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Overview
| Comment: | Clarity tweak to the --enable-savestate doc |
|---|---|
| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
8a91c994452ee9c5d6fa1782133cc182 |
| User & Date: | tangent 2019-05-15 18:29:30.468 |
Context
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2019-05-15
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| 18:34 | More --enable-savestate doc improvements check-in: 59efb347f7 user: tangent tags: trunk | |
| 18:29 | Clarity tweak to the --enable-savestate doc check-in: 8a91c99445 user: tangent tags: trunk | |
|
2019-05-11
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| 21:49 | Another systemd workaround for WSL check-in: 91ff28ae9d user: tangent tags: trunk | |
Changes
Changes to README.md.
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349 350 351 352 353 354 355 | runs the boot script you’ve selected either with the IF switches or by passing it on the command line to `pidp8i-sim` or `pdp8`. This brings the simulator up in a known state, with no persistence between restarts other than what was written to the simulated storage devices before the last shutdown. On a real PDP-8 with core memory, however, the values in memory will | | > | | | | | | 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 | runs the boot script you’ve selected either with the IF switches or by passing it on the command line to `pidp8i-sim` or `pdp8`. This brings the simulator up in a known state, with no persistence between restarts other than what was written to the simulated storage devices before the last shutdown. On a real PDP-8 with core memory, however, the values in memory will persist for weeks without power; core memory on a PDP-8 is not zeroed on power-up, unlike RAM on a modern computer. Since the CPU doesn’t start executing anything on power-up in a stock PDP-8 configuration, this means the user can toggle in a program/OS restart address with the switch register (SR), load it into the program counter (PC) with the Load Addr switch, then START the CPU to restart their program without having to reload it from tape or disk. There were also several power fail and restart options designed and made available for the PDP-8 series throughout its lifetime. One of these, the KP8-I for the PDP-8/I would detect a power fail condition, then in the brief time window while the power supply’s reservoir capacitors kept the computer running, this option card would raise an interrupt, giving a user-written routine up to 1 millisecond to save important registers |
| ︙ | ︙ |