30 Apr
2012
30 Apr
'12
1:42 p.m.
Eric Smith wrote:
http://www.atarimagazines.com/compute/issue11/69_1_ROM_EXPANSION_FOR_THE_CO…
The 2532 _is_ pin-compatible for reading in a PET socket that's
expecting a 2332 masked-programmed ROM. I've had several 2532s in my
PET 2001N-32 (US version of the 3032) since the late 1970s, no
adapter.
These days, it's easier to build an adapter than find real 2532s.
-ethan
? ?Bill Sudbrink wrote:
> The TMS2532 is most definitely *not* pin compatible with 2732 Data sheet claims pin compatibility with 2732.
It claims that it is "pin compatible with existing ROMs and
EPROMs (8K, 16K, 32K and 64K)", but that does not include the
2732, and their reference to 32K and 64K was only in regard to
ROMs. 
30 Apr
30 Apr
3:06 p.m.
On 30/04/2012 21:42, Ethan Dicks wrote:
I am collecting bits to build a 6809 machine and I wanted some EPROMS
for the monitor. I found I found 4 x NECD2716Ds which I am sure these
will do fine for that. I and also I think they can be programmed in a
Willem.
So that means the TMS2532JL-45 to quote the full number are available
if any one needs those specifically, for the cost of postage and a small
charge to cover my costs. I bought them in a pile of ICs for around
$7.00 so the costs are small. Note I am in the UK so it might be cheaper
to buy on US Ebay. There seem to be a few available.
Dave
G4UGM
Eric Smith
wrote:
> Bill Sudbrink wrote:
>> Data sheet claims pin compatibility with 2732.
>>
> It claims that it is "pin compatible with existing ROMs and
> EPROMs (8K, 16K, 32K and 64K)", but that does not include the
> 2732, and their reference to 32K and 64K was only in regard to
> ROMs.
> The TMS2532 is most definitely *not* pin compatible with 2732
http://www.atarimagazines.com/compute/issue11/69_1_ROM_EXPANSION_FOR_THE_CO…
The 2532 _is_ pin-compatible for reading in a PET socket that's
expecting a 2332 masked-programmed ROM. I've had several 2532s in my
PET 2001N-32 (US version of the 3032) since the late 1970s, no
adapter.
These days, it's easier to build an adapter than find real 2532s.
-ethan
1 May
1 May
12:02 p.m.
I am collecting bits to build a 6809 machine and I
wanted some EPROMS
for the monitor. I found I found 4 x NECD2716Ds which I am sure these
will do fine for that. I and also I think they can be programmed in a
Willem.
Given that uyou only need an 8 bit databus on a 6809 system, is there a
goodreson not to use a 27(C)64 for the monitor? Point being that those
ave very easy to get, every programemr will supprot them and it's only
one 28 pin chip to wire up.
-tony
2:26 p.m.
On 01/05/2012 20:02, Tony Duell wrote:
Sorry Tony,
I guess one passable reason is that I don't want to use 8k for a
monitor, although I could always program alternative monitors in 1 or 2k
segments and select with a switch.
So whilst 4 x 2716 chips are sufficient, allowing for spares etc, I
wasn't intending to use them all on the same board.
Dave.
P.S. on checking on E-Bay UK 2764s seem quite expensive compared to
2732's...
I am
collecting bits to build a 6809 machine and I wanted some EPROMS
for the monitor. I found I found 4 x NECD2716Ds which I am sure these
will do fine for that. I and also I think they can be programmed in a
Willem.
Given that uyou only need an 8 bit databus on a 6809 system, is there a
goodreson not to use a 27(C)64 for the monitor? Point being that those
ave very easy to get, every programemr will supprot them and it's only
one 28 pin chip to wire up.
-tony
2 May
2 May
12:08 p.m.
I guess one passable reason is that I don't want
to use 8k for a
monitor, although I could always program alternative monitors in 1 or 2k
segments and select with a switch.
So whilst 4 x 2716 chips are sufficient, allowing for spares etc, I
wasn't intending to use them all on the same board.
Ah, OK, that makes sense.
Dave.
P.S. on checking on E-Bay UK 2764s seem quite expensive compared to
2732's...
Last ime I looked, 27C64s were very easy to get from the normal component
suppliers and quire cheap. I've used them in preference to smaller
devices (like 2716s() because thgey were cheap and easy to get. Perhaps
things have changed now.
-tony
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