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32-bit acorn hardware • Archimedes A410 - RPI 1MHZ interface

Stardot about 9 months ago

Hello, i have currently developed a little interface between a RPI4 and the 1MHZ bus of my AKA10 I/O Card used on my A410, I would like to create a ‘bridge’ to allow the keyboard, mouse, disks of my old A400 to be accessible by the RPI and on the othe …

Good inventory program to keep track of my DEC parts and stuff

VCFed about 9 months ago

I'm looking for a good inventory program to help me keep track of all of my PDP-8 stuff. I would like to keep track of physical location, board etch revision, board modification revision, bus type, where used, etc. If you have any good ideas, please let …
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Life-bit, Heartbeat, Watchdog, BEX-Modul

Retro Computing Forum about 9 months ago

My PLC device or better the main PLC I don’t have, has a BEX-Modul. I searched the web with no results. In my manual, I recently found the meaning it’s a “Befehlsausführungsmodul für extern angefordete Befehle”. I also haven’t foun …

Repair of a Clearpoint DCME-Q4E-F

VCFed about 9 months ago

Well, this is interesting. Bought a Clearpoint 4mb PMI memory board on Ebay from a reputable seller. Got the card, plugged it in, didn't work. Changed one jumper that appeared to be the +5 battery/+5 line, and the card came up. Probably was used in a pdp11 …

How does the extended address bus (18/22 bits) work in PDP-11?

VCFed about 10 months ago

I understand that PDP-11 has a 16 bits address bus, while there are multiple versions of QBUS and memory boards (16/18/22bits). I know there are many ways to extend an address bus with a MMU, the most common and simple MMU is probably 74ALS610. Please, can …

8-bit acorn hardware • 1mhz bus connected mem controller/transfer

Stardot about 10 months ago

Hi, does there exist either legacy or newly designed; any hardware which will facilitate very fast memory-chunk transfer for the BBC Model B?Probably 1mhz bus connected enabling copy-from/to, and either avoiding the processor altogether, or at worst a 1 c …

Any ideas please for a source of DC003 and similar DEC chips?

VCFed about 10 months ago

Hi all - in the process of repairing some Q-Bus boards, I am looking for any ideas or inspiration for a source of the DEC bus driver chips, like the DC003 - I only need a few at the moment (6 or so) but would like to not have to remove them from other faul …
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Colors of a data center eg Siemens

Retro Computing Forum about 10 months ago

I have a small Siemens book about planning a data center. Very funny are the colors. To keep a stress less atmosphere, especially due to the artificial lights. First there are the Siemens device colors: Siemens blue (Siemens 4004), green (Siem …

Adding 2nd SSD to Mac Mini G4 in place of optical drive.

Mac OS9 Lives about 10 months ago

Has anyone of you ever tried replacing the optical drive in Mac Mini with SSD adapter like this one? If so, how are the speeds?My understanding is that in Mac Mini both drives are on the same ATA-100 bus and CD/DVD drive is set as cable-select device 1. …

Correct Tarvan Tape Size used with HP Colorado 5GB Drive

VCFed about 10 months ago

Machine is Gateway P2 500 with 20 GB hard drive and 384 MB RAM using Windows XP Pro SP-3. I am using an HP Colorado 5GB Drive with HP Colorado II Backup software Version 9 that is compatible with Windows XP Pro. HP Colorado 5GB drive is IDE model and is cu …

Falcon 11/21 SBC boot problems

VCFed about 10 months ago

Hi All I’ve been noodling around with a Falcon SBC 11/21. I have it installed in a custom Q Bus card cage that has a Compuserve asset tag on it. I have external 12 V and 5V supplies connected to it. The only other card is a M8059 128K ram board. I can p …
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How to identify G4 CPUs?

Tinker Different about 10 months ago

Since I don't know all that much about PPC past 601 a question popped up while rummaging through parts bins: What's the best way to identify what "generation" G4 CPU daughtercard one has? Hopefully this thread can be turned into a valuable resou …

Be careful with bus powered FireWire devices!

Mac OS9 Lives about 10 months ago

Everyone loves bus powered FireWire devices, right? Small, lightweight external HDD/SSD cases, audio interfaces, you name it. Well, aparently there was a problem back in the day with some of the G4s, that, strangely, went under my radar...I was browsi... …
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Dietz minical 621 minicomputer 1971

Retro Computing Forum about 10 months ago

Searching for Siemens DUST 4666 (DUST=Datenübertragung- Steuereinheit, modem control unit, mainframe), there’s also DUET (Datenübertragungseinheit), both another funny acronyms Funny acronyms of software, mainly database systems I found th …

Hardware hacks and extensions • Neo6502

Defence Force about 10 months ago

Can be interesting for some: https://www.olimex.com/Prod... ... e-hardwareIt's basically a 30 euros card with a W6502C processor, a RP2040 SOC with 2MB Flash, the actual 6502 bus is available, and there is HDMI + audio outputs.There's also a Face …
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General Old Hardware • New to retro x86. 486DLC cache/A20 issues on mysterious mobo variant.

Vogons about 10 months ago

This is Camelia. She's a 386 PC I bought on ebay a few weeks back. The entire system seems to have initially been put together by an OEM called NCI. Every part inside had "NCI" warranty stickers and that badge in front seems to have a model name too (NCI …

Video • Geforce 6800 Ultra PCIe and Win98

Vogons about 10 months ago

Hi,I have a crazy problem and would appreciate every tiny bit of help. It is really strange, so please bear with me.I recently got my hands on a cheap Gainward 6800 Ultra PCIe (256 MB DDR3), so I thought this would be an excellent opportunity for my first …

General Old Hardware • Gateway 2000 Socket 5 MB problem

Vogons about 10 months ago

I have a Socket 5 motherboard that looks exactly like this one:https://www.ebay.com/it... is one of that numerous intel OEM motherboards with tens of revisions. One say it's called intel Aladdin that's in turn either OEM version of Intel Adva …

PC Emulation • UniPCemu 8088 cycle accuracy

Vogons about 10 months ago

I've just been wondering about something.Does the 8088 require the BIU transfers to be finished (ticked T4 to become T1) when an instruction finishes with a write?It currently waits for T4 to tick before finishing the instruction on the T1 cycle in that c …

8-bit acorn software: other • External ADFS for 1MHz Bus Second Winchester Controller

Stardot about 10 months ago

Following on from my "Internal ADFS", I've now made a special build of ADFS 1.50 which maps to a different address on the external 1MHz bus, so it can be used with a different controller. This works on my modified Akhter host adapter mapping to &FC44 …
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Discovering Alien: Isolation on Xbox One / Series X

Retro Arcadia about 10 months ago

When does something become a habit? This one started with Elite Dangerous, the fourth game in the space trading series that started in 1984 and I first experienced on the BBC Micro shortly after. It was on the Atari ST that it would become one of my top t …
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PC Emulation • Emulating CGA Snow

Vogons about 10 months ago

Thought I'd start a new thread for this as it's an interesting discussion that could go on for a while.The discussion began here: Re: MartyPCCGA snow is a visual artifact generated by CPU-CGA bus contention in the high-resolution mode of the CGA due to th …

PC Emulation • UniPCemu issues running ReactOS

Vogons about 10 months ago

I'm having issues running the latest ReactOS image inside UniPCemu (i440fx just improved with a lot of extra and improved support for PCI etc.):Kernel log of ReactOS dumped through serial output connected to putty through another UniPCemu (using a TCP con …
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System Specs • Kixs's 286 to the Max Too

Vogons about 10 months ago

After many years of delaying... now is the time for the second round of 286 to the Max ?Link to the first 286 to the Max thread Kixs's 286 to the MaxSystem info/config:Motherboard: Octek Fox II Rev 3.4 with Harris 80286-20; HT12/a chipsetFPU: Cyrix 287XL+ …

Blue G3 Bus Clocking

68Kmla about 11 months ago

I know the information is out there, but I am having trouble finding it... What are the jumper settings for changing the bus speed on Blue & White G3s? …