Questions tagged [rom]

For questions about Read Only Memory.

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117
votes
2answers
21k views

How did Commodore's anti-Microsoft Easter Egg work?

A couple years ago the Toronto PET Users Group published an article (The Great Commodore/Microsoft Easter Egg War, on p. 7) about a newly discovered anti-Microsoft Easter Egg that Commodore hid in the ...
15
votes
3answers
2k views

Speed of early ROM versus RAM chips

In the late seventies, up through around 1981, the maximum access speed of off-the-shelf RAM chips was around 2.6 MHz. Did the same speed limit apply to ROM chips of the same era? If not, what would ...
16
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4answers
2k views

Best way to locate data on ROM? (6502 Processor)

Lately I've been interested in how old machines work, in particular an NES. While there are quite a few resources on the basic operations and even some games that have been totally broken down byte by ...
46
votes
4answers
7k views

Why would older video games include fragments of source code?

One thing that was surprisingly common in older video games (around the same era assembly language was king) was the inclusion of uncompiled, plaintext source code in the ROM. You can see many ...
9
votes
2answers
3k views

How to get a dump of a particular ROM?

How do I create a dump of a Game Boy game so that I can have it for backup as a ROM? I know that I can download the ROM (though slightly illegal) if I really wanted to, but I want to know "how" ROM ...
15
votes
1answer
944 views

Why did POKEing ROM addresses mask port writes?

After reading mcleod_ideafix's answer about the Inves Spectrum+'s "randomize of death", specifically his article on the subject, one thing struck me as odd. From César Hernández Bañó's research: ......
10
votes
1answer
1k views

What kind of EPROM was used for the Apple //e character generator, and how do I write a new one?

I have an old Apple //e clone, bought in Brazil (but assembled who-knows-where-on-Earth) that has not been touched for over 15 years. At least, from what I could see, it is a //e -- but not enhanced, ...
16
votes
4answers
2k views

Historical price of ROM

Historical price charts for RAM are quite readily available, e.g. in the mid-seventies a ballpark figure was a penny a byte. What was the price of ROM (assuming you were getting the chips produced in ...
9
votes
1answer
748 views

Restore original ROM on PalmOne m515

I've recently bought an old Palm m515 PDA. It seems that the previous owner has removed some of the built-in applications like Calendar and Contacts from it, because when I want to start them it says ...
11
votes
2answers
6k views

What did the Supercard “patch” program actually do to GBA and NDS ROMs to make them playable?

The Supercard is a flash cart for the Game Boy advance which can play ROMs and other files off of assorted flash memory. I recently found my Supercard SD and Superkey for NDS, which acts as a ...
7
votes
1answer
406 views

ROM programs on the Sony MSX HitBit HB-501

I have acquired a Sony MSX HB-501 F (F stands for France, it only defines the keyboard's layout). It is fully functionnal, I can play games from cartridges on it and it displays MSX-BASIC if no ...
8
votes
2answers
98 views

Is there any persistent storage in a NEC MobilePro PocketPC?

I have recently acquired a NEC MobilePro 790 PocketPc from 2001. The specifications says that the device has 48MB memory, including 32MB of RAM and 16MB of flash storage. It also has a ROM that ...
13
votes
3answers
3k views

Extended ROMs on the Amiga CD32 and CDTV

Continuing my series of questions about Amiga ROMs :-) The Commodore CDTV contained a normal Kickstart 1.3 ROM, plus an "extended ROM". From http://www.l8r.net/technical/cdtv-technical.html: The ...
11
votes
1answer
793 views

Does an Apple //e actually have 64KB of RAM?

Inspired by this question about the C64, I was curious if the Apple //e (and I suppose //c and IIgs, though not sure of ][+) somehow had a similar behavior. In short, we know that the Apple ROMs start ...
6
votes
2answers
911 views

Arcade games in Apple IIc's ROM

Is there a website where I can find the old games that where pre-installed in the Apple IIc ROM? When I could not get an OS disk, I could still have some fun with my Apple IIc by playing those arcade ...
6
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2answers
2k views

Dumping Nintendo 64 cartridges without a backup device

I've seen various posts online about Nintendo cartridge dumping. Two popular posts which come to mind are Thijs Alkemade's Game Boy cartridge dumping on a Raspberry Pi series and NintendoPlayer's ...
12
votes
1answer
447 views

What's the difference between Williams Earthshaker pinball ROMs L-3 and F-1?

I acquired a Williams "Earthshaker!" pinball machine several years ago. It came with the version L-1 ROM installed. I noticed that sometimes balls would get stuck in the shelter kick-back-up mechanism ...
32
votes
7answers
5k views

Is it legal to download ROM images from shared or internet archives?

Is it generally legal to download older ROM images of commercial software and games for non-commercial use in a retro computing system (emulated or otherwise)? (Note that this question implies no ...
17
votes
3answers
978 views

What is the relationship between solid-state ROM and inaccessible content in arcade games?

I was browsing through tcrf.net, which specializes in displaying unused programming and content left in games by developers, and came across this page: https://tcrf.net/Tank Specifically, the ...
9
votes
2answers
524 views

Homemade ROM cartridge for Thomson TO7/70 home computer

I recently acquired a Thomson TO7/70 home computer. It came without any MEMO7 cartridges (ROM cartridges) that are necessary to properly use it. I found images of the ROMS, and a schematic, so in ...

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