ZX Spectrum 128: Difference between revisions
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| ram = 128kB | | ram = 128kB | ||
| rampage = 8*16kB | | rampage = 8*16kB | ||
| manu = Sinclair Research | | manu = Sinclair Research / Investrónica | ||
| volume = | | volume = | ||
| resolution = 256x192 | | resolution = 256x192 | ||
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==Paging== | ==Paging== | ||
The memory space of the Spectrum+ 128K is divided into four 16k pages. The 32k of ROM and 128k of RAM can be paged into the memory space as shown in the diagram below: | |||
<!-- table of memory pages with style based on the wikitable class --> | |||
{| style="text-align: center; border-collapse:collapse; margin: 1em 1em 1em 0;" | |||
|- style="height: 5em; background: #f9f9f9;" | |||
| style="width: 5em; background: #f2f2f2; font-style:italic; border: 1px #aaa solid;" | 0xFFFF <br />-<br />0xC000 | |||
| style="width: 5em; border: 1px #aaa solid;" | Bank 0 | |||
| style="width: 5em; border: 1px #aaa solid;" | Bank 1 | |||
| style="width: 5em; border: 1px #aaa solid;" | Bank 2 | |||
| style="width: 5em; border: 1px #aaa solid;" | Bank 3 | |||
| style="width: 5em; border: 1px #aaa solid;" | Bank 4 | |||
| style="width: 5em; border: 1px #aaa solid;" | Bank 5<br />(screen 0) | |||
| style="width: 5em; border: 1px #aaa solid;" | Bank 6 | |||
| style="width: 5em; border: 1px #aaa solid;" | Bank 7 <br />(screen 1) | |||
|- style="height: 5em; background: #f9f9f9;" | |||
| style="width: 5em; background: #f2f2f2; font-style:italic; border: 1px #aaa solid;" | 0xBFFF <br />-<br />0x8000 | |||
| style="border: 1px #aaa solid;" | Bank 2 | |||
|- style="height: 5em; background: #f9f9f9;" | |||
| style="width: 5em; background: #f2f2f2; font-style:italic; border: 1px #aaa solid;" | 0x7FFF <br />-<br />0x4000 | |||
| style="border: 1px #aaa solid;" | Bank 5 | |||
|- style="height: 5em; background: #f9f9f9;" | |||
| style="width: 5em; background: #f2f2f2; font-style:italic; border: 1px #aaa solid;" | 0x3FFF <br />-<br />0x0000 | |||
| style="border: 1px #aaa solid;" | ROM 0 | |||
| style="border: 1px #aaa solid;" | ROM 1 | |||
|} | |||
<!-- end of memory map --> | |||
==Keypad== | ==Keypad== |
Revision as of 04:37, 19 November 2012
- This article is about the "toastrack" 128K model. For other Spectrum models with 128K of RAM see ZX Spectrum 128K models
Infobox: ZX Spectrum 128
Manufacturer | Sinclair Research / Investrónica |
Mfg. volume | |
CPU | Z80A @ 3.5469MHz |
ROM | 32kB |
RAM | 128kB |
as pages | 8*16kB |
Gfx Res | 256x192 |
Gfx Colours | 15 (2 per 8x8 cell) |
Hardware
- Processor: Zilog Z80A microprocessor clocked at 3.5469MHz.
- ROM: 32KB ROM, arranged in 2 pages of 16KB.
- RAM: 128KB of Dynamic RAM, arranged in 8 pages of 16KB.
- Graphics: 256 x 192 pixels, 16 colours, attribute based. See Spectrum Video Modes.
- Sound: AY-3-8912 3 channel, 8 octave Programmable Sound Generator and "beeper". Modulated onto video signal.
- Keyboard: 58 plastic keys above a rubber pad and plastic membrane. Optional editor keypad.
- I/O: Software controlled RS232 serial port. Keypad Port. Tape In (ear) and Tape Out (mic).
Timings
Paging
The memory space of the Spectrum+ 128K is divided into four 16k pages. The 32k of ROM and 128k of RAM can be paged into the memory space as shown in the diagram below:
0xFFFF - 0xC000 |
Bank 0 | Bank 1 | Bank 2 | Bank 3 | Bank 4 | Bank 5 (screen 0) |
Bank 6 | Bank 7 (screen 1) |
0xBFFF - 0x8000 |
Bank 2 | |||||||
0x7FFF - 0x4000 |
Bank 5 | |||||||
0x3FFF - 0x0000 |
ROM 0 | ROM 1 |