Rick Stevens wrote: > Mikkel L. Ellertson wrote: >> Jim wrote: >>> Rick Stevens wrote: >>>> Patrick O'Callaghan wrote: >>>>> On Wed, 2009-04-08 at 15:27 +0000, g wrote: >>>>>> Patrick O'Callaghan wrote: >>>>>> >>>>>>> ttys >>>>>> 'b-'. you did not answer which model and usage of paper. :) >>>>> asr33, paper scroll :-) >>>> ASR33s also had the paper tape punch and reader. KSR33s did not. I >>>> had both hooked up to my Altair 8800 back in '77 via 110 baud, 20mA >>>> current >>>> loop serial interfaces. >>>> >>>> Ah, memories! >>>> ---------------------------------------------------------------------- >>>> - Rick Stevens, Systems Engineer ricks@xxxxxxxx - >>>> - AIM/Skype: therps2 ICQ: 22643734 Yahoo: origrps2 - >>>> - - >>>> - Polygon: A dead parrot (With apologies to John Cleese) - >>>> ---------------------------------------------------------------------- >>>> >>> ASR33 on a Altair, that far back, You must be at least 100, I started >>> out on a RCA 1802 8 bit and I still have it. >>> I modified it to work on S100 bus so I could get more memory , 64k , man >>> you were top dog with that kind of memory. >>> >> Maybe he was talking about an Altair 8008. Intel 8080 processor, >> S-100 bus, front panel with status and data LEDs. Address/data >> toggle switches, and a few control toggles. > > No, an Altair 8800 (from MITS...Micro Instrumentation Telemetry > Systems). IMSAI had the IMSAI 8080 (from IMS Associates, Inc.). Bet > you didn't know the actual names of the companies, did ya? :-) > I did at one time, but my memory isn't as good as it used to be. (At one time, I could even toggle in the paper tape loader in binary from memory.) > The Altair's front panel was set up with toggle switches in an octal > (3-switch gang) format on a metal front panel. The IMSAI had paddle- > style switches (a'la PDP-11s) in a hex (4-switch gang) format on a > Plexiglass front panel. I had both machines, along with a Processor > Tech SOL-20 and a PolyMorphic Systems' Poly-88 > The kit I had had SPST toggle switches for data/addresses. The lower 8 address switches were also used for entering 8 bit data. Things like deposit/deposit next were SPDT center off spring-loaded toggles. The If I remember right, the run/stop/step was spring-loaded for step, but not for run. There were LEDs for data, address, and status. The front panel was tied into the S-100 backplane. The CPU had its own S-100 card. The memory was another S-100 card, and I/O was a third card. > They all had Intel 8080 or 8080A CPUs (well, the SOL-20 had an AMD > 9080). All were S-100 bus format. The Altair had an 18-slot > motherboard (in separate 4-slot chunks you had to jumper together with > INDIVIDUAL wires), the IMSAI had a single, 22-slot motherboard. The > Poly-88 had a single 6-slot motherboard, the SOL-20 had a 4-slot > expansion S-100 expansion bus (the CPU and all I/O were on the main > board, similar to what we have now). All of them were kits (I melted a > HELL of a lot of solder back in those days). > >> Toggle in the paper tape loader in binary. Then load the system >> monitor/program from paper tape. I remember loading an assembler >> from paper tape, and then feeding the program source from another tape. > > I had several different EPROM boards with primitive monitor programs > (think the old ODT program on DEC PDP-11s) At that time, EPROMs and EPROM programmers were beyond my budget. It was all I could do to afford the 4k memory card. (That changed later...) Mikkel -- Do not meddle in the affairs of dragons, for thou art crunchy and taste good with Ketchup!
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