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Introducing a New Z180 CPU Single Board Computer for beginners access to the S100 bus

VCFed about 8 months ago

After quite some discussions within the S100Computers Google Group a number of us have come up with an “easy entry” “build it yourself” board that will allow a novice electronic expert to build a CPU driven S100 board that would work by itself in t …

Bus sniffing a IBM 5150

VCFed about 8 months ago

Following in the footsteps of reenigne here with his wonderful xtserver, previously mentioned here: https://forum.vcfed.o... here: https://www.reenigne.... thought I'd …

8-bit acorn hardware • A negative review of the Music 500! Any others?

Stardot about 8 months ago

http://www.muzines.co.uk/a... 500by Chris JenkinsArticle from One Two Testing, April 1985the Music 500 strikes me as an interesting but ultimately sterile way to produce music. A synth's one thing — at least you can pose on stag …

PCB Reverse Engineering

VCFed about 8 months ago

I find myself faced with the task of reverse engineering an undocumented 15x15" two-layer fully populated PCB. The bus into which it plugs is also undocumented. It's principally populated by MSI TTL, with some resistor packs, and lots of thin traces …

ISA cards with high bus speed tolerances

VCFed about 8 months ago

I noticed someone mentioned in the RealDOOM thread "I have a 20 mhz-ish juko turbo xt" This intrigued me-- what sort of cards are in it? One of the growing pains on XTs was that 1:1 ratio between CPU clock and bus speed. I assume this tended t …
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On the use of early-mid 1970s 4k x 1 DRAMs in the Apple-1

Apple Fritter about 8 months ago

Hi Fans, here is a report about the use of early-mid 1970s 4k x 1 DRAMs in the Apple-1. Most of us are using later 4k x 1 DRAMs produce towards the end of the 1970s or later, such as the ones I furnished with my famous kits (now sold out). Typical exampl …

expected 486 bus activity

VCFed about 8 months ago

Hello, I got a cacheless UM498 with soldered-on 486 CPU. There is a bodge resistor on the back I didn't notice before with one leg unattached, so I'm unlikely to proceed with trying to fix it further. I looked around for what looked like the place where i …
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What Is The Best Commodore 128 Emulator?

How To Retro about 8 months ago

The Commodore 128 is one of Commodore’s lesser-known home computers, released in 1985, it never reached the heights of its predecessor, the Commodore 64, making it somewhat of a curious machine for many. If you’re looking to sample the Comm …
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Commodore 128 Emulators

How To Retro about 8 months ago

The Commodore 128 is one of Commodore’s lesser-known home computers, released in 1985, it never reached the heights of its predecessor, the Commodore 64, making it somewhat of a curious machine for many. If you’re looking to sample the Comm …
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What Is The Best Commodore 128 Emulator?

How To Retro about 8 months ago

The Commodore 128 is one of Commodore’s lesser-known home computers, released in 1985, it never reached the heights of its predecessor, the Commodore 64, making it somewhat of a curious machine for many. If you’re looking to sample the Comm …
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Commodore 128 Emulators

How To Retro about 8 months ago

The Commodore 128 is one of Commodore’s lesser-known home computers, released in 1985, it never reached the heights of its predecessor, the Commodore 64, making it somewhat of a curious machine for many. If you’re looking to sample the Comm …

New Machine = new questions

Apple Fritter about 8 months ago

Hi all:I was fortunate enough to pick up an Apple IIc + with monitor for an amazing deal. Things look good so far but I was running into some ADTPro issues, I think its cabling.But it got me thinking.  What about picking up an external 5.25" off eBay?  …
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What computer bus is this?

VCFed about 8 months ago

... MACH 32 LVGA VGA Video Card Unknown Interface untested #U6E | eBay Find many great new & used options and get the best deals for ATI MACH 32 LVGA VGA Video Card Unknown …

Ultimate PDP-8 ideas thread

VCFed about 8 months ago

I have been discussing many projects with various people lately, and thought it would be a good idea to get these out to everyone to "vote" on them and express interest to help myself and others prioritize. I will also touch on projects already c …

8-bit acorn hardware • Econet timeouts and MTU

Stardot about 8 months ago

The TNMOC econet event inspired me to scratch an itch I've had for a long time but not done much about (econet from scratch), and so far it's going quite well - my prototype can do the full 4 way handshake to my ADF10 equipped BBC Master, so the basic wir …

The micromation M/NET Z64 PROM FF5 below ram needed

VCFed about 8 months ago

G'day again, My wife want to murder me at the moment... after my crash course in Assembly, I have a working monitor in emulator, but I have found the 74s241 PROM that controls the Data Bus to the S100 bus has a bad output. It is corrupting all data on th …

Outrunners no audio (system 32)

Arcade Projects about 8 months ago

Hello, I'm trying to repair an Outrunners pcb that has no sound: The test reports ic21 bad: it's the mb8464, the ram next to z80. I tried to replace it with another one but no change. The other things I checked so far: - the amplifier works fine, - the z80 …
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Creative Soundblaster AWE32, ISA sound card

VCFed about 8 months ago

Creative Soundblaster AWE32 Value card for ISA bus computers.​​CT3... 1996 FM Synth Chip: CT1978 (CQM chip) Wavetable Synth Chip: CT1971 (EMU-8000) and CT1972 (EMU-8011 ROM) Plug & Play: Yes Various internal headers for i …

32-bit acorn hardware • I2C

Stardot about 8 months ago

A casual comment on these forums about something called I2C has sparked my interest. I've not heard of this interface before but I gather it's a two wire serial interface used for connecting things to the bus. The technical manual (chapter 10) shows podul …
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Tom Harte's (et al) JSON CPU Tests

Retro Computing Forum about 9 months ago

This may be of interest to anyone writing an emulator: A number of test suites for various processors, consisting of JSON files per instruction code with various test samples, including, code, start and end states, cycles and memory involved i …

Apple II Prototype?

VCFed about 9 months ago

I've been an Apple collector for awhile, have a slew of Apple II, IIe, and II+ machines, and plenty more that have passed through my hands. I have a few rare pieces, but I've never seen one of these before. From what I can tell, it's an Apple II prototype …

Networking(sort of) to a File Server (sort of)....

VCFed about 9 months ago

I'm taking a break from finishing my suite of RAMdisk applications since I purchased an old IBM PS/2 8560. It now has a dual RS-232 card and I'm hooking each port to a serial port on each of my CP/M machines (one with STB bus and the other is S-100). The P …
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Prototyping computer project updates + asking for advice

VCFed about 9 months ago

Hello Readers! I recommend reading my last post before you read this one. Still Taking the advice I've gotten my previous post, I've made this schematic! Here are the new additions: The Data Bus has Bus Transceivers for I/O (IOD0-7) and Memory (MD0-7 …

2 2 megabyte DEC Q Bus memory cards for sale

VCFed about 9 months ago

I have two spare 2mb memory boards for sale. Third party memory, dual width, parity/block mode DMA memory, both tested and work fine. $150 each or $250 for the pair, if shipped will be done USPS Priority Mail. …
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Scene • Copy-protected images considered to require 1541 hardware mods to write back to disk

Lemon64 about 9 months ago

I have some ideas to stream low-level track data from C-64 to unmodified 1541 via serial bus and write it out directly.In other words, some kind of ghetto nibbler to write back runnable copies to physical disks.Which protections or images have been consid …