22 Jul
2024
22 Jul
'24
6:04 p.m.
Hi all!
Me and my buddy are building an Apple I replica, for now successfully.
Recently we have tested the video signal :) However, we are having big
problems (as you can imagine) with finding Signetics 2519 chips. I know
many ordered them in bulk, so I would be thankful for any help (we have US
address) or information.
As for the other components, the 74160, 7450 and DS0025C are the blockers
at this moment. These we would probably find much easier (already did
actually, just looking to maybe get them from the same source).
Thanks in advance,
Igor
22 Jul
22 Jul
7:41 p.m.
On Mon, Jul 22, 2024 at 9:05 PM Igor via cctalk <cctalk(a)classiccmp.org> wrote:
Me and my buddy are building an Apple I replica, for
now successfully.
Recently we have tested the video signal :) However, we are having big
problems (as you can imagine) with finding Signetics 2519 chips. I know
many ordered them in bulk, so I would be thankful for any help (we have US
address) or information.
If more than one 2519B pop up for less than the crazy eBay prices, I'm
interested. I have a Willegal Apple 1 board that I am still sourcing
parts for (esp 2519B and 2504/1404)
I am not worried about date codes or exact package styles or markings
(N vs P etc.) I just want it to work. In the short term, I'm
definitely willing to consider a board with 6x4557 programmable chip
registers, but that still leaves the 8-pin shift registers.
-ethan
23 Jul
23 Jul
1:55 a.m.
On 2024-07-22 8:41 p.m., Ethan Dicks via cctalk wrote:
On Mon, Jul 22, 2024 at 9:05 PM Igor via cctalk
<cctalk(a)classiccmp.org> wrote:
You can't find lose parts, but you still seem to be able to find kits
https://unicornelectronics.com/Apple1/apple1.html
Ben.
Me and my buddy are building an Apple I replica,
for now successfully.
Recently we have tested the video signal :) However, we are having big
problems (as you can imagine) with finding Signetics 2519 chips. I know
many ordered them in bulk, so I would be thankful for any help (we have US
address) or information.
If more than one 2519B pop up for less than the crazy eBay prices, I'm
interested. I have a Willegal Apple 1 board that I am still sourcing
parts for (esp 2519B and 2504/1404)
I am not worried about date codes or exact package styles or markings
(N vs P etc.) I just want it to work. In the short term, I'm
definitely willing to consider a board with 6x4557 programmable chip
registers, but that still leaves the 8-pin shift registers.
-ethan 
8:24 a.m.
On 7/22/24 21:41, Ethan Dicks via cctalk wrote:
On Mon, Jul 22, 2024 at 9:05 PM Igor via cctalk
<cctalk(a)classiccmp.org> wrote:
> Me and my buddy are building an Apple I replica, for now successfully.
> Recently we have tested the video signal :) However, we are having big
> problems (as you can imagine) with finding Signetics 2519 chips. I know
> many ordered them in bulk, so I would be thankful for any help (we have US
> address) or information.
I would think that a Xilinx 95xx CPLD could be programmed to
do this job. The chip doesn't have a lot of pins. The
XC95288XL has 288 FFs, so it can do the job (the 2519 has
240 FFs.)
You could also probably use a small FPGA to do this as well.
They usually have more FFs per cell than CPLDs.
Jon
152
days inactive
152
days old
3 comments
4 participants
participants (4)
-
ben -
Ethan Dicks -
Igor -
Jon Elson