home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
No Fragments Archive 10: Diskmags
/
nf_archive_10.iso
/
MAGS
/
KELSTAR2
/
KELSTARII.MSA
/
TEXT_REV10.TXT
/
TEXT_REV10.TXT
Wrap
Text File
|
1999-02-27
|
6KB
|
162 lines
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
MAGNUMST
MEMORY UPGRADE FOR STS WHICH BREAKS THE 4MB BARRIER.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
We've always been told ST TOS versions and the ST's Memory Management Unit
(MMU) cannot handle more than 4Mb but it seems the increasing system
requirements of newer applications has driven developers to come up with a
solution.
Mission impossible
So how does the Magnum card work? The cunning solution has overcome both
obstacles as follows:
The existing TOS ROMs can be replaced with TOS 2.06 which supports memory above
4Mb - by simply plugging ROMs into slots provided on the Magnum card.
Alternatively you can use MagiC v5.11 or later because it supports memory above
4Mb - in which case you do not need to upgrade TOS as well.The Magnum card
includes a supplementary MMU which manages memory above 4Mb - the original MMU
carries on managing your existing memory.
Installation
If your processor is already socketed it couldn't be easier. Plug the processor
into the Magnum card then plug the Magnum into the empty processor socket -
ideal for anyone who has already installed an accelerator! Aixit claim Magnum
is compatible with the HBS 240/640 and the PAK accelerators, AdSpeed
accelerator does not work.
If your processor is soldered to the motherboard you have two options:
Solder a socket directly on top of the processor and plug the Magnum into that.
Remove the processor and fit a socket to the motherboard then plug in the
Magnum card and processor. If you ever plan to add an accelerator this is the
best option.
Unless you intend to use MagiC exclusively there's a cable to be soldered. The
installation guide includes diagrams for the various models but these could be
a lot clearer. The connection has to be made to a PCB track connecting to the
GLUE chip pin 19, apparently the ROM 2 signal from this pin is also present on
the TOS ROM chips U4 and U7 pin 20 which might be easier to locate - check this
carefully before soldering!
PS/2 memory Single Inline Memory Modules (SIMMs) are used offering a maximum of
14Mb plus two non-contiguous 512Kb blocks
Currently STe machines are not supported - but Aixit are working on it.
Existing upgrades
I'd recommend retaining any memory upgrade already fitted because ST memory is
sometimes required. For example, the DMA system driving the Atari SLM laser
printers requires at least 1Mb. Also, apart from the HBS 640 accelerator, which
can cache up to 8Mb of TT RAM, most accelerators only cache ST RAM.
However, if your existing memory upgrade includes a connector/PCB which pushes
onto the MMU socket you may find the Magnum SIMM hits the connector/PCB and you
have a choice to make:
Retain the ST memory and use CPU sockets as spacers to clear the MMU and recase
the computer/keyboard if necessary.
Remove your existing memory upgrade, accept the limitations of less ST memory,
and avoid having to recase your computer/keyboard.
POKEing about
A disk is supplied which includes various utilities and documentation. The most
important one is a small AUTO folder program which tells TOS/MagiC to see the
Magnum memory as TT RAM. A utility is provided to modify program headers so
they are set to "Run in TT RAM" and "Malloc from TT RAM". Another utility is
used to select between a thorough, quick, or no memory check at all - and the
memory check can be skipped by pressing the [Space] bar. TT RAM is sometimes
referred to as "Fast-RAM" but the Magnum card accesses all memory at the same
speed as ST RAM, i.e. 8MHz. Apart from some other useful looking utilities on
the disk there's also a text file which hints at the possibility of burning
both MagiC and TOS 2.06 into a single pair of EPROMs - interested?
I was experiencing problems loading files from floppy disks under MagiC but
this was a bug in MagiC which is now fixed (MagiC 5.11 or later). The CDROM
driver ExtenDOS Pro also required a small tweak to its configuration file but
apart from that the extra memory seems to be highly compatible and completely
transparent in use.
Finally, I'd like to thank Peter West of the TransAction crew for translating
the installation disk and my questions to Aixit.
ST RAM TT RAM Total
---------------------
1 4 5
1 8 9
1 16 11/14# + 1##
2 4 6
2 8 10
2 16 12 + 1##
4 4 8
4 8 12
4 16 14 + 1##
# 14Mb only possible after making an additional modification
## 1Mb available as 2x512Kb upper memory blocks.
MagnumST
16/32 Systems
173 High Street
Strood
ME2 4TW
England
Tel: +44(0)1634 710788
Fax: +44(0)1634 295895
Email: 16-32@premier.co.uk">16-32@premier.co.uk
Aixit GmbH
Hansmannstr. 19
D-52080 Aachen
Germany
Tel: +49(0)241-9519230
Fax: +49(0)241-9519225
Email: sales@aixit.com">sales@aixit.com
Web pages: http://www.aixit.com">http://www.aixit.com
Cost (including VAT, P & P extra)
Magnum ST: Unpopulated £69, 4Mb £84, 8Mb £94, 16Mb £114
UK TOS 2.06 EPROMs: £54.99
68000 processor DIL: £11.60
64 pin CPU-version: £2.80
Large image files now load and there's plenty of space to run several
applications and utilities under a multitasking operating system.
MagiC 5.11 or later or TOS 2.06 needed. Keyboard might have to be moved.
Soldering experience useful.
RATED 84%
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
P.Davis.