Thread View: alt.folklore.computers
3 messages
3 total messages
Started by Quadibloc
Sat, 28 Jul 2018 21:18
The Hidden Front Panel of the IBM 5100
Author: Quadibloc
Date: Sat, 28 Jul 2018 21:18
Date: Sat, 28 Jul 2018 21:18
11 lines
1709 bytes
1709 bytes
Although no blinkenlights are provided, a very small amount of front bezel real estate was needed... The IBM 5100 had a switch, Registers/Normal, that changed its built in CRT from displaying the dialog between the user and the program running to displaying the CPU's internal registers. This might make it the last well-known computer to have some sort of provision for viewing the processor's registers like that... John Savard
Re: The Hidden Front Panel of the IBM 5100
Author: Oregonian Haruspex
Date: Mon, 30 Jul 2018 12:46
Date: Mon, 30 Jul 2018 12:46
1 lines
1459 bytes
1459 bytes
My HP41 can do that too.
Re: The Hidden Front Panel of the IBM 5100
Author: Christian Corti
Date: Wed, 01 Aug 2018 07:40
Date: Wed, 01 Aug 2018 07:40
12 lines
1977 bytes
1977 bytes
Quadibloc <jsa...@ecn.ab.ca> wrote: > The IBM 5100 had a switch, Registers/Normal, that changed its built in CRT from > displaying the dialog between the user and the program running to displaying the > CPU's internal registers. To be more precise, it's only a coincidence that you can see the internal registers. Technically, you see the first 512 bytes of the RWS, but the registers are memory mapped (16 words for each IL, 64 words total) at X'0000, they are implemented separately on the CPU card with two 64x9 bit TTL RAMs. Christian
Thread Navigation
This is a paginated view of messages in the thread with full content displayed inline.
Messages are displayed in chronological order, with the original post highlighted in green.
Use pagination controls to navigate through all messages in large threads.
Back to All Threads