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Forums > CSDb Entries > Release id #152591 : SD2IEC Kernal 1.0
2017-01-08 00:15

Registered: Feb 2006
Posts: 18
Release id #152591 : SD2IEC Kernal 1.0

(Moving the discussion of wedge to a forum post)

If feasible, it would be nice to get the Big Three DOS wedge commands:

@ (command channel)
/ (load ,8)
% (load ,8,1)

The browser is a nice option, but the direct route is handy as well if both can be supported.
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2017-01-10 15:37

Registered: Oct 2012
Posts: 27
I originally wrote this kernal to make my life easier when creating/testing cartridges (where you need mass storage, but do not have the module slot free). I meanwhile feel the need for a memory monitor in these cases, so I will investigate if I can fit a simple one in. Holding Run/Stop while resetting would then skip module start and directly enter the monitor.
2017-01-10 16:32
Angel of Death

Registered: Apr 2008
Posts: 175
"fit a simple one in"
And a fast-loader and a file-browser.
Where did you find all that free space?
I made a Kernal once and without serial comm and tape functionality I only managed to squeeze SJ-load for the SD2IEC (no drive-code) and a few F-key commands in.
(anyway you'd publish the source, maybe? ;) )
2017-01-10 19:00

Registered: Oct 2012
Posts: 27
:-) I decided on eload, because it is a pretty compact fastloader. The browser is the largest part with roughly 1.5 kb. Overall I was able to find 2565 bytes and I really used every available tiny segment (some are only 4 bytes) without wasting a single byte. When it is all done I am happy to share the source, although it is obviously a tad convoluted...
2017-01-10 20:11

Registered: May 2004
Posts: 646
I dont recall this but I posted the rs232 areas I used back then:
2017-01-10 21:26

Registered: Oct 2012
Posts: 27
Ah, thank you! It seems I was a bit more aggressive in kicking out RS-232 related stuff.
2017-01-10 23:12
Angel of Death

Registered: Apr 2008
Posts: 175
One thing I kept intact that if you try to access device# 1 or 2 you get an "device not present" error message.
Perhaps I lost a lot there.
2017-01-11 04:53

Registered: Oct 2012
Posts: 86
Flashed it to my EF3 as a kernal and it will be my prime choice for most SD2IEC operations from now on. It's a great kernal!

Humble requests: I would like an auto run feature from the browser so I don't have to type RUN. A simple wedge would not be wrong either. Also, an auto-detect of active device or even just a tool generate a kernal starting with your device number.. I know.. probably just one byte to change (I'm lazy). Or just give me the address and I will make the tool (I'm not that lazy after all). @%@#%.. I can hack it!

Awesome kernal!
2017-01-11 07:35

Registered: Oct 2012
Posts: 27
Thanks a lot, CRT! The address to patch for the start device number of the browser is $f422 (or byte $1422 in the .rom file). I actually expect this to stay the same no matter what I change in the kernal.

Let's see how much is left when the monitor is in, maybe the auto-run can be added (might be smaller than the wedge or function keys).
2017-01-11 08:47

Registered: Jun 2012
Posts: 23
Comment on sd2iec-devices blocking the tape port; yes, this is probably the case with most external SD2IECs, but a lot of people are also installing these inside the machine, and then all the ports are free.

I think DOS Wedge is a good idea despite the file browser. You can make use of the command channel for other things apart from browsing the directories / disk images, too.

Although, if you need the command channel shortcuts only occasionally for, let's say, configuring the sd2iec for example, you can always use the software DOS Wedge that came with 1541 demo disk.

Great idea with this KERNAL, though I haven't tried it yet :)
2017-01-11 19:27

Registered: Feb 2006
Posts: 18
Using the command channel to set up a swap list (@XS) is pretty important and a fairly frequent task. (Or does the browser support the XS function?)
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