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7
votes
1answer
363 views

P′′ Language Interpreter/Compiler Resources

According to Wikipedia, P′′ is a "primitive computer programming language created by Corrado Böhm in 1964 to describe a family of Turing machines." P′′ contains only four instructions has influenced ...
16
votes
4answers
584 views

A good method for formatting a modern device in HFS (Not HFS+)

I started this project ages ago and it's just been sitting on my bench for ever. I have this old MacIIci and I put a LAN card in it, maxed out the memory, has the turbo proc in it. The next step I ...
11
votes
2answers
424 views

How to connect an Apple IIe to an external Sider hard disk drive

I am a sucker for 8 bit junk components, and recently picked up a Sider hard disk for my Apple //e. I was able to talk myself into the purchase by fondly remembering how I lusted after this piece of ...
16
votes
1answer
551 views

Was the Atari 400/800 internal speaker of any use besides key click?

Sounds from the Atari 8-bit computer line came through the RF video cable into your television much like video game systems from the time. The original Atari 400/800 also had a built in speaker, ...
18
votes
4answers
3k views

Quick way to tell how much RAM an Apple IIe has

What is a simple way to tell how much RAM an Apple IIe has? The main RAM is fixed, but Aux RAM can vary. I'd like a solution that can be typed quickly from the keyboard: the context is that I'm ...
5
votes
1answer
248 views

Checking if RAM is functional

I'm trying to revive an old travelMate 518tx and I'm currently in the process of searching for bottlenecks. I want to check if the RAM sticks are still functional or not, but they're both very old, ...
12
votes
6answers
2k views

Converting SCART to VGA/Jack

I have a few home-microcomputers that use SCART to output both audio & video to TV screens such as the Atari STE 1040 and the Sony MSX Hitbit 501. I don't have room to store old cathode-ray ...
11
votes
4answers
660 views

Troubleshooting and reparing an Atari 800XL with a single key not working

I recently purchased an old Atari 800XL off eBay. The machine was untested/as-is and not guaranteed to work, but it was cosmetically in mint condition with original box, manuals, and even the ...
12
votes
1answer
1k views

Can polarity inversion damage a ZX Spectrum?

I have a ZX Spectrum+ and it didn't came with it original power supply. I bought a 9 Volts and 2.25 Amps power supply with switchable connectors. There was a mistake and the polarity was inverted, ...
5
votes
1answer
156 views

ZX Spectrum+ with SCART Interface doesn't display anything

I have an ZX Spectrum+ that came with a SCART interface (unknown brand, all I know is that it's french and that the blue logo seems to spell "IS"). It didn't came with its original power supply so I ...
32
votes
4answers
5k views

Are old versions of Windows at risk of modern malware attacks?

On my answer to a previous question (Can I run Windows 98 and games from the same era on an AMD Duron CPU?) I finished with a warning about using Windows 98 on the Internet, which received the ...
11
votes
2answers
558 views

Why does my Acorn RiscPC display the POST boot error?

After removing the Intel DX 486 card from my RiscPC (running RiscOS 3.6), the computer doesn't start up properly. Instead, it displays the text POST in red. What does this error message mean?
10
votes
1answer
318 views

Was Apple's automatic disk ejection mechanism patented?

I always though it was an awesome idea, but no one ever copied it. Even if more complicated than a standard eject mechanism, I guess it should not have been so outrageously expensive not to be ...
13
votes
1answer
643 views

What is the Kelly chip?

The Amiga 3000+ DevCon 1991 notes says: On the A3000+, these resources include the Amiga "Pandora" chip set (Alice, Lisa, Kelly, and Paula), However, a Kelly chip is not part of the official ...
10
votes
2answers
750 views

What was the A1200 Flash ROM support meant for?

Question inspired by this answer's last paragraph: https://retrocomputing.stackexchange.com/a/1307/2155 The Revision 1 A1200 schematics show that the system originally had support for a two internal ...
12
votes
2answers
482 views

What was the end of line convention for text files on the 8-bit Commodores

A two part question: Did an agreed upon convention for end of line (EOL) within text files exist on the 8-bit Commodores? If there was a convention, what was it?
10
votes
2answers
890 views

Atari Centipede Video and the GBS-8200 didn't seem to work - looking for ideas

So I ordered the GBS-8200 (It's a v4.0) and tried to use it to convert the 15KHz RGBHV monitor output to VGA. I did a direct connect to P11 with Red, Green, Blue and Hsync and Vsync and Video return ...
10
votes
1answer
254 views

What does the H protection bit mean under classic AmigaOS?

The AmigaOS file protection bits allows for Read, Write, eXecute, Delete permissions on files, similarly to Unix (save for the Delete permission). Additional bits are Archive (reset when a file is ...
3
votes
2answers
260 views

External power supply for 16.5V portable computer (Zenith SupersPort 286e)

I have acquired a Zenith SupersPort 286e portable computer without its battery and the external power supply unit seems dead (corrosion and/or leaking capacitors). The problem is that the power suppy ...
47
votes
1answer
21k views

How exactly does Sonic & Knuckles' 'Lock-On Technology' work?

The cartridge of Sonic & Knuckles is a little special: It flips open to allow you to connect another Sega Mega Drive (Genesis in US) cartridge to the top of it like so: I know why the Sega ...
3
votes
1answer
137 views

Zenith SupersPort 286e doesn't boot at all

I have acquired a Zenith SupersPort 286e without its battery but with its (seemingly working) power supply. Sadly, the computer doesn't boot at all, nothing happens when I flick the On/Off switch. ...
6
votes
3answers
1k views

Converting from 15Khz RGB to VGA for an 80's Atari Centipede arcade machine?

I have been hunting around to find a replacement flat panel monitor to replace the honking CRT in a 1980's Atari centipede machine. The existing monitor supports 15Khz RGB which is not really ...
6
votes
1answer
625 views

Where can I find windows 10 driver for old Syquest Drives?

SyQuest made portable hard drive diskettes. I believe they have been out of business going on a couple of decades. At any rate I have some disks and the hardware, but I am unable to find drivers. I ...
9
votes
1answer
286 views

Methodology for imaging Atari disks

I have a pretty decent collection of retro computers, but I have always been a Commodore and Apple guy. I recently picked up an Atari 800XL and a 1050 disk drive, so I am investigating the ...
7
votes
1answer
290 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 ...
12
votes
5answers
2k views

Can I run Windows 98 and games from the same era on an AMD Duron CPU?

I have acquired an old motherboard with a socket 462 and a AMD Duron (I think its a "Spitfire" model 3). The copyright on the CPU is from 1999 and it apparently doesn't require a dedicated CPU fan as ...
21
votes
2answers
1k views

Was the MC680x0's TAS instruction forbidden on Amiga systems only when operating in CHIP memory?

(Note: a previous version of this question asked about the CAS instruction, that was added by Motorola from the MC68020; the original one is the TAS instruction). TAS is the acronym for Test And Set, ...
12
votes
1answer
885 views

Upgrades for the TRS-80 Model 100 portable

The TRS-80 Model 100 portable officially allowed for RAM expansion to 32k and an external acoustic coupler for the model. What other upgrades and peripherals exist for the Model 100? I had one of ...
12
votes
2answers
3k views

Computer graphics before the modern GPU [closed]

Modern computers use a graphics processing unit in order to provide hardware-accelerated graphical operations. Conceptually, I am used to thinking about graphics as a bidimensional array of ...
7
votes
2answers
2k views

Repairing/Lubing/Fixing Amiga 500 floppy drive

I have acquired an Amiga 500 that seems fully functional, but the floppy disk drive seems to have mechanical issues. I could get it to read a few floppy disks until the last one wouldn't pop out when ...
7
votes
1answer
434 views

Is there a KiCad library with parts used in retrocomputers?

I ran into this question a few times and couldn't find any acceptable answer: Once I was trying to reverse engineer a card that had chips like Intel's 8255 PPI, 8226 bus drivers and some other ICs. I ...
7
votes
1answer
225 views

How many cards can safely be put in a IIgs?

The Apple IIgs can have the usual seven cards an Apple II can have plus RAM which has an additional slot. Other devices can end up inside the IIgs such as an adapter for the Game I/O socket or the ...
16
votes
2answers
888 views

Meaning of $ and $$ in Modcomp assembly language

The Modcomp II was a 16-bit minicomputer circa 1970. As well as in FORTRAN IV, the Modcomp family could be programmed in assembly language, with syntax like this excerpt from Kermit for Modcomp: ...
12
votes
3answers
1k views

Is the metal shielding required in all-in-one Amiga models?

All-in-one Amiga computers (500, 600, 1200) have metal shielding surrounding the mainboard. It is in two parts, one below the mainboard and one on top. The mainboard is physically linked to the lower ...
8
votes
1answer
2k views

How can I use a SideWinder 3D Pro with a modern PC running Windows 7?

I've got a sweet joystick that uses gameport, and I'd like to use it in my Kerbal Space Program. My modern PC lacks any ISA or PCI slots, so I can't use the cards I have. I've noticed some gameport ...
7
votes
2answers
80 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
2answers
452 views

Interfacing with vintage Canon monitor

I bought a vintage Canon monitor off a friend which I'd like to interface with and use as a cool retro monitor. The problem is that I can't find anything useful about this monitor after days of ...
7
votes
1answer
352 views

Configuring the slots in MAME for different hardware

How can you configure the MAME emulator for different hardware (hardware cards) in the available slots of the emulated system? For example, how can you put in different cards in the emulated Apple ...
7
votes
1answer
772 views

How do I add multiple internal drives to an Amiga 2000?

The default configuration of an Amiga 2000 has a single internal floppy drive. Can I add a second internal floppy drive? Can I add a third or fourth drive too?
5
votes
2answers
699 views

Is it possible to use the RGB inputs on a Sony PVM with an Atari STE?

As the title states, can the RGB lines on the monitor port of the Atari ST be used with the RGB inputs on a Sony PVM CRT monitor?
11
votes
3answers
2k views

Only “Drive A:” detected with two floppy disk drives

I am trying to repurpose an old Acer Aspire M1641 to copy/format bulks of 3.5'' floppy disks. I think it's one of the last generations of computers to have a 34 pin floppy disk drive header as it also ...
3
votes
2answers
414 views

Clonezilla SCSI HDD cloning problem

I'm trying to clone or take images of old SCSI hard disks. I use Clonezilla and at the last phase, it's written "no input". This is for 68 pin SCSI HDD. In another case, I can't see the hard disk at ...
9
votes
1answer
207 views

What should I do to clean up a Power Mac G3 that's been outside for two years?

I recently was given a Power Macintosh G3 300Mhz minitower (having a bit of trouble confirming that but I'm mostly certain that's what it is(the case is labeled from 1997)) that had been outside for ...
29
votes
2answers
1k views

Rescuing data from old audio cassettes

In my recent expeditions to the darkest corners of my garage, I've found a load (there's a pun in there somewhere) of old audio tapes containing Sinclair Spectrum code. These aren't commercial titles, ...
10
votes
1answer
730 views

How to identify size of a 30 pin SIMM (Atari 1040 STe)

I have recently acquired an Atari 1040 STe with 1MB of RAM. I read that you can extend its RAM with 30 pin SIMM up to 4MB. But it can be done only with 256KB or 1MB SIMM, and that 2MB, 4MB, 8MB and ...
6
votes
1answer
975 views

What was this Apple external CRT monitor that looked like an iMac G3?

In high school I rescued an Apple external monitor from the garbage which looked like an iMac G3, only twice as big. It was blue but I bet it came in different colors as well. It might still be in ...
11
votes
1answer
529 views

Why is the 8254's default rate 18.2 Hz?

The Intel 8253/8254 timer, in its default configuration, triggers IRQ0 18.2 times per second. Why this strange rate, and not something like 60 Hz (to match the most common video refresh rate) or 100 ...
10
votes
1answer
849 views

Timing interrupts on MS-DOS

On the ZX Spectrum, you get an interrupt every frame. As I recall, the operating system uses this to periodically scan the keyboard and probably other things also, but you can have your own routine ...
9
votes
3answers
476 views

How can I copy software which is too large for one Atari ST floppy disk?

I have downloaded the STOS game creator from the STOS download page. I'm trying to copy the software from my computer to a floppy disk formatted on an Atari ST, but I get an error message saying the ...
8
votes
2answers
642 views

Cleaning Atari ST mouse and experiences with the USB/PS2 adapter

I am user a Atari ST computer and my original mouse has a very slow movements and little range for each movement, for this reason it is needed to move multiple times the mouse, I have tried to clean ...

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