Included tags: CPU ×
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IBM PS2/E 9533 Options

VCFed about 5 months ago

Hi there, I just got my first PS2/E and I am thinking about upgrading the machine. What would you suggest to buy ? Here are my thoughts: CPU: I suggest upgrading/installing a 387 in the expansion slot RAM: The machine has 4MB, I will upgrade to 8 or 12M …

8-bit acorn hardware • NMI problem

Stardot about 5 months ago

I have a Model B Issue 7 with disc and Econet - the problem manifests itself occasionally when pressing BREAK - the machine appears to lock up with a blank screen and a flashing cursor in the top left corner. The NMI line to the CPU is held low for a con …

For Sale or Trade

VCFed about 5 months ago

Hi, Boards I am looking for: Cromemco 32K ByteSaver Processor Technology VDM-1 Morrow Thinker Toys Disk Jockey II CompuPro RAM 17 SSM IO4 ExpandoRAM 64K board WameCo EPM-1 EEPROM board Sol-20 System/Buss Probe board MITS Altair 88-MU1 Systhesizer Board …

I need a 32K ByteSaver board ... a VDM-1 board ... and a Thinker Toys Disk Jockey II board ...

VCFed about 5 months ago

Hi, Boards I am looking for: Cromemco 32K ByteSaver Processor Technology VDM-1 Morrow Thinker Toys Disk Jockey II CompuPro RAM 17 SSM IO4 ExpandoRAM 64K board WameCo EPM-1 EEPROM board Sol-20 System/Buss Probe board MITS Altair 88-MU1 Systhesizer Board O …
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Technical questions • Oric-1 Help Needed

Defence Force about 5 months ago

I started this refurb with high hopes of a quick and easy fix, however this is fighting me every step of the way.It was given new caps, the PSU was popped open and new cap fitted (these can be opened as the screws are just hidden with push-in plugs btw), …

QS with MDD DP CPU? is it possible? has anyone done it?

Mac OS9 Lives about 5 months ago

QS 933 is a 7455 PPC. same as the 1.25 DP on MDD.  the bus is different by only 66mhz apart. can the QS bus be clocked up to the MDD?assuming that - teh cpu socket on the daughter board looks the same, is pinout the same? the DP QS uses 7450 cpu' …

Industrial 486/5x86 SBC ver.G6 cpu board

VCFed about 5 months ago

Industrial 486/5x86 SBC ver.G6 cpu board used in good condition$100. Shipped …

586ITOX Industrial board

VCFed about 5 months ago

586ITOX Industrial board with cpu & ram..used $100. Shipped in the US. …

IBM 5150 motherboard repair

VCFed about 5 months ago

Hi all I was getting one of my spare 5150's ready to move onto a new home when it failed It was in the middle of booting, when it died to a black screen. Next power up, it sat on the blinking cursor for 5-10 minutes before I got bored and killed the power. …
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RA70 problems - will not start spinning

VCFed about 5 months ago

Dear all! I attempt to get a RA70 disk running using a KDA50 QBUS controller in a Microvax 3800 (KA655 CPU). Unfortunately, the drive will not spin up. I am wondering if the drive is defect or I still have a configuration error. Does anybody have experie …

Machinist X99 Motherboards?

VCFed about 5 months ago

I was looking at AliExpress and was startled to see motherboard kits being offered for around USD$100, which include CPU and 32GB of DDR4/ECC (strange!) RAM. They seem to be popular with the Russian crowd. Are they worth investigating? …

Software Compatibility Question

VCFed about 6 months ago

Hey everyone, I downloaded Elcotel PNM manager 2.2 (pay phone programming software) for running on my 386DX/33. However, the manual says it needs a 486, MS-DOS 6.2, and Windows (95, 98, or NT). Has anyone had success with running software with a computer …

Good 8-bit kit for beginner?

VCFed about 6 months ago

Hi All, I was wanting to build a kit for either a 6800, 6502, or 8080 CPU and wondering if anyone had any recommendations for a beginner? Beginner in terms of electrical engineering experience, definitely comfortable with programming just not verse in the …

Apple II Plus logic board troubleshooting

VCFed about 6 months ago

I'm troubleshooting a II Plus board from an ill-treated and poorly stored machine. I get question marks on the screen and a few clicks from the speaker instead of a beep. So far the following has been done: 1. Power supply tested good, all voltage rails …
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Pro-Log 4410 (PLS-441) Logic Processor Card

VCFed about 6 months ago

I have a Pro-Log 4410 (PLS-441) Logic Processor Card up for offers This card uses an Intel 4040 4-Bit CPU …

Homebrew S100 - I/O Board

VCFed about 6 months ago

Since my S-100 will only have boards, besides the CPU Board (https://forum.vcfed.org/in... I noticed something that may be an issue. The I/O Board uses a couple 74LS138s for port decoding, and the port decode …

What to do with a 68 K-based CPU board used in the 1990' for piloting a bank of modems.

VCFed about 6 months ago

Hi, when I changed of job in the 1990' I kept a 68K VME board that must have been used to drive a bank of V23 modems. If I remember correctly they were used to communicate with Minitels, the French videotext. At that time I intended to use it to build late …

Rosetta running ppc apps on intel cpu in snow leopard

Mac OS9 Lives about 6 months ago

anyone have any extensive expertise in this department?i have to admit i didnt use rosetta much back when SnowLeopard was currenti just got it installed on a 10.6.8 and loooking to check out the performance …

Altair 8800bt Parts

VCFed about 6 months ago

Hi! I have an Altair 8800bt case, PSU and turnkey card. I am trying to find an 8800b CPU card and the turnkey PCB along with the front dress panel. I was bidding on an 8800b CPU card but for some reason they seem to go for $400+ in the usual crazy biddi …

IBM 5162 Prototype ?

VCFed about 6 months ago

I recently purchased an unusual IBM 5162. It can start up normally. Nameplate indicates that it is a 5162. However, when opening it, I discovered that its motherboard was really peculiar. In contrast to others, my motherboard's chips—including the CPU …

Another Leading Edge DC-2010E Leading Edge Amber Monochrome Monitor issues

VCFed about 6 months ago

No video and no beeps. The voltage rails look good at 5V and 12V. The Varta battery had leaked, but I removed it and cleaned up the leaking. There wasn't too much and the traces that were leaked on look fine. I've tried the mono/cga switch in both posi …

Reviving an Orchid PCturbo 286e Accelerator Card

VCFed about 6 months ago

I have two non-working PCturbo accelerator boards that I’ve been trying to revive. These boards are particularly interesting as they do not use a cable to connect to the CPU socket but are instead able to control the 8088 and use it for I/O. On startup t …

The Forgotten Via C3 Processor

Action Retro about 6 months ago

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Help & Support • Dead Test cart won't advance beyond 1-flash code

Lemon64 about 6 months ago

Hello all,New to the forum as well as to the C64. I've got an NTSC breadbin (250407 style) which seems to have voltages and clocks to spec. Fresh GAL PLA installed. After stepping through some problems preventing dead test from running, I'm now stuck with …

8800b turnkey CPU board

VCFed about 6 months ago

Quick question.. the 8800b CPU board.. did that undergo any revisions as the 8800b progressed to the turnkey? I've been looking through old auction photos and can't make out the revision number on the board.. doesnt look too different in layout from orig …