TRS-80 PC-2 Christmas Surprise

Just wanted to say “Thank you” to Eric from for supporting my efforts to create a new USB interface by sending me a TRS-80 PC-2. As a gift!Christmas Gift: TRS-80 PC-2

Not only that, he also sent me a CE-158 serial interface manual (here shown below my interface). Really thanks a lot! ūüôā¬†And Merry Christmas!

Christmas Gift: CE-158 Manual

Sharp PC-1500 Cartridge for debugging

For debugging purposes (and also for¬†playing around with memory chips on a bread board) I’ve created little breakout boards for the cartridge slot on the bottom of Sharp PC-1500s/1600s.

Sharp Debug Cartridge PCBSharp Debug Cartridge insertedI’ve added a layer of foam (not visible on the photo) on the bottom¬†side of the cartridge to prevent the pin ends from scratching on the case.

Typing on the PC while having cables connected to the cartridge is a bit annoying as I tend to pull off the cables when turning the PC around. I’m currently figuring out a better solution by using ribbon cables instead of the pins. I will update the post as soon I’ve managed to make photos of the modified version.


Sharp PC-1500 Interface Card / Breakout Board

Just a little update for all readers interested in Sharp 1500/1600 PCs: for hacking around with the Sharp Pocket Computers I’m using a self-made breakout board that allows easy access to all 60 pins of the interface connector.

Sharp PC-1500 Breakout Board (1)The 60-pin connector is a simple 1.27*2.54 60-pin male header (I’ve bought mine here).

Two LEDs indicate battery or power connection, and on/off state. (In most cases power lights up as soon as the board is attached to a Sharp PC.)

Sharp PC-1500 Breakout Board (2) Sharp PC-1500 Breakout Board PCBs

Suitable paper rolls for the Sharp CE-150 printer

It’s not that easy as it may sound to find paper rolls for a 30 years old printer, the Sharp CE-150. The printer is used in combination with a Sharp PC-1500/1500A pocket computer.

I’ve looked at my small amount of paper rolls, the leftovers¬†I’ve found in a box on the attic. Interestingly they were differing in size (can’t remember¬†why):

Sharp CE-150 Paper Rolls

(Left to Right) Core Diameter Tube Diameter Outer Diameter Width
Roll 1 7.7 mm 14.7 mm 28.5 mm 57.4 mm
Roll 2 8.3 mm 13.0 mm 29.3 mm 57.6 mm
Roll 3 11.1 mm 17.0 mm 33.0 mm 58.7 mm
Roll 4 9.7 mm - 19.7 mm 58.3

Their width¬†and outer diameters did not differ significantly, but the core diameters did. Paper rolls with core diameters of 7-9 mm are hard to get, the rolls sold today mostly have a diameter of 12 mm. I’ve successfully tested thermal (yes: thermal) paper rolls with this diameter in the CE-150, and these are really cheap to get (e.g. on eBay Germany). The ink doesn’t run, but there might be¬†paper rolls¬†with different coatings. I did not check that.

Maybe as a warning: Thermal papers mostly contain Bisphenol A (BPA), a substance that exhibits hormone-like properties!

The approximate dimensions you should look for are:
Width: 57 mm; Inner / outer diameter: 12 / 30 mm; Length: 10 m

Sharp CE-150 Still available paper roll (dimension)