ZX Prism

This blog aims to follow the development of my FPGA based Spectrum Compatible computer. The ZX Prism should remain compatible with the ZX Spectrum whilst expanding its graphics and memory.

Saturday, March 24, 2012

Not dead, just resting!

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Apologies for the lack of recent updates. Since the last update I've spent a lot of time rewriting the VGA handler so that it better mat...

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Monday, September 19, 2011

Integration

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Much recent development on the ZX Prism has been to integrate the video modes from the orignal (48K) Prism development into the new 256K one...

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Wednesday, September 7, 2011

A matter of contention

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Once interrupts were fixed, I turned my attention to emulating the Spectrum's floating bus. Basically, I keep a copy of the last byte re...

Sunday, September 4, 2011

Interrupts...

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This last week has seen me working with interrupts of various types. Firstly, the literal. Mike Stirling released a new version of FPGASpe...

Tuesday, August 23, 2011

Paletted 256 colour mode

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ZX Prism currently has 3 different screen modes. The first is, of course, the standard ZX Spectrum mode (256x192 pixels, 8 colours, 2 per 8x...

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Sunday, August 21, 2011

Clocks

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One other major thing that has changed recently in ZX Prism is the master clock frequency. Mike's original FPGA Spectrum source derive...

Mode switching

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Recently, I've been doing a number of tests of different attribute byte decoding schemes, but of course the ultimate goal has always bee...

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