SCART port (mono) | * Output to audio pins of SCART port (mono) | ||
==== Memories ==== | ==== Memories ==== | ||
- | * 256KiB RAM | + | * 256KiB RAM split into 16 pages of 16K each |
- | * 16KiB screen RAM | + | * 16KiB screen RAM (CPU has a fixed mapping to page 0, but the video logic can use pages 0 to 3) |
- | * 16KiB " | + | * 16KiB " |
- | * 224KiB | + | * All pages can be mapped to the "RAM page" area or the " |
+ | * RAM expansion | ||
* 80KiB ROM | * 80KiB ROM | ||
* 16KiB system and disk ROM | * 16KiB system and disk ROM | ||
* 32KiB for BASIC 128 and EXTRAMON | * 32KiB for BASIC 128 and EXTRAMON | ||
* 32KiB for BASIC 1.0, boot screen, and icon DOS | * 32KiB for BASIC 1.0, boot screen, and icon DOS | ||
+ | |||
< | < | ||
==== Mass storage ==== | ==== Mass storage ==== |