Questions tagged [ram]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
6
votes
1answer
206 views

The IBM RAM with non-standard pin layout

One and half decade ago I had an black IBM Thinkcentre tower. The specs were: Pentium 4 2.66 GHz 256 Mb IBM RAM (which later got upgraded into 512 Mb RAM), 40GB HDD, XP Pro SP3, GeForce 2 MX 400. ...
1
vote
2answers
209 views

Parity error under DOS

I'm facing a Parity Error problem on my new 486er DOS Retro PC. Every now and then a running software crashes with a Parity Error output on screen. This happens for different software so I think the ...
9
votes
1answer
130 views

Patch BBC Master ROM using Sideways RAM?

I have a BBC Master 128 with the standard ROM installed. This includes ADFS v1.50 in slot "D". I want to replace this ADFS in ROM with a patched version, loaded from disk, into Sideways RAM. It is a ...
5
votes
3answers
409 views

Why are RAM chips 1 or 4 bits wide?

I don't know whether it's still the case, but at least in the early days, it was common for RAM chips to be one bit wide, so e.g. an 8-bit computer would install them in groups of eight. I gather at ...
12
votes
2answers
638 views

Why was BASIC on the Commodore 64 one byte shy of 38KiB?

When you power up a Commodore 64 you are greeted with a friendly message telling the user it has 38911 BASIC bytes free. 38,911 is one byte shy of a 38 KiB (1,024 * 38 = 38,912). What was the reason ...
1
vote
1answer
169 views

Does the TurboGrafX16 store switches and/or flags in RAM?

Based the the specs I found for the TG16, it has 8 KB of RAM. I also found notes in the documentation of many opcodes that there is data stored in several "flags and switches" are these stored in RAM ...