Speaking of compilers for the 1802, would anybody be interested in adding 1802 support to SDCC? http://sourceforge.net/projects/sdcc This is a C compiler that...
Allison, Comments are below ... I tried to use the DMA mode at one point, and could not get it to run reliably...I will have to dive deeper into the IDE specs...
Hellp Mike, Good to see this site is back up. DMA in general I advocate it for systems as it unloads the cpu. In the case of the 1802 it really doesn't and...
Allison, When I was working on floppy code, i had investigated DMA here, and simulated it worked, and therefore should work on real hardware as well, The FDC...
When I was doing it last (1802/FDC) it was 8" DSDD 1mb floppies so that was a while ago. The average 16uS/byte rate isn't slow and there are a few micros out...
Allison, I have done some preliminary work on supporting floppies, and somewhere have a chart of the timing needed for various data rates. The higher data rate...
Hi, The elf at least under 2mhz is not fast enough to run a DMA for superfast floppy. At higher clocks it does it well. The latency is worst case a 3cycle...
To anybody who is interested, I have uploaded a version of DiskTool adapted for use on Windows. This can be found in the ELFOS folder on this site. Many many...
It's known to work on NT/2K/XP platforms and, as Mike says, it'll require Administrator privilege to gain physical access to a drive. I don't know whether...
... I did a DMA interface circuit for an ATARI 800 disk format using my VIP. My calculations showed that there were cycles to spare in a big way. I think that...
Never said DMA was not a virtue of the 1802. Used one for that because it was both smart and did DMA. However 8" DD is 16uS (13uS worse case), and 1.44mb 3.5...
That's a pretty impressive use of an 1802. The proverbial throw a microcontroller at it solution. 1802's were rather good at such things compared to other...
... At the time I'd done this I'd also used Z80 and 8085 to do the same thing. The 8051 back then was new and not fast enough to do PIO at the required rates....
... Hughes Aircraft second sourced the 1802, and their HMDS development system was an S-100 computer with (mostly) generic S-100 boards. It had two CPU boards ...
And only $1,998, at that! Amaze your friends! Check it out: < http://cgi.ebay.com/ws/eBayISAPI.dll? ViewItem&item=8710370508&ssPageName=ADME:B:EF:US:1> Crazy,...
Happy Holidays all!! I hope that next year will bring as much excitement to this group as the last year has! May Santa bring you lots of 1802 related...
Gosh...!! An 1802 discussion group. And here was I was just idly searching on "ELFII" thinking there cannot be many left in the world. I built my ELFII in...
Hi everyone, I've been away from this forum for a long time. Just thought I would drop a line and say Happy Holidays to all. Re that 1801 Chip Set, it's...
Paul: Welcome aboard. I too had an Elf II back in the day and learned a lot from it. It's sort of amazing how the machine appealed to coders and hackers. If...
HELP! What assembler is used to build the bios (ELF2K flavor)? Is there a DOS version? Reason I'm going with a ram/rom disk as my planned app is not anywhere...
I was afraid of that. That may be the assembler and even a nice one but, I've yest to find a dos or winders C compiler that doesn't choke on it. No handy *nix...
Bill et al Many thanks for the warm welcome. My ELFII has indeed re-awakened now after at least 25 years in store. To mark this auspicious occasion right at...
Hi Paul, Great to see the pictures of your ELFII. My first micro was an ELFII back in high school. I had a 4k ram board but didn't expand it much further than...
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