Questions tagged [datamaster]
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6 questions
4
votes
2
answers
587
views
How does the capacitive sensing works on the PC / PC/XT keyboard type 2?
I am trying to replicate the IBM System/23 Datamaster keyboard using off-the shelf components. This means that I am using a 8749 instead of the 8048 and some 7400s to replace the LST/MST. For your ...
- 2,296
4
votes
1
answer
219
views
Is there any collection of IBM product announcement and retirement notices? I need them to detail the chronology of the System/23
I am trying to detail the lifetime of the IBM System/23 Datamaster. I have been able to determine that the only launch model at 1981 was the 5322. The 5324 was introduced in 1982. Then the 5322 was ...
- 2,296
6
votes
2
answers
749
views
Is MDA based on the Datamaster video subsystem?
I have read the claim (Byte Magazine, September 1990, "The creation of the IBM PC") that the IBM PC Monochrome Display Adapter (MDA) is based on the previous computer's video subsystem, ...
- 2,296
4
votes
0
answers
142
views
Searching for a third model of IBM System/23 Datamaster
I have been told from a former IBM employee that there's a third model of System/23 other than the 5322 and 5324. It was application-specific and had a printer embedded in it. However he doesn't ...
- 2,296
3
votes
1
answer
265
views
Communication between the CPU and the microcontroller through the (pre-)ISA bus
Studying part of the code of firmware from the Datamaster, I wasn't able to find the I/O ports for the NEC765. Observing the hardware I have observed what it seems to be a 8048[1] in between both ...
- 2,296
4
votes
1
answer
359
views
Intel 8275 CRTC not generating interrupts. Any way out?
According to the 8275 datasheet, the interrupts are enabled always after the Enable Interrupts command is issued. As the retrace counters are always running, even before the component initialization, ...
- 2,296