Just for clarity IPL = Initial Program Load IMPL = Initial Machine Program Load
Sent from my iPhone > On May 8, 2025, at 15:23, Steve Lewis via cctalk <[email protected]> > wrote: > > Makes sense, IPL (instruction program load?) - how were the disk packs > initialized to indicate it was an IPL media? I assume the content to be > loaded had to be on a specific sector or of a file-type indicating it is to > be loaded on startup? And it is "boot to BASIC" (in quotes) mainly because > the operator has to do the effort of at least inserting the proper disk > (but it was a "pack", not just a single disk?) > > I assume SCP is a serial line of some fashion, to support that idea of > remote-loading of an OS or startup software? Kind-of sort of an early form > of PXE to "boot from a network"? > > > While we're here, another note: on the SCAMP, they emulated the IBM 1130's > version of APL (so I may have misspoken earlier - it wasn't an IBM S/3 they > had trouble sourcing, but rather during the SCAMP dev it was an IBM 1130 > they had trouble finding to borrow/lease). This SCAMP was the prototype > leading to the IBM 5100 (where in the IBM 5100, they switched to using an > S/360 based APL). > > > On an off-chance of any IBMers out there, I'm still looking for Kitty Price > or Patrick Smith (two known experts of the PALM processor, they wrote a > paper referring to it in 1974). In the appendix of that paper, they refer > to a "1130 PALM Simulator" (i.e. before the PALM was available to them, > someone had developed a simulator of it on the 1130). Then in the next > section, they refer to a "1130 Simulator which runs under VM/370". Finding > any of that software would be incredible. > <SCAMP/IBM_SCAMP_1of3_May1974_AnArchitecturalAndDesignOverviewOfScamp_PatrickSmith_KittyPrice_Part1.pdf > at main · voidstar78/SCAMP > <https://github.com/voidstar78/SCAMP/blob/main/IBM_SCAMP_1of3_May1974_AnArchitecturalAndDesignOverviewOfScamp_PatrickSmith_KittyPrice_Part1.pdf> >> > > > > > > >> On Thu, May 8, 2025 at 2:38 PM Henk Stegeman via cctalk < >> [email protected]> wrote: >> >> A few corrections: >> The BASIC on the S/3 model 6 was a "boot to BASIC" system. You could IPL >> BASIC from R1 >> or business SCP from F1. >> >> This BASIC system had virtual memory implemented. Real storage was 8 or >> 16k but in the >> BASIC environment approximately 54KB was available during execution. >> >> Only thing IBM did was reuse of the Psuedo machine code definition in >> the 5100. >> >> Another nice feature of this BASIC was the online helpfiles. >> >> Regards Henk >> >> >>
