From OpenCores PDP-8 page: Features In this FPGA implementation, the PDP-8 CPU can be configured to emulate the instruction execution of a PDP-8 (Straight-8), PDP-8/S, PDP-8/S, PDP-8/I, PDP-8/L, PDP-8/E/F/M, PDP-8/A, HD-6100, or a HD-6120. The...
In a previous log I said, "I'm not going to overthink this. Random selection from the chess openings is working.". Well I lied. I am going to overthink this. (Well at least think it.) Something I should have done when working on the opening moves was...
For lack of a better place, the Instructions project section gives a detailed description of the system. Last update September 25, 2018. If you would like more information on the custom Raspberry PI board that controls the system, there is another...
With the wiring complete I wrote a small program in Python to test the lights, buttons, and switches on the front panel. To be clear this is NOT the KENBAK-2/5 emulator running a program (yet). As it turns out I did have to replace one of the LEDs...
I was looking for a way to make the Excel Paper Model for the Z30 calculate the stepping points so it would be a complete model of the machine. The example shown below is for a rotor with a Ring Setting of 4, the 1 mark on the ring is set to the 4 position...
While revisiting key handler handleKeyScanCode_EE37 and back annotating scan codes into the code, I wind up with this:EE37 handleKeyScanCode_EE37: EE37 13 63 01 04 brclr bCloverKeyDown_63 1 noclover_EE3F ; true if 'clover key down' EE3B 12 61 01 C9 brset...
I have squeezed some simple instructions into a 16-byte ROM that writes 0x04 into the I/O address 0x00, and repeats (http://www.homebrew8088.com/):A: MOV AL, 04 OUT 00, AL JMP AThis is then converted into machine code (https://defuse.ca/online-x86-assembler.htm),...
In this project, instead of using a standard embedded processor and programming it to execute 3 tasks at hand (parsing HEX character stream, generating HEX character stream, and writing character stream to video RAM driving VGA), I created 3 independent...
I tried a couple of other cards and found that they have different MBR formats with no header. I noted this in a previous log. There's an offset at 0x01BE that points to the MBR. My theory is this is true for "bigger" cards. I think the reason I could...
Summary:It occurred to me that it would be useful to save some configuration in a non-volatile manner. This board and this chip does not have any conventional non-volatile storage (e.g. EE or external serial EE), but there's plenty of pages of unused...
Building a CP/M System Disk To avoid rewriting the assembler codes for ccp, bdos and cbios so that they can co-exist in the same file. I can append the i8hex files and remove the "end of file markers". To make the hex file more readable I have changed...
I'm currently working on the Python software to interface with the EC/pH/Control board and also developing the web interface. The web interface, shown below, uses webiopi. It's fairly programmer friendly and so far has been reliable. The...