Standard TOS 2.06 Vs SuperTOS 2.06

[ausl8]

Does any one know the what alterations (bug fixes?) have been made to the so
called SuperTOS 2.06 as compared with Standard TOS 2.06?
Also is there a source of info re the fitting of TOS 2.06 2 ROM set into a
STFM with 6 ROM chips?

Thanks in advance.

[Coda]

1. No. Apparently its not worth trying.
2. Yes. Ask Uncle Google. IIRC it involves plugging in the chips into
two sockets (they will overhang) and then wiring in the addition pins
to various places on the motherboard.

[Rodolphe Czuba]

TOS 2.6 cannot work on ST, STF, MEGA ST, all atari with ROM space at $FC0000
to $FEFFFF (192KB).

TOS 2.6 on STE, MEGA STE, all machines with ROM space at $E00000 to $E3FFFF
(256 KB).

To use a TOS 2.6 on ST machines, you have to decode the $E0xxxx addresses
with a GAL....

I think I already told that several times here...and several years ago (in
1993) I was selling a chip named MODE2.6 to adecode and allow use of TOS 2.6
into STF & MEGA ST...

I have yet the JEDEC file...

Regards

Post by Coda
1. No. Apparently its not worth trying.
2. Yes. Ask Uncle Google. IIRC it involves plugging in the chips into
two sockets (they will overhang) and then wiring in the addition pins
to various places on the motherboard.

[Mark Bedingfield]

Post by Rodolphe Czuba
TOS 2.6 cannot work on ST, STF, MEGA ST, all atari with ROM space at $FC0000
to $FEFFFF (192KB).
TOS 2.6 on STE, MEGA STE, all machines with ROM space at $E00000 to $E3FFFF
(256 KB).
To use a TOS 2.6 on ST machines, you have to decode the $E0xxxx addresses
with a GAL....
I think I already told that several times here...and several years ago (in
1993) I was selling a chip named MODE2.6 to adecode and allow use of TOS 2.6
into STF & MEGA ST...
I have yet the JEDEC file...

Or you can do it with 3 IC's,

http://www.umrk.org/atari/tos206up.txt

I have done it a couple of times. It works well.

Post by Rodolphe Czuba

Post by Coda
1. No. Apparently its not worth trying.
2. Yes. Ask Uncle Google. IIRC it involves plugging in the chips into
two sockets (they will overhang) and then wiring in the addition pins
to various places on the motherboard.

[Rodolphe Czuba]

Sure !

If I well remember; my prototype in 1992 was done with 3 chips ;-)
One is a 74xx645 I think to decode some address bits.

Post by Mark Bedingfield

Post by Rodolphe Czuba
TOS 2.6 cannot work on ST, STF, MEGA ST, all atari with ROM space at
$FC0000 to $FEFFFF (192KB).
TOS 2.6 on STE, MEGA STE, all machines with ROM space at $E00000 to
$E3FFFF (256 KB).
To use a TOS 2.6 on ST machines, you have to decode the $E0xxxx
addresses with a GAL....
I think I already told that several times here...and several years
ago (in 1993) I was selling a chip named MODE2.6 to adecode and
allow use of TOS 2.6 into STF & MEGA ST...
I have yet the JEDEC file...

Or you can do it with 3 IC's,
http://www.umrk.org/atari/tos206up.txt
I have done it a couple of times. It works well.

Post by Rodolphe Czuba

Post by Coda
1. No. Apparently its not worth trying.
2. Yes. Ask Uncle Google. IIRC it involves plugging in the chips
into two sockets (they will overhang) and then wiring in the
addition pins to various places on the motherboard.

[Djordje Vukovic]

Post by ausl8
Also is there a source of info re the fitting of TOS 2.06 2 ROM set into a
STFM with 6 ROM chips?

It is a bit complicated- TOS 2.06 is 256KB in size and can not be simply
put instead of earlier TOS-es that were 192KB in size: there is not anough
address spaces at locations to which these chip socket are wired
(TOS 2.06 uses a different starting address). A usual solution is to
install (above the CPU) a small additional card with an address decoder
and two EPROMs for the new TOS. A bonus is that this can be made switchable,
i.e. you can select either the old or the new TOS.

There is a possibility to put the EPROMs into the existing sockets,
but an address decoder must be installed in all cases, and some additional
wiring must be connected. The decoder can be made from about 2-3 standard
TTL LS chips or some programmable logic.

Instructions can be found on the net.

cu;