I have posted a Netronics COSMAC ELF II for sale on Ebay. This is from a kit that I built as a teenager, and have had since. I was a bit suprised to see it...
Lee, I guess that I was referring to full-screen editors that spoil us all. Character editors can be coded to run quickly. The old CP/M editor can edit very...
Hello everyone, I have a question about the ELF IIs video output. I've posted a link to a photo of the ELF video output that is distorted horizontally. My ...
Nice Elf II. I used to have one of those with a 4k ram board and my own cassette interface and pseudo-sound board using Q. I didn't have the Giant board or the...
Ok, If my math is working right we have enough interest to break that 10 board limit. Have we worked out whether Kat will do the boards for us? The boards I ...
... Did everybody see this posting? http://groups.yahoo.com/group/cosmacelf/message/4047 After some more thought, it's starting to look to me like the 512K ...
... link ... My ... an ... Two guesses (in random order): A -- Missing a NOP ($C4) instruction in your video interrupt routine? You must have an odd number of...
... Yeap, is why I am waiting to see if we can thrash out an idea on line :) ... I do and do not agree with this point ;) I agree that it would be nice to...
It's okay Andrew! I have two Imsai's and you can't insult me about them anyway. They are about as ridiculous looking nowadays as me in a swimsuit at the beach!...
... horizontally. ... but ... of ... have ... in ... routine? ... interrupt ... control ... routine, ... too ... terminated ... borderline ... circuitry ... ...
... Do you mean 32K? Remember, you can't bank switch the memory that contains the code you're executing, and the poor 1802 has to be fetching instructions ...
Hello All, Thought I would tell, about some more about my master ROM code, That Mike mentioned earlyer. I had set it up to work with a 1 meg Rom. And the...
What if we borrow an idea from Mike and build a "mezzanine" card for the ELF 2K that plugs into the existing SRAM and EPROM sockets. This approach has a few...
There we go. That's what I was suggesting yesterday with a daughter card that uses the bus as well as plugging into dip headers where the RAM/ROM sockets are...
... Well... as an IF author and long-time Z-machine interpreter buff, the size of 512K was arrived at because a) I had some 512K SRAMs lying around from a...
What exactly is the purpose for having more memory? If it is to simulate a disk drive, maybe it would be better to use serial memory chips. For instance, a...
... Ooopss. Sorry - I must have missed that suggestion. Yes, you're right that the expansion bus would have to "pass thru" the memory card so that we could...
Lee, It sounds like fun to experiment with the serial devices at such a low cost and I would like to put a few on my next order. Have you actually tried any of...
... Not on an 1802 yet; but I have used them many times in commercial products with a variety of other CPUs; PICs, 68HCxx, and most recently, a Z80. BASIC...
Just my .02 on this one...i do not think it is a good idea to switch 32k (or 64k) pages for exactly the reasons Bob states...I think it is best to switch 16k...
... such ... Al i've used the SPI serial interface (4 data lines, 2 power) with my 1802 system to get solid-state disk type storage using MultiMedia Cards (as...
Thanks Sandy! I had browsed your site previously but didn't notice the very detailed mmc writeup. I appreciate your bringing it to my attention and I'll have...
... In case you didn't see my earlier post, the only application I am aware of is to be able to run larger Inform-based games on the 1802. The need arises...
I've been watching this thread happening, and personally can't see a use for the banks switching myself, but I was thinking about it this evening and have a ...
Bank switching just the lower half (16K) of the EPROM is an excellent idea. It's probably the best compromise of all the solutions discussed so far. It's...
You are describing pretty close to my original design, which placed the page frame from 8000-BFFF, which in essence provides for 48k of ram, with the top 16k...
Hi Guys, It looks like we have enough confirmed orders to break the 10 board minimum and we're ready to do an initial run. Before we go ahead I wanted to make...
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