Texas Instruments TMS2600

[Marvin Johnston]

I took a look in a 1977 IC Master and they show the TMS2600 as
discontinued. However they show alternate sources as an AMI S8773 and
National MM4230 and MM5230.

BUT, the First Edition of "The Integrated Circuits Catalog for Design
Engineers" from TI has the TI datasheet and specs starting at page
14-139. Pinout:

1  - A3     13 - A9
2  - A2     14 - CS
3  - A1     15 - MC
4  - B1     16 - Vgg
5  - B2     17 - A8
6  - B3     18 - A7
7  - B4     19 - A6
8  - B5     20 - A5
9  - B6     21 - A4
10 - B7     22 - NC
11 - B8     23 - NC
12 - Vss    24 - Vdd

A - input
B - output
MC - Mode Control
CS - Chip Select
Vdd - drain power supply
Vgg - Ground power supply
Vss - Substrate

Supply voltage Vdd - -12V nominal
Supply voltage Vgg - -24V nominal
Input chip select logic 1 - -12V nominal
Input chip select logic 0 - 0V nominal
input pulse width - 650 ns minimum

"A logical 0 on the chip select input will cause the outputs to become
open circuits on the "single-ended" (open drain) type output buffer and
will cause the outputs to go to Vdd on the double-ended (push-pull) type
output buffer.


> I've recently acquired an old Wang 144T programmable electronic calculator.
> Early '70's technology.  Uses a lot of 7400-series TTL, along with some
> older
> DTL.  It is a microcoded machine, using a Texas Instruments TMS 2600 2K-bit
> Mask Programmed ROM for the microcode store. I want to try to capture the
> content
> of the ROM, but I've not been able to find a pinout and specifications for
> it anywhere.