SCELBI Oscilloscope PCBs Arrived

August 19th, 2016

Sometime in 2011, Cameron Cooper planted the idea of reproducing a SCELBI computer into my head. Once he had me convinced, I knew that I wanted to reproduce the entire line of SCELBI computers and I/O peripherals. SCELBI produced 16 different PCBs over the short lived life of their computer line, so this was going to be no small task. I knew that it would take a long time, and I was never sure that I would be able to maintain focus long enough to do them all.

At last, after 5 years, the last reproduction SCELBI PCBs have been made! Though I still have to build them up, write some software, and test them, the hard and most expensive part of making the PCBs has been done.

SCELBI Oscope PCBs

SCELBI Oscope PCBs


The digital board is the big one and the analog board is the small one. The digital board takes 16 bits of input from the computer for each character and coverts it into 4 bit digital X and Y vectors and the blanking information that make up a single character. The analog board coverts the XY vectors into analog voltages suitable for oscilloscope input. The analog card also will control horizontal and vertical positioning of each succeeding character and line.

I still have some parts to acquire, but I should have the missing parts and be able to begin assembly in about a week or two. Meanwhile, I can do some work on the software.

Here is the list of all 16 SCELBI PCBs
Main System Cards
1100 CPU – 8H/8B
1101 Data bus buffer – 8H/8B
1102 Input – 8H/8B
1103 Backplane – 8H
1104 Front Panel – 8H/8B
1105 1K SRAM – 8H
1106 Memory Expansion – 8B
1107 4K SRAM – 8B
1108 Backplane – 8B
1109 PROM – 8B

Peripheral Cards
2100 Oscilloscope digital
2101 Oscilloscope analog
2102 Audio Tape output
2103 Audio Tape read
2104 Teletype interface
2105 Keyboard

SCELBI Keyboard Interface Checkout

August 8th, 2016

After bench testing, I had to write an 8008 driver and hook up the keyboard interface to a real SCELBI to complete checkout. The standard I/O ports for the keyboard are port 4 for input and port 16 for output. For testing purposes, here is how the setup was hooked up.

Keyboard Interface Checkout

Keyboard Interface Checkout

Here is the driver.

167 ; HERE IS THE USER DEFINED CHARACTER INPUT TO READ FROM KEYBOARD INTERFACE
168 ;
169 ; returns character in A
170 INPUT:
171 44-256 111 INP KEYIN ; read keyboard
172 44-257 240 NDA ; is a new character present
173 44-260 120 256 044 JFS INPUT
174 44-263 125 OUT KEYOUT ; ack character read
175 44-264 044 177 NDI 177 ; clear MSB
176 44-266 007 RET ; return character in A with MSB clear

In order to test, I simply changed the input driver on my modified creed monitor (MCMON), moved it to SRAM address 010-000 and downloaded using the MCMON monitor that is in EPROM on my SCELBI 8H. Then I jumped to the downloaded monitor to see if it would take input from my PS/2 keyboard adapter instead of the serial port. It all worked exactly as expected. I just need to put it into an enclosure and I can consider the hardware for this board done.

The software will probably take some more work, as I will have to integrate this keyboard driver with the oscilloscope driver for MEA, once I get the oscilloscope cards built. Speaking of the oscilloscope cards, I think I should be ordering the PCBs within a week or two. That interface will take considerably more software in order to get it working.

Laser Printing PCB Etching Experiments/Improvements.

August 7th, 2016

While fabricating another SCELBI-RS232 PCB I did some experiments with transferring the toner to the PCB. After some less than stellar transfer attempts, I got a good transfer and etched this board.

SCELBI-RS232

SCELBI-RS232

You can ignore the mess around the DB-9 connector, that was the result of soldering with too big of soldering iron tip in that tight space. As you can see the circuit is very crisply etched. The circuit has a lot features with 10 mill spacing, for example, the smilely face has 10 mill lines with 10 mill spacing to the flood area.

I accomplished a good transfer by reducing the heat setting on my iron and making the transfer in less than a minute. I used to use maximum heat and really use a lot of time and pressure to iron on the toner. This often resulted in embedding fibers of the paper in the transfer, so I decided to experiment with backing off on heat. I decided it was better to just use enough to melt the toner to make the transfer. I use paper from glossy magazines, my favorite being National Geographic, which seems to use a little heavier paper than some other publications. The low cost of redoing a toner transfer means you should experiment with these techniques until you get a solution that works for you.

Once I got a good transfer for the copper layer, making a silk screen transfer was pretty easy. Apply the silk screen after etching the copper, but before drilling.

SCELBI-RS232 Silk Screen

SCELBI-RS232 Silk Screen

SCELBI Keyboard Interface Basic Checkout

July 31st, 2016
SCELBI Keyboard Interface Checkout

SCELBI Keyboard Interface Checkout

This setup is being used to checkout basic functionality of the SCELBI Keyboard Interface card. The card was designed to interface to a Don Lancaster Keyboard as described in a couple of articles published in Radio-Electronics in 1973. The first article was the February issue and contained instructions on building a basic non-encoded keyboard. The April issue contained a follow on article with a description on how to build a keyboard encoder. These links contain the original articles and are hosted on Michael Holley’s comprehensive SWTPC pages. This keyboard/encoder design does not latch keypresses, but simply outputs what it sees, as the keystrokes occur. The strobe is supposed to come after the keyboard data, and end prior to keyboard data, so interfacing hardware doesn’t have to do anything fancy to latch the data.

The SCELBI keyboard interface accepts 8 bits of input data from the keyboard, with the most significant bit (MSB) being a strobe. The interface to the SCELBI computer contains 8 bits of data, with the MSB being a data available indicator. The data available indicator is cleared by a single input (high to clear) from the computer. The data and strobe coming from the keyboard can be independently inverted or not, by correct selection of jumpers around Z1 and Z4 and inclusion of the Z1 and Z4 7404 inverters or not. Leaving the 7404s out and bypassing them with jumpers will result in inverted data. With my PS/2 keyboard adapter, I needed to use the 7404 to keep the interface from inverting data. At one time, I had a version of PS/2 adapter firmware that would invert data, which would have been handy in this case, but I removed that feature some time ago.

It appears that SCELBI engineers had trouble using the Radio-Electronics keyboard strobe to latch data correctly. The strobe is OR’d with the data bits in order to make up an internal strobe for use within the board. Many keyboard designs internally latched data, and this extra circuitry doesn’t work since the incoming data never goes away, and the strobe stays stuck on. For my testing, I used one of my PS/2 adapters. I considered two solutions to this problem with strobe. My first thought was to modify my PS/2 keyboard adapter firmware to make it emulate a non-latching keyboard. In the end, after playing around with the interface, I decided to simply delete the gates that OR’d keyboard data with strobe. This can be seen in the following photo as the deletion of IC Z7 and the jumper from the pad at pin 2 to the pad at pin 12.

Configured Keyboard Interface

Configured Keyboard Interface

With this simple modification, I have bench tested the keyboard interface to the extent possible. Next, I need to write a small 8008 keyboard driver and connect to my reproduction SCELBI 8H.

Source of Sn72741 op-amps

July 16th, 2016

The SCELBI cassette and oscilloscope interfaces both use a rather unusual variation of the jelly bean 741 op-amp. This is the TI SN72741, which puts this op-amp in a 14 pin DIP package. Though they can be had on e-bay, I recently discovered that expediters.com has them for $5.50 each. They can be found at this link:http://www.expediters.com/index.jsp?path=product&part=845153&ds=dept&process=search&qdx=0&text=Sn72741

SCELBI Power Supply Internals

July 13th, 2016

This SCELBI 8B power supply is built in a shadow box type chassis that is approximately 10″x5″x6″.

SCELBI-8B-power-supply-front

The internals are simply two Power-One linear Supplies, a switch, a fuse, 3 binding post type connectors, an amphenol 78S4 type connector and a fan. Here is an image of the interior. The fan is connected to the top, so isn’t visible in this view. The 5 volt supply is a C5-6 and the -9 is a modified B15-1.5. Be aware that the -9 supply is not powerful enough for a fully loaded 8H chassis.

SCELBI Power Supply Internals

SCELBI Power Supply Internals

Repro SCELBI Keyboard Interface In House

July 4th, 2016
SCELBI Keyboard Interface

SCELBI Keyboard Interface

Looks like I have enough parts on hand to build one of these babies up. It expects a decoded but unlatched keyboard. I don’t have one of these, so I’ll modify the firmware on one of my PS/2 adapters to act like one. With that I should be able to hack together a simple 8008 driver that will eventually work with MEA on the SCELBI.

SCELBI 8B with Power Supply

July 3rd, 2016
SCELBI 8B Complete

SCELBI 8B Complete

Here is a complete, original, SCELBI 8B system that I was recently able to examine and operate. In the past, I already had examined the TTY and Cassette interfaces. This time, I was able to examine the power supply and will put up some posts in the near feature, including interior shots.

SCELBI Oscilloscope Digital Board Rework Instructions.

June 6th, 2016

This document provides rework instructions that will bring the PCB up to the revision seen in the schematics. I now have a pretty good understanding of how this interfaces works and will provide more details in a future post.

Oscilloscope Rework Instructions

Where Did All The Moths Come From?

June 1st, 2016

Over the last few years, we have had a plague of small moths, especially in the spring time. There are so many, that the larva from these moths defoliate certain types of trees in the spring. So far, these trees have managed to survive, but I’m wondering how many more years that they will be able to tolerate this. The moths are attacted to the lights inside the house at night. There are so many moths, that they get into the house almost every time you open a door at night.

While discussing the disapperance of the Bats with a neighbor the other day, I think I came up with the likely reason that the moth population has run amok. Bats eat moths and other similar sized flying insects, such as dragonflys. With the bats out of the picture, the moths have had little to curb their population, except the available food supply.

Note that bats typically do not eat mosquitos, since mosquitos are too small too provide much nourishment. Dragonflys do eat mosquitos, so with the bats gone, there may also be a reduction in the mosquito population as one consumer of the dragonfly population has been taken out of the picture. Come to think of it, the mosquito population does seems to be low for this time of year.

The balance of nature sure is sensitive and it’s surprising to see it out of whack in our own backyard.