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Dynabyte DB8/1

by billdeg
Total messages in this thread: 1
This is a restoration program for MARCH for a Dynabyte S-100 system, not to be confused with the Dynabook prototype laptop from Xerox.
The Dynabyte DB8/1 was an early 80's S-100 system that employed the IEEE 696 standard. Click image for larger view.
So far the system has been partially disassembled. The controller cards have been visually inspected (1800002-4A CPU, 64K dynamic RAM Dual Drive Controller). The card connectors have been cleaned, the entire chassis has been vacuumed clear of dust. <">... [ read more ]

Kaypro II pad PLA?

by billdeg
Total messages in this thread: 1
Kaypro II Portable.
The computer powers on, but the drive does not spin, nor does the system respond to a warmboot. The picture you see here is actually a still shot of the screen flashing characters in a rotating pattern of gibberish. I *think* the PLA is bad, 81-149C. Once when pressing down the PLA the system almost completed a boot cycle. I tried a known-working Z80, but no change in outcome.
I have had this system for years, but I never took time to see why it does not boot. Finally this weekend I took it apart to find that the inside condition is pretty bad/dirty. Note the rusty port connectors. ">... [ read more ]

Zenith minisPORT laptop

by billdeg
Total messages in this thread: 1
The Zenith minisPORT laptop computer c. 1990. This is the 2MB ZL-2 model. The ZL-1 came with 1MB. Click thumbnail for larger image.
The Zenith minisPORT is an otherwise standard 80c86 LCD display laptop which is best known because of its 2 inch disk drive.
The Fuji 2 inch LT-1 diskette had a formatted capacity of approximately chkdsk displays 812K. Zenith sold an optional 720K external 3.5 drive. The internal 2 inch drive is not only smaller but it has more capacity (800+ Kb) than the 3.5 drive!
... [ read more ]

New 4Mg Static RAM S-100 board

by monahan_z
Total messages in this thread: 1
In our continuing efforts to build new S-100 boards, Andre and I have just completed a 4Mg Static RAM S-100 board. While this board will work with current 8 bit systems it is really for 16 bit systems (8086, 80286 and 80386 etc.) we currently have in the works. This is just a prototype. Will give more details over the next few weeks. You can follow progress here:- http://s100compu...d/4MG%20RAM%20Board.htm">... [ read more ]

Plus/4 var. '84 Canadian Olympic Team.

by billdeg
Total messages in this thread: 1
Answer to Trivia Question: What was official Computer of the 1984 Canadian Winter Olympic Team?
Answer: The Commodore Plus 4
Commodore sold some Plus/4's with a variation of the logo, and I assume that there was a cool 1984 Canadian Winter Olympics box, too. See Comparison Pic of Plus 4 variant logo design for the "Official Computer of the 1984 Canadian Winter Olympic Team" promotion vs. the standard. more pictures ">... [ read more ]

Lobo Apple II Disk Drive Clone

by billdeg
Total messages in this thread: 1
Very early Lobo Apple II 5 1/4" drive clone, with "Santa Barbara" logo. Click image for more pictures
">... [ read more ]

Replacing toggle switch on Altair 8800a

by billdeg
Total messages in this thread: 1
The good news is that for about an hour or so I had a 100% functional Altair 8800a..
MITS Altair 8800a closeup of broken A0 toggle switch. It's stuck in the 1 / on position
.. but Dan and I broke the A0 toggle switch during testing. It was bent and it was probably vulnerable to break so it did not take much to snap off. The system still works, but I can't deposit any values into memory that end in a "0" using the toggle switches. If I want to examine what's in 0000h I have to flip all of the toggles up (FFFFh), press "examine", and then "examine next" to get to 0000h. The lack of a functioning A0 toggle does not prevent me from using the system from a terminal or teletype as long as I have a bootstrapping monitor installed. A temporary setback only. I decided to disassemble">... [ read more ]

An S-100 Board for an IBM PC keyboard

by monahan_z
Total messages in this thread: 2
Updated: [ S-100 PC Kbd to ASCII Converter Complete ] 02/13/2010
An S-100 Board to convert IBM PC keyboard data to parallel ASCII Many S-100 users have/had some kind of ASCII style parallel port keyboard attached to their system. The interface was just a simple 8 bit parallel input port with a second port single strobe bit. Most of these keyboards came from old mini computer systems or simple CRT terminals. Today they are now quite difficult to find. If there are any parallel port keyboards on eBAY etc. from Atari systems and the like, they are usually not in ASCII format but instead deliver key press data in X,Y coordinates etc. Today almost all PC systems interface the user via an IBM PC (AT) type keyboard. This is in fact may be the single most lasting effect the IBM PC has had on the PC business in the past 30 years. However the IBM keyboard does not return data to the computer via a parallel port. Instead it does so in a more sophistica">... [ read more ]

Apple II A2S1-33122

by billdeg
Total messages in this thread: 3
Updated: [ Source for replacement Apple II ROMs ] 02/04/2010
Recently picked up an Apple II S/N A2S1-rev0.
Apple II Serial Number A2S1-rev0. Click for image larger version.
The original owner installed a fan into the back of the case.
The ROMS that came with the system are: ROM D0 missing ROM D8 missing ROM E0 3410001 ROM E8 3410002 ROM F0 3410003 ROM F8 C2080M E0, E8, and F0 are the original integer BASIC ROMs. As originally received, the system displayed alternating white/black vertical lines with a cursor at the bottom left, when powered on but no Apple">... [ read more ]

Univac 1219 rescue

by billdeg
Total messages in this thread: 1
I participated in the recovery of suite of mid-1960's Univac computers and peripherals. These items were sent to the Mid Atlantic Retro Computing Hobbyist museum housed within the InfoAge Science Center pf Wall, New Jersey. I am V.P of this club. Upon seeing the room full of Univac equipment I was shocked at the sheer size and quantity of the computer systems. It was like being in a Doctor No movie. Tape drives, lights, etc. Everything you'd expect from an early 60's bad-guy headquarters. 2 1219-B's 2 1540 Tape Units 3 1532 I/O Console with Teletype (not 33's, something larger) 1 MK-75 Targeting Computer Another I/O station whose name I forget. spare parts galore, hundreds of flip chips and components cables, connectors, etc. misc other items. After going through the truck rental process I drove to Johns Hopkins APL in Clarksville, MD. I went through the whole">... [ read more ]

PDP 8i sells for $15,000

by billdeg
Total messages in this thread: 1
Pictures taken during a visit to a nearby hobbyist. This system was later sold to Vulcan Electronics.
The venerable PDP 8/i system
PDP 8i - 4 full-height racks. ">... [ read more ]

IBM 5160 - unsung hero

by billdeg
Total messages in this thread: 1
Funny, as much as I use my IBM XT for testing, I never took any pictures of it before.
The empty right-hand drive bay of my IBM 5160 XT computer has been used to test countless floppy disks and hard drives destined for other systems. The reliability of this computer allows me to focus on the drive and any issues that may be related to it, knowing I can count on the computer.
Rear left view of the IBM 5160 XT computer
The IBM 5151 Personal Computer Display
IBM Pics">... [ read more ]

Altair 88-MBL MultBoot Loader

by billdeg
Total messages in this thread: 1
I won an Altair 8800 Prom Board with an 88-MBL prom installed. Tested. The data loaded into memory matches the code listing in the documentation. To be continued.">... [ read more ]

Fido BBS listing node list 6-13-1986

by billdeg
Total messages in this thread: 1
I found a copy of a fidonet node list on a diskette. This nodelist is not currently on any archive. In the BBS spirit, one used to have to upload files before one could get into the deeper levels of a BBS. Back then I remember thinking, what files do I have that anyone would want? Fido BBS listing as of Friday, June 13, 1986 -- Day number 164 : 201113 FIDONET node list 6/13/1986 ">... [ read more ]

IBM 5144 Display

by billdeg
Total messages in this thread: 1
The IBM 5144 was the first "modern" design display made by IBM.
The IBM 5140 PC Convertible Laptop had a lot of add-on features. One of these was an rear attachment for an external display. Pictured is the 5144 monochrome display.
The IBM 5144 the monochrome display made for the Convertible. There was also a color version. The 5144 pre-dated the PS/2 line VGA monitor style, and had the same angles as the 8514 and other first generation PS/2 VGA monitors.
The IBM 5140 came with a customizable menu program and IBM DOS 3.2.
More pictures of IBM PC Convertible Model 5140">... [ read more ]
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