Hello,
Do you want a good news about the PC-1560 project ?
I2C is now working with your favorite pocket computer !
Using the PCF8584P i can now drive the slave I/O chip : PCF8574A.
I will soon test some other I2C components like RTC and memory.
Stay connected !
Most of us really know much about the Sharp PC-1500.
But only a few know the Tandy PC2 system.
It is a complete system with peripherals, software and supplies.
This will be the subject of next articles.
Say connected !
Do you want a good news ?
Your PC-1500 is now able to communicate trough a big LCD of 8×30 in text mode and 192×64 in graphic mode.
The PC-1560 project will do more soon 😉
Hello dear visitors,
My site tries to gather all the information on the fantastic machine that was the handheld Sharp PC-1500 and its various versions.
To advance this work I need your help.
I’m not talking about donations “money” but documentation, books, hardware, software, plug-ins, accessories Sharp, Tandy … etc to complement this collection and also serve me for trade.
For example, Tandy sold a lot of software for the TRS-80 PC2 (Radioshack Tandy) but I found only rarely.
Besides my Tandy PC2 is not the best form and if someone has one to offer I agree 🙂
There is also the original boxes that I miss. Perhaps you have in your attic?
User manuals?
…
As you understand, anything can interest me and use me to advance this site.
I listen to your suggestions 🙂
Thank you to you.
ROM1500.
Working on the PC-1560 project need some tools.
We have to design a new system ROM but at this time don’t have to work with (E)EPROM programmers.
The best way is to look at our hardware stuff !
We most have CE-161, isn’t it ?
Ok, how does this memory module work ?
It need to be plugged on the 40 pins bus.
The PC-1500(A) schematics shows that we have these signals available on the connector:
– /Y0
– /Inhibit (active low to disable the system ROM)
CE-161 schematics shows a 40H138 (Demux) selected by /Y0 (active low) going to /G2A (active low). This signal is nothing but &0000H address.
The system ROM is at &E000H… /Y3 from the 40H139 in the PC-1500.
Simple, no ?
Ok, a DOUBLE hardware inverter is all we need.
The inverter will a the same time :
– connect 40H139 signal /Y0 or /Y3 to the CE-161 on /G2A
– connect /Inhibit to GND or let it to it’s high value.
The inverter must be inside the PC-1500.
Cut the strap from pin 4 of the 40H139.
Connect this pin to one side of the inverter.
Connect pin 7 to inverter’s other side.
Connecter inverter middle pin to the cutter strap.
Now you can choose CE-161 function : RAM or system ROM.
… don’t miss the /INHIBIT pin…
I will soon show your a picture of the system.
Here is the updated schematics.
CE-163 owners will have a dual ROM system… but be careful to switch ROM when powered off.
This is part of PC-1500’s success.
It opens the connectivity to the world.
With the CE-152 K7 player/recorder you can archive your programs.
It’s another under license production by Hiradas Technika.
Do you use the module port to expand memory ? Yes ! 16KB more with CE-161
But they don’t !
Their PTA-4000+16 is nothing but a PC-1500 with a self made 16KB memory board inside.
Crazy, no ?
Stupid ! The module port has being removed and it’s door is glued.
Look at the buzzer… it’s now on the CPU side.
Hiradas Technika had a licence for the CE-150 too.
It’s a perfect clone renamed KA-160.
The light brown wallet is a bad clone.
Most of you don’t know that Sharp PC-1500 was produced in Hungary.
Hiradas Technika, HT, had a licence for a clone : the PTA-4000.
It’s a PC-1500 with e cheap pouch ! Only flat plastic.
The board is really the PC-1500
This printer is really a Sharp clone.
They made the choice of black color… why ?
The pocket is grey and light grey.
