http://simonowen.com/blog Stuff and nonsense Wed, 12 Dec 2007 08:12:12 +0000 http://backend.userland.com/rss092 en The SAM port of uIP seems to be on hold at the moment, so I've been looking at other IP stacks to use until it's ready. The most appealing is Mark Rison's CPC/IP, not least because it's written in Z80 and should work without extensive changes. It also ... http://simonowen.com/blog/2007/12/11/samip/ After a break of a few of months, I'm almost back on the development wagon. I did the odd project tweak during that time but haven't spent any quality time working on new features. Last month I picked up one of the first Quazar Trinty boards. Since then I've ... http://simonowen.com/blog/2007/11/30/trinity-ethernet/ The attribute port (255) is part of SAM's Spectrum compatibility, and implements a quirk of the original hardware. On the Spectrum it returns the last value on the ULA side of the bus -- an attribute byte over the main screen or 255 during the border. A handful ... http://simonowen.com/blog/2007/08/04/attribute-port/ With Edwin's help, I've just finished adding Atom Lite 1.x support to both SimCoupe and SamDisk. The new interface is a simplified version of the original Atom HDD interface, and is now primarily for Compact Flash use. The Atom Lite uses an ATA feature for 8-bit data accesses, rather than ... http://simonowen.com/blog/2007/06/25/atom-lite-cf-support/ I've updated SAM SID Player to version 1.1, addressing some issues with the original version: Updated 6502 core The recent core enhancements mean it's now possible to trap SID writes from all instructions, without the need for hard-coded checks. Control register re-triggering now works correctly in all tunes rather than just ... http://simonowen.com/blog/2007/06/07/sid-player-v11/ I've now done the bulk of the work needed for SimCoupe's AVI recording feature, using 8-bit MS RLE encoding as planned. It gives lossless video and (optionally) audio recording at up to full framerate, and should be no problem for most systems to handle in parallel to the emulation. ... http://simonowen.com/blog/2007/04/24/avi-recording/ This will probably be my last emulator for a while so I can return to normal projects. I'd wanted to emulate the Apple 1 for quite a while, and didn't think it should take more than a couple of hours to make a usable emulator. The Apple 1 is a ... http://simonowen.com/blog/2007/03/19/apple-1-emulator/ This emulator started as a quick test of my 6502 core, to see if it could run the Orao ROMs. I half expected it to fail due to lack of decimal mode or interrupt support, neither of which were implemented in the SID player core. It took just ... http://simonowen.com/blog/2007/03/05/orao-emulator/ I've spent most of the last week porting Tomaz Kac's Galaksija emulator from Spectrum to SAM, with version 1.0 now available on my site. Basic SAM support was trivial, requiring just an OUT to LMPR to page in the ROMs, and another OUT to VMPR to set video mode 1. ... http://simonowen.com/blog/2007/02/21/galaksija-emulator/ I've decided to remove the non-commercial use restriction from my driver license. The original reason for having it was to prevent 3rd parties profiting from what I'm releasing for free, though in reality it's unlikely to add great value to anything. The change also frees it up for ... http://simonowen.com/blog/2007/02/11/fdrawcmdsys-license-update/