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I managed it to downgrade a Turbo PASCAL (5.5) Source of a Z80 Assembler to a Turbo PASCAL 3.0 version...  
Saturday, January 24, 2009, 11:00 PM
Posted by Administrator
... and it can be compiled on DOS error free. Now I tried it on CP/M 3.0 and guess what happens ?

It was too big, over 50KB size was too much for the Compiler. So I was reminded on these days and the size limitations suddenly again :-(

I am sure it can be stripped from all comments, and also from unnecessary blanks inside the source file, and then it will work even with CP/M again.

Now somebody can ask for the reason I tried this. There are many Z80 Assembler available, and many are very useful and runs smooth.
But there are no source code version of these Assembler available, and even if so, they are written in assembler also, a few in C. But so far I didn't found any source code for Turbo Pascal 3.0, and so it was very exiting for me to get one.

I will try to publish a ready compiled version as soon as I get time to strip that source code down, under DOS (with TP 3.0) it runs already smooth.

Update: You can download the whole package from http://www.z80.eu/downloads/asmz80.zip

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Another very interesting vintage computer blog ... not very frequently updated, but good entries ! 
Tuesday, November 25, 2008, 11:00 PM
Posted by Administrator
I found surprisingly two other vintage computer blogs,
one from Howard Harte at http://hartetechnologies.com/Happenings/nfblog/
(with less entries for the present but many for 2007),
and a bigger one at http://www.bytecellar.com/,
with a bigger number of Apple II related entries.

Howard Harte describes the root (history) of CP/M and that was really interesting:
http://hartetechnologies.com/Happenings/nfblog/?p=18
You can also found some very interesting software pieces at
http://www.unix4fun.org/z80pack/
just look for "Bootable disk images with older Digital Research CP/M versions"
on that mentioned page from Udo Munk.

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Cracking an Osborne 1 into parts - interesting pictures 
Sunday, November 9, 2008, 03:22 PM
Posted by Administrator
Very interesting pictures can be found at TechRepublic - they split an Osborne 1 part by part, hopefully they assembled it back to a working unit...

http://techrepublic.com.com/2346-13636_11-193055.html

As far as I know, that's an older one, not the newer model with less rounded case corners.
The detailed pictures from the Double Density are also amazing, because later computer models didn't need such extra logic due to more intelligent microcontroller like the upd765.

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How to transfer Apple Disk Images from a modern PC to an Apple II (with a super serial card) 
Friday, October 31, 2008, 09:00 PM
Posted by Administrator
Indeed I didn't think about it yet. But it is not too difficult.
Getting an image from Asimov's site at ftp://ftp.apple.asimov.net/pub/apple_II/images/
Reading all infos at http://adtpro.sourceforge.net/
Transferring the image back to a real Apple ][.
Have fun.

Have to do it with "The Hitchhiker's Guide to the Galaxy".
Grab it at ftp://ftp.apple.asimov.net/pub/apple_II/images/games/adventure/The%20Hitchhikers%20Guide%20to%20the%20Galaxy.dsk
If the game is too difficult (you have to find the right words also), take a look into ftp://ftp.apple.asimov.net/pub/apple_II/images/games/adventure/HitchhikersGuideToTheGalaxy.txt
(Caution: Spoiler!)

To take a look into these disk images, just use Ciderpress
http://ciderpress.sourceforge.net/

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Another rare CP/M portable from Televideo... 
Friday, September 19, 2008, 12:11 AM
Posted by Administrator
Had time to search for several topics, and suddenly I found a hint about a not so well known CP/M 2.2 portable computer (less famous):

A Televideo TPC-I, not really portable (with a similar weight as the Osborne 1) but still an "all-in-one" CP/M machine.


More infos at http://home.total.net/~hrothgar/museum/TPC1/index.html

I have to collect more data about it, because there was surprisingly also a GSX-80 implementation available for this computer (this is rare).

Also, I thought about, to add info pages not only for the Televideo above, but also for the Epson PX-8 (because it was also a CP/M portable).

The pages about the Z-80 Video Pak from "Data 20 Corporation" for the C64 was also very interesting, because I collected many infos about CP/M 2.2 for the C64 already, but missed this "pearl" (but the cartridge seems to be very rare).

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