monahan_z
Experienced Member
After 5 months in the making, I am delighted to report another new S100 board to our collection of S100 boards. This board is called the PDP-11 CPU S100 board. It incorporates the Digital PDP-J11 chip. The PDP-11 architecture is an instruction set architecture developed by Digital Equipment Corporation (DEC) during the early 1970's. It was implemented by LSI central processing units (CPUs) and microprocessors used in PDP-11 minicomputers. It was in wide use for most of the 1970s. It is a 16 bit CPU with up to 4MB of RAM addressing capability.
I use the approach I have in the past of using a CPLD to translate the PDP signals into S100 signals. This was my first exposure to programming the PDP-11 chip. I wrote as simple ROM based monitor for the board. I now see why the PDP-11 was so popular with programmers. It’s a real joy to program. Was way ahead of its time! Users can write their own assembly code and play with it.* The thing is fast too; currently I have it running with an S100 bus Phi clock of 12MHz.
Please see here for more information.
http://s100computers.com/My System Pages/PDP11 Board/PDP11 Board.htm
I anticipate a large demand for this board. Experience has thought me that keeping track of board orders is quite a time consuming task. If you would like one or more of these bare boards add your name here:
https://groups.google.com/forum/?fromgroups#!forum/s100computers
Do NOT e-mail me directly. The board is $18/board + shipping. Payment is with PayPal upon receipt of the board. I will leave the order open for only 1 week Every day or two I will update the order names on this page.
http://s100computers.com/News Page.htm
Check your name appears here a few days later. Only orders on this page will go out. The boards will be done (two layer boards) by PCBCart (China). Should take 3-4 weeks. If you have not ordered a board before I will contact you later for a shipping address.
Paul Birkel is also putting together a bulk order for the KDJ11 chip. Search this forum for more info. Paul can you update details.
I want to point out two things. First this is not a simple S100 board and is definitely not for beginners. The components are expensive (the J11 chip costs ~$60-$100 alone). The GALs and CPLD need to be programmed and for most, extensive reading about Digital Setups (hardware and Software) will be required.
Second, I have started on a PDP-11 Support board. Currently I see no reason why eventually we cannot get a Digital DL11-W + TU58 emulator on an S100 board so one could run an OS like RT11. However there are many variables and a few unknowns, it is possible this CPU board will need to be replaced by a later version.
Please read carefully the above web page before jumping into what is a long process. Fun, but a large undertaking.
John Monahan
I use the approach I have in the past of using a CPLD to translate the PDP signals into S100 signals. This was my first exposure to programming the PDP-11 chip. I wrote as simple ROM based monitor for the board. I now see why the PDP-11 was so popular with programmers. It’s a real joy to program. Was way ahead of its time! Users can write their own assembly code and play with it.* The thing is fast too; currently I have it running with an S100 bus Phi clock of 12MHz.
Please see here for more information.
http://s100computers.com/My System Pages/PDP11 Board/PDP11 Board.htm
I anticipate a large demand for this board. Experience has thought me that keeping track of board orders is quite a time consuming task. If you would like one or more of these bare boards add your name here:
https://groups.google.com/forum/?fromgroups#!forum/s100computers
Do NOT e-mail me directly. The board is $18/board + shipping. Payment is with PayPal upon receipt of the board. I will leave the order open for only 1 week Every day or two I will update the order names on this page.
http://s100computers.com/News Page.htm
Check your name appears here a few days later. Only orders on this page will go out. The boards will be done (two layer boards) by PCBCart (China). Should take 3-4 weeks. If you have not ordered a board before I will contact you later for a shipping address.
Paul Birkel is also putting together a bulk order for the KDJ11 chip. Search this forum for more info. Paul can you update details.
I want to point out two things. First this is not a simple S100 board and is definitely not for beginners. The components are expensive (the J11 chip costs ~$60-$100 alone). The GALs and CPLD need to be programmed and for most, extensive reading about Digital Setups (hardware and Software) will be required.
Second, I have started on a PDP-11 Support board. Currently I see no reason why eventually we cannot get a Digital DL11-W + TU58 emulator on an S100 board so one could run an OS like RT11. However there are many variables and a few unknowns, it is possible this CPU board will need to be replaced by a later version.
Please read carefully the above web page before jumping into what is a long process. Fun, but a large undertaking.
John Monahan
