SAM Dallas module
Hi Folks, I tried emailing Edwin about this, but all email addresses I found for him simply bounced. So I'm posting here instead... Does anyone have programming information for Edwin's SAM Dallas clock module? Particularly the port addresses and how to read/write to the Dallas 114-bytes of scratch-ram? Also, does Simcoupé save the Dallas module's RAM contents on exit - thus emulating the persistent qualities of the Dallas scratch-ram? Cheers, Chris.
RE: SAM Dallas module
Chris Pile wrote: I tried emailing Edwin about this, but all email addresses I found for him simply bounced. So I'm posting here instead... The last one he used on the list is edwin.blinkathome.nl - if he doesn't spot this I'll check when he's next on MSN. Does anyone have programming information for Edwin's SAM Dallas clock module? Particularly the port addresses and how to read/write to the Dallas 114-bytes of scratch-ram? Try this for the data sheet: http://www.embeddedarm.com/downloads/Components/12887.pdf Clock.cpp in the SimCoupe source might also help: http://tinyurl.com/y8b53s The original DALLAS has 128 bytes of nvram, with the bottom 14 used for clock values. Reading and writing the full 128 range is done in the same way, with the RTC updating the lower ones automatically. Bit 8 of the port address is 0 for register select and 1 for data. So writing 123 to port 00EF would select location 123 in RAM, then writing a byte to port 01EF would write it to that location in nvram. For the current (original) chip only the bottom 7 bits of the location are used, but the new chip support I'll add will use all 8 bits. Also, does Simcoupé save the Dallas module's RAM contents on exit - thus emulating the persistent qualities of the Dallas scratch-ram? Not currently, as I didn't realise that worked with the original device. I can implement that tonight if you want something to play with. :-) Si
Re: SAM Dallas module
Chris Pile wrote: Hi Folks, I tried emailing Edwin about this, but all email addresses I found for him simply bounced. So I'm posting here instead... Does anyone have programming information for Edwin's SAM Dallas clock module? Particularly the port addresses and how to read/write to the Dallas 114-bytes of scratch-ram? Also, does Simcoupé save the Dallas module's RAM contents on exit - thus emulating the persistent qualities of the Dallas scratch-ram? Chris.. Hope you are all well. Steve Parry-Thomas is more likely than most to know how to contact Edwin. Regards Wayne... -- --- Wayne M Weedon Email: [EMAIL PROTECTED] Fdos Design Poole UK Tel +44-1202-677025Fax +44-1202-770515 Mobile: 07774 439915 Specialists in small batch Production Mechanical/Electrical Engineering ---
Re: SAM Dallas module
Hi Si, Chris Pile wrote: I tried emailing Edwin about this, but all email addresses I found for him simply bounced. So I'm posting here instead... The last one he used on the list is edwin.blink at home dot nl - if he doesn't spot this I'll check when he's next on MSN. No problem. I won't need to bother Edwin now, as all I wanted was the port address for the Dallas chip. You kindly supplied that in your reply! I had recollectrions of the address / data accessing of the chip from way back - when I played around with PC CMOS stuff. Ports 112 (address) and 113 (data) sprang to mind! Strange the silly things people tend to remember! :-) Chris Pile wrote: Also, does Simcoupé save the Dallas module's RAM contents on exit - thus emulating the persistent qualities of the Dallas scratch-ram? Not currently, as I didn't realise that worked with the original device. I can implement that tonight if you want something to play with. :-) :-) That would be great. No rush though, as I can't really start playing until the weekend. Cheers, Chris.
Re: SAM Dallas module
Hi Wayne, Chris.. Hope you are all well. Steve Parry-Thomas is more likely than most to know how to contact Edwin. You were quite right! Steve emailed me Edwin's address. However, I won't need to bother him now, as all I wanted was the chip's port address. Which I now have! :-) Cheers, Chris. P.S. I'll email you properly soon... Or should that be soon-ISH. You know what I'm like for that... ;-)
