Amiga 1000 Kickstart Eproms/Roms

[CLS2086]

Hum, it sounds interesting to rebuild some of these adapters !

[Zac67]

I think I remember the 4 sockets being two pairs with different pinouts each for different chip types (mask ROM vs. EPROM).

[amigaksi]

>There are two articles which cover installing Kickstart EPROMs in 2-layer A1000 boards. There are several different methods, two of which remap the old Kickstart WOM/RAM to $F80000 (you use an AddMem program to manually add the memory at $F80000-$FBFFFF).

Does it state anything about the type of EPROMs supported by standard A1000 motherboards-- 27C256 or 27C512 or both?  

I was thinking that even if you have only two EPROMs on a standard A1000 motherboard, as long as they have the extra address line (A15), it should be possible to losslessly compress the KS 1.1 (at least) into the 128KB EPROM space and decompress it into the 256KB KickRAM when you boot up A1000.  Thus, you won't have to solder any new ROMs-- it would just be a simple plug and play solution.  This of course assumes, the Kickstart does not call functions in the bootstrap kickstart in the EPROMs while loading Workbench.

The Decompressor would have to fit into the same space as the compressed KS EPROMs.

[eroom]

Just got round to reading this thread and after a bit of digging found this which you may be interested in

http://amigahardware.mariomisic.de/cgi-bin/showhardware_en.cgi?HARDID=1731

Paul.

[Jeff]

I purchased (2) of the A1000 Kickstart adapters from DJBase. The adapters are TOP quality as is DJBase's knowledge and tech support.  My 1000 is now happily running 3.1.

There are a couple of simple changes to the daughter board and motherboard needed to get the adapter working. Once done you will be glad you did it. It really is a slick kit and well worth the price and you NEED his instructions.

Thanks DJBase for all of your help!

Now if I could just add an IDE68K:-D

Jeff

@eroom
It looks like one of my 1000's probably has this kit installed. Thanks for solving the mystery. I bet that special PAL would be impossible to find these days even if you made the eproms.

[TjLaZer]

I wonder what happens if you do not do this step:

Replace the 20pin PAL 16L8A-2CN chip located at U6J on the WCS daughterboard with the new chip supplied in the kit

[Piru]

@amigaksi

Indeed, compressing with LZMA (the best compressor there is pretty much):

116644 ks 1.1 ntsc
116139 ks 1.1 pal
121084 ks 1.2
120795 ks 1.3

The decompressor is very small. In my lzmaLoader I could fit a PPC executable decompressor into 3584 bytes (this includes a lot of support code too, not just the decompressor). m68k decompressor should be even smaller.

[Computolio]

I'm trying to burn an A1000 Kickstart 1.3 ROM set, and all I'm getting is a black screen and occasionally a purple or scrambled screen. I'm pretty sure I've split the ROM properly, and I've been trying every jumper combination with no success. Is there something I'm missing?

These are the default jumper settings (for the Kickstart loader boot ROM):

W1 = 1-2
W2 = 2-3
W3 = 2-3
W4 = 1-2
W5 = 1-2

And these are supposedly the settings for Kickstart in EPROM:

W1 = 1-2
W2 = 1-2
W3 = 2-3
W4 = 2-3
W5 = 1-2

Has anyone done this before? How does DJBase's upgrade work (i.e. where are the extra wires connected and how are the jumpers set)?

Do I absolutely need the new PAL to do this upgrade?

[os62]

Coincidentally, I was reading through my copy of the Commodore-Amiga 2nd Annual Developers Conference Notes (from 1986) this morning.

There are two articles which cover installing Kickstart EPROMs in 2-layer A1000 boards. There are several different methods, two of which remap the old Kickstart WOM/RAM to $F80000 (you use an AddMem program to manually add the memory at $F80000-$FBFFFF).

I'm anyone wants I can scan or type up the relevant pages. That should help a lot with your understanding of what's involved and the different options.

Would there be any chance to post this information, still?