bbc-b/fpga-bbc - bbc-b fpga implementation from GH

	Commit message (Collapse)	Author	Age	Files	Lines
*	Added sound generator support and interface to WM8731L audio codec. Uses ↵	Mike Stirling	2011-07-31	1	-0/+123
\| \| \| \|	SN76489 implementation from FPGA arcade.
*	Added pin definitions for SD card interface. Fixed bug in 6522 ↵	Mike Stirling	2011-07-31	1	-5/+19
\| \| \| \|	shift-register implementation (shift on CB1 rising edge should occur even in SR disabled mode). Works with MMBEEB SD card interface ROM.
*	Keyboard now working (needed to loop back slow bus outputs to inputs on ↵	Mike Stirling	2011-07-30	1	-18/+31
\| \| \| \|	system VIA). Added aux input to debugger for display of arbitrary hex values. Removed test IFR output from 6522
*	Work in progress. Added PS/2 keyboard interface, hardware debugger. ↵	Mike Stirling	2011-07-29	1	-71/+186
\| \| \| \|	Interrupt test output to 6522 (remove later). Fixed error in pin assignments that blocked access to Flash chip select. Added reading sideways ROMs from external Flash (all but BASIC masked off for now).
*	Boots to "BBC Computer" message with dummy keyboard and interrupts disabled ↵	Mike Stirling	2011-07-25	1	-50/+113
\| \| \| \|	(something is keeping the interrupt permanently asserted). Need to add paged ROMs in Flash (no more room in the FPGA).
*	Work in progress: Added MOS6522 from www.fpgaarcade.com. Added simple_uart ↵	Mike Stirling	2011-07-17	1	-14/+313
\| \| \| \|	component in "FRED" for test purposes and added alternative EHBASIC ROM for debugging
*	Fixed SRAM routing logic	Mike Stirling	2011-07-16	1	-2/+16
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*	Added top-level, PLL, MOS ROM and CRTC. CRTC seems to behave strangely ↵	Mike Stirling	2011-07-16	1	-0/+563
	although the design is passing timing.