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Groups > it.comp.retrocomputing > #51648
| From | "the F.O." <f.o@forward-observer.net> |
|---|---|
| Newsgroups | it.comp.retrocomputing |
| Subject | Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks |
| Date | 2019-10-22 12:53 +0000 |
| Organization | Aioe.org NNTP Server |
| Message-ID | <qomu4f$q7a$1@gioia.aioe.org> (permalink) |
| References | (4 earlier) <2a92b99c-150e-4d75-8f74-8554a16c474c@googlegroups.com> <qomj71$13t6$1@gioia.aioe.org> <qomkgj$1brc$1@gioia.aioe.org> <qoml3d$1ds7$1@gioia.aioe.org> <qommjk$1lt7$1@gioia.aioe.org> |
Il Tue, 22 Oct 2019 12:45:09 +0200, bfz ha scritto: > Dove avresti letto che la cpu dell'IBM Series/1 ha registri a 8 bit? > Sta scritto che il bussolo indirizza da 16kb-128kb di ram log(128*1024*8)/log(2)=6,0206/0,30103=20bit da cui si desume che: se ha un indirizzamento diretto sino $100000 (base16) allora ha un program counter da 20bit (ma niente si può dire su quanti bit ci siano nell'accumulatore) oppure potrebbe avere un program_counter da 16bit, che però riesce a gestire 128kb in due banchi switchabili da 64kb proprio come faceva il mio 6502, che con questo sistema, poteva gestire sino a 1Mb con la scheda d'espansione AE RamWorks Poi è consuetudine che l'Accumulatore abbia bit<Step_counter MOS6502: register_A:8bit program_counter:16bit Z80 register_A: 8bit program_counter:16bit 6502 e Z80 sono cpu ad 8 bit in quanto hanno accumulatore ad 8bit. 65816 register_A:16 bit program_counter: 24bit 65816 è un microprocessore a 16bit in quanto ha accumulatore a 16bit ed infatti era inferiore al 68000 dell'Amiga che non a caso 68000 (ma il bus dati era a 24bit) 8 registri_A: 32bit program_counter:32bit è un microprocessore a 32bit perchè ha accumulatori a 32bit Se non ricordo male, il bus a 32bit sui motorola fu messo dal 68020/68030 che infatti i mac più nuovi potevano emulare il bus a 24bit oppure lavorare a 32bit pieni. Per farla corta ma breve, i bit che stanno nel program_counter non definiscono il tipo di microprocessore (8,16,32,64) ma sono i numeri di bit che stanno nell'accumulatore/accumulatori. -- - --- I molti partiti comunisti italiani che stanno a DX, al centro, a SX finiranno anche i denari di Draghi, il 31/10/2019
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[articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks zfkirone@gmail.com - 2019-10-19 09:44 -0700
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks scap61 <scap6161@yahoo.it> - 2019-10-21 00:20 -0700
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks "the F.O." <f.o@forward-observer.net> - 2019-10-21 08:22 +0000
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks "the F.O." <f.o@forward-observer.net> - 2019-10-21 07:57 +0000
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks Giulia <far5893@iperbole.bologna.it> - 2019-10-21 10:09 +0200
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks "the F.O." <f.o@forward-observer.net> - 2019-10-21 08:27 +0000
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks "dott.Piergiorgio" <chiedetemelo@ask.me> - 2019-11-01 09:22 +0100
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks "dott.Piergiorgio" <chiedetemelo@ask.me> - 2019-11-02 12:53 +0100
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks "the F.O." <f.o@forward-observer.net> - 2019-11-04 12:41 +0000
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks "the F.O." <f.o@forward-observer.net> - 2019-10-21 10:31 +0000
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks mverpelli@libero.it - 2019-10-22 02:18 -0700
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks "the F.O." <f.o@forward-observer.net> - 2019-10-22 09:47 +0000
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks bfz <bfz@lbr.it> - 2019-10-22 12:09 +0200
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks "the F.O." <f.o@forward-observer.net> - 2019-10-22 10:19 +0000
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks bfz <bfz@lbr.it> - 2019-10-22 12:45 +0200
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks mverpelli@libero.it - 2019-10-22 03:57 -0700
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks "the F.O." <f.o@forward-observer.net> - 2019-10-22 13:08 +0000
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks "the F.O." <f.o@forward-observer.net> - 2019-10-22 12:53 +0000
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks giulia <far5893@iperbole.bologna.it> - 2019-10-22 23:08 +0200
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks "the F.O." <f.o@forward-observer.net> - 2019-10-22 21:51 +0000
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks "dott.Piergiorgio" <chiedetemelo@ask.me> - 2019-11-01 09:10 +0100
Re: [articolo] The US nuclear forces’ Dr. Strangelove-era messaging system finally got rid of its floppy disks Giuseppe³ <miaooaimATtiscaliDOTit@xxx.xxx> - 2019-11-02 20:32 +0100
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