ULA

Shortlog

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2015-03-06 Paul Boddie files Added region blanking and display suspend notes.
2015-03-06 Paul Boddie files Added ByteDelight.com 4164 chips source.
2014-10-23 Paul Boddie files Added notes about sideways RAM/ROM access, flashing colours, and the ULA socket.
2014-04-05 Paul Boddie files Added copyright and licensing information.
2014-02-18 Paul Boddie files Added Amstrad CPC-related note.
2014-02-16 Paul Boddie files Added notes about cartridges, Econet, and region filling.
2014-02-01 Paul Boddie files Merged general changes. shedskin
2014-02-01 Paul Boddie files Added an explicit branch to track Shedskin-specific changes. shedskin
2014-02-01 Paul Boddie files Introduced a shift register abstraction for the ULA's internal state.
2013-11-17 Paul Boddie files Added Unicorn Electronics references for RAM and CPU chips.
2013-07-05 Paul Boddie files Added more RAM timing details and compared different ICs.
2013-05-26 Paul Boddie files Added a note about a possible memory filling capability.
2013-05-18 Paul Boddie files Added notes about a display suspend capability.
2013-04-28 Paul Boddie files Merged general changes.
2013-04-29 Paul Boddie files Added some clarifications about the implementation of an expanded palette.
2013-04-28 Paul Boddie files Added initial support for CPU address and data propagation.
2013-04-28 Paul Boddie files Added a note about a mechanism to allow more flexible colour output, marking the
2013-03-10 Paul Boddie files Improved the assessment of various RAM ICs, adding other product details.
2013-03-09 Paul Boddie files Added information on the RAM ICs and modern replacement parts.
2013-02-21 Paul Boddie files Added enhancement clarifications to various headings along with a
2013-01-06 Paul Boddie files Added more details about how palette data would be inverted in order to cause
2013-01-06 Paul Boddie files Described how the inversion bitmap would be used to update each flashing colour.
2012-12-22 Paul Boddie files Fixed the description of flashing colours since all logical colours can be made
2012-12-22 Paul Boddie files Added a note about flashing colours.
2012-10-30 Paul Boddie files Modelled the state of the ULA with a collection of latches instead of a counter.
2012-10-30 Paul Boddie files Added a note about increased component performance and bandwidth consequences.
2012-10-29 Paul Boddie files Updated the interpretation of how the RAM ICs are accessed by the ULA.
2012-05-03 Paul Boddie files Added display circuitry note.
2012-03-04 Paul Boddie files Added video, audio and general notes.
2012-02-26 Paul Boddie files Minor type-related change discovered through Shedskin compilation.
2012-02-26 Paul Boddie files Merged general changes.
2012-02-26 Paul Boddie files Added notes on interrupt generation and ROM paging.
2012-02-26 Paul Boddie files Simplified the logic slightly around reading and displaying pixels.
2012-02-13 Paul Boddie files Merged RAM and video changes.
2012-02-13 Paul Boddie files Introduced RAM access simulation, attempting to support the mechanism through
2012-02-10 Paul Boddie files Improved the general timing description and revised the access event timeline.
2012-02-09 Paul Boddie files Changed the description of the memory access behaviour after consulting the TM4164EC4 datasheet.
2012-02-03 Paul Boddie files Improved the timing notes, adding information about the memory access mechanism
2012-01-29 Paul Boddie files Added more timing notes to the ULA document.
2012-01-29 Paul Boddie files Fixed character attribute calculations, noting that attribute data is only
2012-01-27 Paul Boddie files Updated notes on hardware sprites and character attribute modes.
2012-01-09 Paul Boddie files Added some timing information and some general notes on system improvements.
2011-12-20 Paul Boddie files Merged general architecture-related changes.
2011-12-20 Paul Boddie files Introduced a separate video abstraction, making the ULA responsible for
2011-12-18 Paul Boddie files Null merge of general changes introducing features already present on this branch.
2011-12-18 Paul Boddie files Replaced the use of nested lists with a flat, genuine, global screen array
2011-12-18 Paul Boddie files Replaced the use of nested lists with a flat, genuine, global screen array.
2011-12-18 Paul Boddie files Changed the update function to build a new screen array on every invocation,
2011-12-18 Paul Boddie files Merged general changes.
2011-12-18 Paul Boddie files Fixed the width of the temporary surface.
2011-12-14 Paul Boddie files Added notes on alternative screen mode configurations, screen height adjustment and character attributes.
2011-12-12 Paul Boddie files Merged general changes.
2011-12-12 Paul Boddie files Moved the vertical scaling into the main program, ensuring that the ULA only
2011-12-11 Paul Boddie files Merged general changes.
2011-12-11 Paul Boddie files Replaced array usage with much simpler list operations.
2011-12-11 Paul Boddie files Removed obsolete comment.
2011-12-10 Paul Boddie files Merged general changes.
2011-12-10 Paul Boddie files Moved the application of pixel intensity to the main program, implementing it as
2011-12-10 Paul Boddie files Removed xrange usage to diagnose Shedskin behaviour.
2011-12-10 Paul Boddie files Removed array module usage since Shedskin's generated code still wants to be
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