Sponsored Links


  • 1. Accelerator questions.
    Need to get some questions answered. MCT Speed Demon: Does anyone know if a 2.6/2.8 mhz version of this card really existed in its first incarnation? I'm pretty sure that later ones ran at 3.58. Zip GS. I know that Zip Tech sold this card in 7,8, & 9mhz versions. Was a 10mhz available? The REALLY expensive ones that they later sold were 14's, right? (I only want to know what configuratoins Zip Tech shipped, not what people were able to upgrade to) TWGS: I know that 7mhz models were common. What other speeds were they sold as? I'm thinking that there might have been some 5 & 6mhz versions. Did AE sell 8 or 9's? I honestly can remember. My 1988 spring catalog doesn't even have the card in it. Thanks! - Paul
  • 2. Microsoft Z80 Card
    So i have an old Microsoft z80 card but had a couple of questions: 1 - Its missing a chip, U2.. According to a picture i saw on line, it appears to be a HD74LS05P. can some one verify this for me by chance? 2 - If i put it in my GS and run 80 col mode, will CP/M also work in 80 col? CP/M in 40 columns sux :) 3 - Ive googled around some, but didnt find any manual or disks to go with it online, perhaps i missed it? Pointers would be appreciated. 4 - does the apple CP/M work with SCSi drives? ( and the CFFA, if i manage to get one ) or am i stuck with just floppies? Im wanting to get back in to CP/M, and figured this was the best route since i have all the hardware ( but I never used the card since it was missing the chip from day one, about 10 years ago, so i hope it works ). So any advice is more then appreciated .. My other immediate option is to dig out my C128, but the GS is so much nicer to use. ( and i dont have a 80 col monitor for the 128 ) Question

Postby CC Rider » Sun, 05 Apr 2009 01:04:22 GMT

I was looking through the website and noted the number
of requests for various skill sets relating to ongoing projects.  For
those of us that cannot directly contribute in that way, are there any
other opportunities to help?  Research, sifting through data,
contributing legacy hardware?

I owe a lot to the Apple II and would like to help in some way


Re: Question

Postby Alex Freed » Sun, 05 Apr 2009 03:37:07 GMT

One thing comes to mind. We were thinking about creating a Mill 6809 
card as one demo configuration that is simple enough to serve as an 
example. Unfortunately the schematics we found is inaccurate or 
incomplete. Would be great to be able to borrow an operational card to 
use as a prototype. Non-destructively :)


Re: Question

Postby MdntTrain » Sun, 05 Apr 2009 04:35:18 GMT

Since I started the whole Stellation Mill-on-FPGA thing, I'd be glad
to do the work of correcting the schematic if lent a card.

Alex, I'm glad you said something as I was planning on attempting the
implementation either in FPGA or wirewrapped actual, based on that
schematic I sent you.


Re: Question

Postby Alex Freed » Sun, 05 Apr 2009 06:27:12 GMT

The problem with the available schematics is that it doesn't show what
signal controls the address buffers U12-U14. Clearly the card can't
always drive the bus. This may well not be the only error.
A high-res picture of the back of the card may help a lot.


Re: Question

Postby Steven Hirsch » Sun, 05 Apr 2009 07:29:35 GMT

Also, there is a little piggyback board that's required to run OS-9 on The 
Mill.  Would be nice to pickup that logic in the FPGA.


Re: Question

Postby John B. Matthews » Sun, 05 Apr 2009 10:02:06 GMT

In article <gr5uvh$jb5$ XXXX@XXXXX.COM >,

My schematic says:

LS367 for U12, U13, U14
note: pin 1 & 15 of LS367's connect to VMA.

Um, I'm guessing VMA isn't vanilmandelic acid or video music award. :-)

John B. Matthews
trashgod at gmail dot com
< http://www.**--****.com/ ;

Re: Question

Postby Mark McDougall » Sun, 05 Apr 2009 12:42:13 GMT

Valid Memory Address. Indicates the CPU will use the address bus in the next 


|              Mark McDougall                | "Electrical Engineers do it
|  < http://www.**--****.com/ ~msmcdoug>   |   with less resistance!"

Re: Question

Postby David Wilson » Sun, 05 Apr 2009 12:45:01 GMT

VMA is the Mill's way of avoiding the 6502's false memory accesses.

The 6809E has an AVMA (Advanced Valid Memory Access) pin and the Mill
generates VMA and /VMA signals from it. If VMA is asserted the 6809
uses the Apple bus and when it is de-asserted the 6502 gets to use it
(I think about 1 in 5 cycles on average).

P.S. I found my notes on the OS9 daughter board.

6809 -> 6502 address mapping (upper 4 bits of address modified)
0000..AFFF -> 1000..BFFF (main memory)
B000..DFFF -> D000..FFFF (language card)
E000..EFFF -> C000..CFFF (I/O cards)
F000..FFFF -> 0000..0FFF (6502 ZP, stack, text screen, 6809 interrupt

Re: Question

Postby alex.freed.007 » Sun, 05 Apr 2009 15:11:39 GMT

I suspected it was a logical place but nice to have a confirmation.

Same mapping as the MS SoftCard. And for the same reason even with a
different CPU.

One remaining issue: the links to the MILL.DSK and OS9.DSK images on
are broken. The images are not in the standard archives either. Does
anyone have them?


Similar Threads:

1.AppleLogic Carte Blanche


I tried the above mirror yesterday and got the default Apache web
page. Same thing just now. This address used to work. Does anyone know
what is going on? listed on! mirror?

Trying to collect the gno files ( and a few others too ) from, but
it seems that 1/2 the files are unreadable.. Tried 3 different FTP

Anyone know of a mirror site?

5.Attempting a mirror of Gno from

If my (ab)use of is a problem, feel free to let me know or 
ban me, I'm downloading the Gno mirror into my own Web server, it'll be a 
single hit that allows me to host a mirror myself.  My host is (  Once I've 
pruned off the various index.html pages I'll post the url to my mirror.

I have wget set to wait a random amount of time, up to 2 minutes, before 
hits, to reduce load on the server.




8. Get Free Domains .COM .NET .ORG with Free WebHosting

Return to apple2


Who is online

Users browsing this forum: No registered users and 20 guest