Included tags: Expansion card ×
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General Discussions • Exact Latency Requirements for SRAM, Anyone Know?

MISTerFPGA about 2 months ago

Does anyone know the exact latency requirements for SRAM? I can't find it anywhere, only that it's less latency than the DDR3.The Alliance SRAM used on the 128MiB board has 3 cycle CAS at 143MHz, about 21ns; that doesn't account for row precharge, row-to …

IBM 5150 w/Expansion Unit 1801 post on Boot

VCFed about 4 months ago

1st, let me thank Vintage Computer Federation (and MinusZeroDegrees) for all the great information provided. I have an IBM 5150 with a 5161 that is posting an 1801 on boot 1820 from diags. I tried cleaning up contacts on the extender and expansion cards. …
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SemiDisk ram expansion card

VCFed about 4 months ago

I just bought a SemiDisk ram card with 2MB populated. It came with a test and driver disk with source code !! Anyone ever seen one of these ? It works good. The manual states there was utilities to expand ValDocs. Anyone come across those ? …

Can I get UMB for my XT with this setup?

VCFed about 4 months ago

I recently bought this card (the only memory expansion card that I could find that shipped from within Europe, though not from within the EU), to expand the memory of my 256 kb XT (using the 64-256 k motherboard version). I've started to read up on UMB an …
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Uncle Bernie's "Replica 2e" (WW Prototype of an Apple IIe replica)

Apple Fritter about 4 months ago

Here is a first photo of my brand new "creature", which "came alive" this morning:  PDRM4505B.jpg  It's the wire wrapped prototype of an Apple IIe Replica (not a "clone" !) based on my IOU/MMU PLD substitutes which were al …

Identify expansion card containing mc68020, xylinx xc3090 and ncr53c95

VCFed about 5 months ago

I acquired this expansion card and have no idea what system it belongs to, nor what its purpose is. It has an CPU - mc68020, FPGA - xylinx xc3090 SCSI controller - ncr 53c95. Does anyone know which system this card is used in/comes from ? …
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Common capacitor failure? 16k ram card

Apple Fritter about 5 months ago

16k memory ram card, had a capacitor smoke.   I had installed a new Apple II VGA card I had just assembled and was testing the machine.   I had considered leaving the top of the case open while I tested my newly built card but I didn't since I was runn …

Memory Configuration Help on a 5170

VCFed about 6 months ago

The 5170 has 512K onboard with 128K backfill from an expansion card listed below with the other cards: 1. HD/FD Controller Card 2. IBM Personal System/2 Display Adapter 3. IBM 2.0 Megabyte Expanded Memory Adapter (provides the 128 to make 640) 4. IBM Enha …
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Software & Hardware • 🔨 Amiga Hardware Faults and Solutions List

LemonAmiga about 7 months ago

The Amiga is a Retro computer. Commodore built the Amiga using the cheapest parts, and the weakest solutions. The chips themselves are prone to fail. During my time with the Amiga A500, at least 1 Agnus failed, perhaps x2 CIA chips, and perhaps also Paula …

Recommend expansion card for MOBO se440bx-2 for multiple floppy controller for my P3 800/256/100

VCFed about 7 months ago

Recommend expansion card for MOBO se440bx-2 for multiple floppy controller for my slot 1 P3 800/256/100 The se440bx-2 has a single floppy disk limitation. If expansion card is not viable solution what motherboard would be compatible for a CPU and MOBO t …
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32-bit acorn hardware • Podule detection procedure

Stardot about 7 months ago

I'm trying to understand the Expansion card spec, and this diagram in particular from page 9:What I expected to see was that /PS is asserted during detection, and we then present our ID on to the bus as shown - notably with BD1 low to indicate 'podule pre …

Intel Inboard 386/PC available on eBay

VCFed about 8 months ago

Intel Inboard 386/PC ISA Expansion card with manual and disk. Has a piggy back board with 1 Meg installed and empty sockets for another Meg. Also has an 80387 math chip. …

LC PDS card seems insecure

VCFed about 8 months ago

I recently installed a 10BASE2 LC PDS card. I've never had an expansion card in a Mac before, and I was surprised that there doesn't seem to be anything other than connector friction to hold it in place. Am I correct in thinking that I'd better be carefu …

Apple IIe diagnostic fun...

Apple Fritter about 9 months ago

Hey everyone... I'm still working on that IIe that I bought late last year and have been slowly restoring.  I wrote a message on the forums back in December or so and got pointed to Joe's for a new keyboard decoder chip and that fixed that problem right a …

XT Memory Expansion Card?

VCFed about 9 months ago

Hello community I found this old card in my Compaq Portable while I was disassembling it. It seems to be a RAM expansion card from a 3rd vendor since it appears slightly different to the other parts. I was wondering whether someone has a glue how this ca …

Serial File Transfer from Windows to CPC

CPCwiki about 9 months ago

I have created a Z80 DART based expansion card and this is working fine with Putty on Windows (i.e. what I enter at the putty terminal appears a the CPC).Setup is simple at 9600 BAUD with 8 data bits, 1 stop bit and no parity or flow control.However, when …
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Macintosh Portable PSI RAM plus ??? Card

Tinker Different about 10 months ago

Hey guys, I’ve acquired this RAM plus more expansion card for a portable. It’s showing 5MB in the finder. but there’s 4 switches and two cards sandwiched together. Any idea what this card is and what all it can do? …

ReActiveMicro Phasor Sound crashes / freezes

Apple Fritter about 10 months ago

I have an Apple IIe Enhanced, with a ReActiveMicro Universal PSU installed, an 80col/64k ram expansion card, and I am using a floppyEmu on a 5.25" 655-0101-D controller card (slot 7). There is also a SuperSerial Card installed (slot 2) and it works success …

What should I do with my original 5150?

VCFed about 10 months ago

I bought an IBM PC in early 1982 (S/N 0126633) and have been carting it around with me ever since. It's in the original box, with original keyboard (also still in box), plus a 1200 baud modem and MT80 dot matrix printer. I still have all the original softw …
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LiteSound IIGS stereo audio card back in stock

A2Central.com about 1 year ago

Bob Darlington's stereo sound output expansion card for the Apple IIGS is now available from Joe Strosnider of Joe's Computer Museum. …