It was set up on the workbench hooked to my FPGA disk tool in order to read and write to the drive in a controlled way. The IBM 1130/2250 computer system and graphic display was IBM's lowest cost system (when it was released in 1965) and was intended for the technical and engineering market.
We saw that the signal was weaker and less distinct, so much so that the limiter and clipper circuits could not restore them to full ranges swings between the op amp rails. Date 1970 Publisher Digital Scientific Corporation Identifying Numbers. We will swap the remaining two boards that should have nothing at all to do with read/write operations, just to eliminate all possible circuitry on boards. My documentation will shift to focus upon the high level behavior, although I will still retain my stack and variable dictionary shorthands.
Entries that are defined by : and ; bracketing a string of words will establish a dictionary entry in the name of the first word, then in the variable entry will store the remaining words, separated by blanks, up to an including the trailing ; character. the IBM 1132 Printer. The 2650 is very closely based on the IBM 1130 mini-computer released in 1965. We swapped all the circuit cards from a working Diablo drive to determine if we had failing logic on those cards, but the results were unchanged. When we attempted to read the image back that was just written, the reading attempt encountered a huge number of checksum errors. Hi Dwight. Taking a cartridge which was corrupted by the demon drive, we watched what was being read by the heads as the cartridge spun around.
It printed 120 character lines at 80 lines per minute. Ken chose to name the antique version of FORTH as Proto-FORTH, which I love.
Bob Flanders and I have been examining the running FORTH on the 1130, looking to validate its operation and learn to use it. I t also describes the me-chanical and electrical principles involved in per-forming these operations. That will make life easier as we continue exploring original FORTH.
Type Document. The remaining words are compiled immediately into 1130 machine instructions, set up as a callable subroutine. There are two results of these statements - changes to the stack and additions to the variable dictionary -- so I extended normal FORTH shorthand for documentation. The behavior is the same on workbench and Alto, so we can eliminate the 15V supplies. I discuss any unusual aspects in the text below that shorthand. For the text saved entries (those defined with :;) I have to see that entry used in a code block before it is actually compiled. Then, we will instrument the drive to see what it is doing during write operations.