Re: Trying to cram GS/OS into a walnut

[jonINTERNETrelayCHAT@napaVALLEYnet.CLARInet (Jon Bettencourt)]

In article <20000205125855.22451.00000205@ng-bh1.aol.com>,
supertimer@aol.com (Supertimer) wrote:

> jonINTERNETrelayCHAT@napaVALLEYnet.CLARInet (Jon Bettencourt) wrote:
> 
> >If I were to make a ROM disk for the IIgs, how would I do it? Can it be as
> >big as 6.5MB? In what format should I save it in? Would it be the same as
> >an HDV file? I'm feeling like putting the complete GS/OS, plus a few extra
> >things, on there and booting off it.
> 
> There are two types of ROM disks.  Apple IIGS ROM disks and
> Apple II ROM disks.  Apple IIGS ROM disks are addressed
> through the memory expansion slot.  The ROM disk can be up
> to a little less than 8MB in size (8MB minus the amount of
> ROM on the IIGS).  I don't think there were any genuine ROM
> disks, but the RamKeeper fooled the IIGS into thinking on of
> its RAM cards was ROM.  The RamKeeper used a power
> supply and a battery to make this work.

Well, now that I know I can fit that much stuff on it, how _do_ I fit that
stuff on it?

Can I just format an HDV file, copy the files over to there, and then burn
the contents of the HDV file onto EPROM chips?

After I do that, where would I put the EPROM chips? Could I make the ROM
Disk card myself? Would it require anything in addition to the EPROMs?
What would the schematic for the card be?

After doing this, could I still put more RAM into the IIgs?

> In contrast, Apple II ROM disks fit into one of the seven Apple
> Bus slots of the Apple IIGS.  They also work on the IIe.  Such
> cards can theoretically be any size, but I do not think they
> exceeded 1MB for genuine ROM disk cards.  For the powered
> RAM cards pretending to be RAM cards, I believe the
> RamFactor with RamCharger did this.  Max size was 5MB
> (RamFactor plus piggyback expansion card) I think.
> 
> The IIGS ROM disk is much faster than the Apple II ROM
> disk.
>
> >If I wanted to make an 800K disk with just enough files to successfully
> >boot up GS/OS and access files on AppleTalk, what files would I need? It
> >would need to fit on an 800K disk (with a few bytes taken away by the
> >Mac's Desktop file). After I accessed the disks on AppleTalk, could I
> >reboot from them?
> 
> Not sure.  It would be a tight fit at best.  Did you get the disks
> I sent you?  The System 5.0.4 disk with HFS FST installed
> would let you read and write Mac 800k disks easily.

Oh, yes. Forgot about those.

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jonrelay@napanet.net                        dimension18.cjb.net
An Apple II fanatic since 1998!     S0.5 LIS+++! Suzy+++! M1987
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