Feb 21, 2021 · The IBM AS/400, formerly known as System/38, subsequently known as i (sic), is remarkable in being essentially the most future-proof of all the minicomputers, thanks among other things to the use of byte code to screen programs from the CPU; this was conceptually similar to Java and .Net byte codes, but instead of being an optional extra, it ...

Perhaps a good approach might have been to construct the cartridge slot in a way that existing cartridges for the 400 wouldn't fit without modification, but manufacturers could add a notch to make the cartridges compatible with either the 400 or the 5200, or a projection that would make cartridges fit in the Atari 5200 only, depending upon ...

Jun 27, 2018 · @supercat, the 400 keyboard was fully functional, it was just “uncomfortable” to use. The 400 was my first computer and I typed in many programs from Compute and Antic on that keyboard. I wrote many of my own programs, in Basic and later Action! and C/65 and assembler. And I learned how to touch type in school so I was pretty fast.

Aug 30, 2018 · This Cray sales brochure details on page 4 that the Cray-2 uses 400 Hz power, and generates this from motors. 400 Hz power from motor generators. I'm not sure that in 1986, the state of the art used 400 Hz as a frequency for timing the signals and the circuits. I'm also not sure that if 400 Hz is needed, that motors are the best way to generate ...

May 17, 2020 · At 400 lines, it ran at 70 Hz, and at 480 lines, the refresh rate dropped to 60 Hz, which was flickery back in the time on many contemporary monitors. The 350-line EGA compatible mode ran at 70 Hz too (with longer blanking), because there was no need for higher refrehs rates at that time.

May 23, 2017 · Warner didn't seem to allow Atari Inc to sell a monitor. So there wasn't one released matching the stylings of the 400/800 or the later XL line. As mentioned in other comments, Tramiel's Atari Corp did originally intend to release composite monitors matching the XE line but unfortunately, only a few were unofficially released.

Dec 29, 2022 · That has a rather comprehensive overview of AS/400 hardware and options, from introduction up to products announced as of mid-1995. It was separated from the System Builder document, to keep size down, when the May 2000 edition of the AS/400e one was produced.

Page 1-18 of the service manual shows the Atari 400 motherboard block diagram; the keyboard speaker is connected to the CPU board via a connector jack (J106), and the circuit doesn't go through POKEY. Page 1-20 shows the same information for the Atari 800, with the same layout but a different number for the connector jack (J105).

Aug 10, 2018 · Some early computers used a membrane keyboard (ZX80, ZX81, Atari 400), or semi-membrane with minimal keys (ZX Spectrum). Not just early ones. Membrane keyboards are still made and used today, usually for industrial use, as they have inherent advantages - like every design. This is because it was cheaper than a mechanical keyboard.

Jun 5, 2016 · I've been cleaning up an Atari 400 that had a bad RF cable, and cleaned the machine thoroughly so it's looking great. It's working well apart from the keyboard, where most of the keys aren't working: some columns on the far left work ( Q , A , Z and W , S , X ) but almost everything else doesn't, and backspace even acts like reset.