CudaSales Posted February 24, 2014 Share Posted February 24, 2014 How many RS232 and 32k Memory Cards can you put into a single PEB (Peripheral Expansion Box) that will work together? Thanks Quote Link to comment Share on other sites More sharing options...
+mizapf Posted February 24, 2014 Share Posted February 24, 2014 Two TI RS232 cards if one card is configured for the second CRU area (1500). Only one 32K memory card can be used. Quote Link to comment Share on other sites More sharing options...
CudaSales Posted February 24, 2014 Author Share Posted February 24, 2014 To configure the 2nd RS232 Card on CRU area (1500) is it a physical jumper setting or software controlled? Quote Link to comment Share on other sites More sharing options...
jens-eike Posted February 24, 2014 Share Posted February 24, 2014 It is a little more complicated than just changing a jumper: http://www.mainbyte.com/ti99/rs232/rs232.html Quote Link to comment Share on other sites More sharing options...
CudaSales Posted February 24, 2014 Author Share Posted February 24, 2014 Looks very straight forward. Thanks for the quick advice!!! Quote Link to comment Share on other sites More sharing options...
CudaSales Posted February 26, 2014 Author Share Posted February 26, 2014 I am going to be doing the RS232 upgrade this week and will be adding the switch to an RS232 card but had an issue. I noticed that the DPDT switch shown on the Mainbyte page actually looks more like a SPDT switch especially with just the 3 wires being attached to it. Can anyone verify this? Quote Link to comment Share on other sites More sharing options...
+Lee Stewart Posted February 26, 2014 Share Posted February 26, 2014 I am going to be doing the RS232 upgrade this week and will be adding the switch to an RS232 card but had an issue. I noticed that the DPDT switch shown on the Mainbyte page actually looks more like a SPDT switch especially with just the 3 wires being attached to it. Can anyone verify this? That is, indeed, a mistake. It is, in fact, a Single-Pole-Double-Throw (SPDT) switch. ...lee Quote Link to comment Share on other sites More sharing options...
CudaSales Posted February 26, 2014 Author Share Posted February 26, 2014 That is what I thought based solely on the photo but I wanted to be safe before attempting the modification. Thanks for your input Quote Link to comment Share on other sites More sharing options...
+OLD CS1 Posted February 27, 2014 Share Posted February 27, 2014 That is, indeed, a mistake. It is, in fact, a Single-Pole-Double-Throw (SPDT) switch. ...lee When doing project with a SPDT switch, I like to use a DPDT so if one pole fails or has problems the other pole is (usually) still operational. Does anyone have a reason why this would be bad practice? Quote Link to comment Share on other sites More sharing options...
+Lee Stewart Posted February 27, 2014 Share Posted February 27, 2014 When doing project with a SPDT switch, I like to use a DPDT so if one pole fails or has problems the other pole is (usually) still operational. Does anyone have a reason why this would be bad practice? Can't hurt—especially, if you happen to have the DPDT switch handy. Otherwise, it does seem like overkill. How often have you had one fail, anyway? ...lee Quote Link to comment Share on other sites More sharing options...
CudaSales Posted February 27, 2014 Author Share Posted February 27, 2014 Old CS1 I see your point and it is valid. My concern would be the other 3 bare connections on that switch possibly making contact with something and zapping them. I dont know if any current goes through them so it may not even be possible. I also like the small size of the SPDT switch as it is much smaller and i will be having it coming out of the back of the card enclosure so I can switch it easily and not have to get back into the card. I know that some people leave the external casing off but I have always preferred to keep it on. Quote Link to comment Share on other sites More sharing options...
+OLD CS1 Posted February 27, 2014 Share Posted February 27, 2014 Can't hurt—especially, if you happen to have the DPDT switch handy. Otherwise, it does seem like overkill. How often have you had one fail, anyway? ...lee I have had a lot of them get "dirty" on me in the past. May have been that I bought Radio Shanty mini switches. In audio circuits they would develop a crackle when barely touched. One particularly annoying semi-failure was in the stereo SID expansion I built for my 128D: the second SID would sometimes be there and sometimes not be there, often in the middle of playing. Of course I did not suspect the switch until after rebuilding the circuit and replacing the SID at which point it was the only thing I had not replaced. The kicker for non-failures was a circuit I built in which the DPDT switch sat outside exposed to rain and what-not, both poles used for different parts of the circuit. That damned thing never failed. Maybe that is what I did wrong: I never left my computers out in the rain. Quote Link to comment Share on other sites More sharing options...
+OLD CS1 Posted February 27, 2014 Share Posted February 27, 2014 Does anyone happen to know off-hand the measurements of a PEB? Both of mine are in storage for the short-term and I cannot find any dimensions online. Quote Link to comment Share on other sites More sharing options...
CudaSales Posted February 27, 2014 Author Share Posted February 27, 2014 17 1/4" Wide x 11 1/2" Deep x 7 1/4" Tall Quote Link to comment Share on other sites More sharing options...
+OLD CS1 Posted February 27, 2014 Share Posted February 27, 2014 17 1/4" Wide x 11 1/2" Deep x 7 1/4" Tall Thanks. I have an old 19" telco rack that I am working on putting all of my stuff on. The PEB will fit nicely. 1 Quote Link to comment Share on other sites More sharing options...
Omega-TI Posted February 27, 2014 Share Posted February 27, 2014 Thanks. I have an old 19" telco rack that I am working on putting all of my stuff on. The PEB will fit nicely. PHOTOS WHEN IT'S DONE........ pleeeeeeeease! Quote Link to comment Share on other sites More sharing options...
CudaSales Posted February 28, 2014 Author Share Posted February 28, 2014 In order to connect 2 PEB's to 1 Console, is there some type of splitter/Y Cable to connect both Flex Cables to and if so, where can they be purchased? Thanks Quote Link to comment Share on other sites More sharing options...
Willsy Posted February 28, 2014 Share Posted February 28, 2014 Yes there is. Bob Carmany uses his TI with two PEBs connected at the same time. There are restrictions. Only one box can have a 32K memory expansion (obviously). Running the same cards across the boxes can cause CRU conflicts, just as it would with two identical cards in the same box. Quote Link to comment Share on other sites More sharing options...
+OLD CS1 Posted February 28, 2014 Share Posted February 28, 2014 Yes there is. Bob Carmany uses his TI with two PEBs connected at the same time. There are restrictions. Only one box can have a 32K memory expansion (obviously). Running the same cards across the boxes can cause CRU conflicts, just as it would with two identical cards in the same box. I am assuming Bob has some kind of massive setup which requires the use of two boxes? Or what this just for fun? How does he have them connected? Quote Link to comment Share on other sites More sharing options...
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