Category Archives: Blog

512KB Memory Expansion Module for SHARP PC-1600 by Tom

After my PC-1500 memory module which need some corrections, i’m very proud to present you this incredible 512KB memory module for the PC-1600 built by Tom.
The best thing to do is to let Tom explain it :

At the beginning of 2014 I rediscovered the fascination of the vintage SHARP pocket computers. My very first computer was indeed a PC-1500/CE-150 which I found somewhere deep down in my storage. And it was still working (except the rechargeable battery of course)!

In the 80s, when I was a boy, however the PC-1600/CE-1600P was a dream, but too expensive for me by magnitudes. So I was lucky to buy one from ebay. Since I’m a computer scientist, I was interested to treat that machine like an embedded system using a modern software dev environment and the sdcc/Z80 C-compiler. I succeeded, but soon noticed that the RAM-disk was too small, even on a 32KB+64KB config.

So I searched for custom vintage Tramsoft and Bajic 256KB modules, but couldn’t get one.
That was the point, when I decided to build my own. Luckily I found the homepage of Kai Bader, who kindly offered me one of his breakout boards and I started experimenting with SRAM ICs.
The hard part for me was to decode the PC-1600 vertical bank switch of slot 2, but finally I got my first 256KB RAM module in my hands.

Technical Data (rev 1 – sold out)
* 256KB RAM module with low power SRAM chip
* 32KB can optionally be reserved as a main memory extension, the rest is used as RAM-disk
* No battery buffer

I send one to Kai and he posted it on his website. Allmost immediately I was contacted by Eric – the owner of this great site – who had some clever suggestions for technical improvements and organized a poll at the enthusiasts forum for a revision 2 of the board.
Since my first version had a 512KB SRAM chip on board of which “only” 256KB was used, the main improvement was to provide a 2x256KB mode and a 512KB mode.
It was clear soon that the 512KB harware mode was not supported by the PC-1600 INIT-command, but after some fiddling about I managed to write a patch routine that overcomes this problem.
And that was the birth of the first 512KB RAM module for the SHARP PC-1600.

Technical Data (rev 2 – sold out)
* as rev 1 but 3 modes of operation:
– 256KB mode, without need of any additional init software or peeks/pokes
– 2x256KB mode, with two banks 256KB each – to be switched by an additional hardware switch
– 512KB mode, needs an additional custom patch routine to get that mode running
* Battery buffer not included, but a description for mod available.

For more details see

Technical Data (rev 3 – planned)
* as rev 2 but with (better) battery buffer support incorporated

Thanx again Eric for your support and this very informative and entertaining site.

Thank you Tom for this module !
My friends from Silicium and me are happy with our 512KB PC-1600 🙂

>Click to download the full module description <<


My iPad3 as a CE-154 ?

I had to buy a cover for my iPad but didn’t find any matching my needs.
But on “” there was the perfect item : strong with personalization with my own design.

Here is the result :


It’s perfect to store my manuals and documentations 🙂

TE-1507 : The memory module for developers !

Hello !

The TE-1507 memory module is now in my PC-1500 !
This module offers a very wide memory space for developers.

It was initially planned to have RAM and EEProm but due to a bad EEProm lot… it’s now full RAM.

Standard memory for Basic/ML :
– from &0000 to &3FFF
– 2 x 16KB switchable by PV or PU (jumper to select active signal)
– read only by removing a jumper
– disabled by removing a jumper

EEProm memory (here it’s RAM) for ML only as system/peripheral ROM extension:
– from &8000 to &BFFF
– 2 x 16KB switchable by PU (as in the CE-158 interface)
– set by jumper if it’s in the PV=0 (like CE-150) or PV=1 (like CE-158 or CE-162E) memory space
– read only by removing a jumper
– disabled by removing a jumper

The two memory addresses can be inverted by placing the enable jumpers on the switch positions (90° move)

Here are the pictures :





This module will be a very good investment to expand your PC-1500(A) !
The Team1560 member CGH is working on a ROM builder to add Basic keywords from a wide library. Cool, isn’t it ?

The price for this special module is $75 without shipping costs.

New in the family : PC-1500 RP !

Do you remember the PC-1500 RP2 found in Brazil ?
This new one is the RP and it’s the same for the printer.


This is a full set with all accessories and manuals. The instruction manual is only a bad copy.
The case is very clean ! And all accessories are present : power adapter, pens, paper, cables…
And the papers too : connector cover for the printer, sticker for name.
And the big surprise is the PC-1500RP 8K memory module. Uh, all seems to be named PC-1500RP…
The case is like the one the the PC-1500RP2 but with two rivets on each side. This makes it stronger.
Differences between the RP and RP2 ? None !
Each time the serials are same for the pocket computer and the printer.

Manuals BRLink
PC-1500_RP_INSTR(Not original cover)

In conclusion i think the RP version is the PC-1500 without memory module (or with 8K) and the RP2 is provided with the 16KB module (Remember the PTA-4000 and PTA-4000+16).
Not much differences but we can consider the two versions.
Now we have 11 PC-1500 versions !

Alles für Sharp Computer : january to june 1987


All the book, manuals, magazines provided here are digitized from my personal collection and for information about the PC-1500’s story. They illustrate all the incredible enjoyment around this pocket computer and all the work of thousands of fans. Feel free to find your own original items.
If you are the copyright owner of some digitized documents and want them to be removed from my website please contact me.
And if you own some other items that could be interesting to be published here please contact me.
And if you are fans and have some story to tell us contact me too !

New hardware coming soon : TE-1504B, a backplane for the PC-1500

I wasn’t very present here these weeks… but was designing new hardware for our pocket computer !

TE-1504 : A simple connector converter HD60 –> simple card connector (horizontal)
TE-1504S : Same as previous but with bus drivers (horizontal)

The all time the missing extension :
TE-1504B : A backplane for the PC-1500 with bus drivers and 5 card connectors (vertical)
Each connector respect the same pin role as on the PC-1500.


And there will be two prototype boards :
TE-1504PS : Short version 80×100
TE-1504L : Long version 150×80

Do you have some board ideas for the system ?

Like Status Quo, in the army now, oh-oo-oh…

Do you know that the Sharp PC-1500 was used in the army ?

In this picture we can confirm with a big surprise : it was in the Chinese army !
Who can believe this ? A Japan pocket computer in the Chinese army… but maybe was it the Nanfeng version…
I don know much about it’s use but it’s in a rugged box with a waterproof keyboard mask.
The logo seems to be Chinese Air Force or Airborne.

I would be please if one of my Chinese readers could tell us the item’s story and send us more pictures.
Can someone help me to get one ? I really like it !!!
Do you know similar use in your country ?