Friesen@HIS-PHOENIX-MULTICS.ARPA (07/14/88)
Ok, now we know it is possable, but could some kind soul tell us how. I
am no hardware hacker, but if I recieve instructions detailed enough,
I'm sure my 'local Atari service center' can install the upgrade for me.
Thanks in advance
Aric Friesen
Addresses: Genie: A.FRIESEN ARPA: Friesen%PCO@BCO-MULTICS.ARPA
"Lenny, ya durned fool, ya bought an Amiga!" "Gee George, I squashed the
mouse!"
---"Of Mice and Men"hase@netmbx.UUCP (Hartmut Semken) (07/18/88)
In article <880714032327.837790@HIS-PHOENIX-MULTICS.ARPA> Friesen%PCO@BCO-MULTICS.ARPA writes: >Ok, now we know it is possable, but could some kind soul tell us how. I'll try. I did it. It's not that hard if you have a RAM board you can access like static RAM (a SRAM board or a DRAM board with local refreshing circurit). Just connect that to the adress and data bus, and provide DTACK to the DTACK line, so the GLUE chip will not issue a BUSERR. The tricky bit is the software. GEMDOS can use 4 MB, not more. The cusrom chips are the same, they can't use the RAM behind 400000 Hex (right, Atari?). A patched OS/9 works just fine. hase -- Hartmut Semken, Lupsteiner Weg 67, 1000 Berlin 37 hase@netmbx.UUCP High on a rocky promontory sat an Electric Monk on a bored horse. (D. Adams)
ralph@lasso.UUCP (07/20/88)
What a coincidence, but I just read a magazine article which discussed
this subject. I am *also* not a hardware buff so I also would appreciate
comments on the subject, in general, and on my article, in particular.
The article appeared in the French microcomputer magazine "Micro
Systemes", July-August 1988 issue. The article described the theory of
accessing more memory on a 1040 ST and then showed a printed-circuit
diagram of a circuit that they called "Super Glue" which would override
the "Glue" chip in the 11.5 Megs available over the 4 meg limit. In fact,
the circuit adapts the ST to an external G96 bus on which, I suppose, the
memory should be connected; there is *no* memory on the card, just a
couple of buffers and 3 PALs. They mentioned that certain parts of the
installation were quite delicate. In fact, when everything was assembled
they seemed to imply that the result would probably not fit back into the
ST case; they suggested buying another case.
I would appreciate any knowledgeable information on this subject. Has
anyone read this article? (I don't know how hard it is to get in the
U.S.) As always, I still (sigh!) don't get the newsgroups, just
info-atari16, so please reply directly to me. Thanx.
You do not have to reply before going on vacation -- so have fun first.
Ralph P. Sobek | UUCP: uunet!mcvax!inria!lasso!ralph, or
| ralph@lasso.uucp
LAAS-CNRS | Internet: ralph@lasso.laas.fr, or
7, avenue du Colonel-Roche | ralph%lasso.laas.fr@uunet.UU.NET
F-31077 Toulouse Cedex, FRANCE | ARPA: sobek@eclair.Berkeley.EDU (forwarded\
+(33) 61-33-62-66 | BITNET/EARN: SOBEK@FRMOP11 \ to UUCP )Friesen@HIS-PHOENIX-MULTICS.ARPA (07/31/88)
OK, this is what I found out (I am not including any rumors, I got this
info. form either "reliable sources" or my dealer, however, don't hold
me to any of this).
An ST can be upgraded over four megs. The extra memory will only fit
inside a Mega, you need a seperate case for 520's and 1040's. A company
is working on a board that goes in the Megas expansion slot that adds
more memory. And no one seems to know what kind of incampatability
problems there will be if you go over four megs.
Please add info. if you have some or correct me if I'm wrong.
Aric Friesen
Addresses: Genie: A.FRIESEN ARPA: Friesen%PCO@BCO-MULTICS.ARPA
"Lenny, ya durned fool, ya bought an Amiga!" "Gee George, I squashed the
mouse!"
---"Of Mice and Men"