RAM/PROM board for early S100 computers

[AltairClone]

For anyone who may have missed this in other forums, here’s a link to the FLEX64K RAM/PROM board that is designed to work around all the memory fragmentation that is common in early S-100 systems: https://deramp.com/flex64k.html

Mike

[musovern]

What a great board that you made.
I would of watched the video a few times now. :) It's help me get a Sub system B setup close to running.

I've got Mikes Flex64K board and a VDM-1 2021 board plus the 3S+P serial and have attach a ASCII keyboard plus serial port to the laptop.
I've now got Cuter to boot to the prompt and can dump memory etc, then tested a transfer of a program of to the Altair 8800c it's very slow transfer at 300 BAUD. Think I change this to 9600 over the weekend. Still learning about the CUTER Monitor, I also need to find a way to get ALS8 into EPROM next, I can not seem to find a BIN/HEX file for this.?

Still great fun.

Cheers
Vernon

[Wayne Parham]

That's awesome, guys!

Love that memory board!

Love that system!

[AltairClone]

Here’s a link where you can find cassette ALS8 (loads into RAM). I’ll find the patches I made to it to make an EPROM version and post that as well.

https://deramp.com/downloads/processor_ ... sol20.org/

Mike

[musovern]

That's great.
I might Disable ROM and ENABLE RAM at D000- FFFF and try the tape version. So easy to do this on the Flex64k board. I've now changed over my 3P +S for 9600 now. I see there is added a note that you added a 100ms delay for transfer at the sol20.org.

Just out of interest did you need to patch CUTER13.HEX from your download page it's the one I used in my system.?

Cheers
Vernon

[AltairClone]

Vernon,

No, I did not have to patch CUTER. Here’s a link to the ALS8 I put into EEPROM for the FLEX64K demo:

https://deramp.com/downloads/processor ... patch).HEX

This version takes keyboard input from the serial port on the 3P+S and outputs to the VDM board. Jump to E024 to start and to E060 to re-enter.

Mike

[musovern]

Thank you Mike,
That seems to have gone very easy thanks to your pre made hex file. Is it much work to make a .hex file for ASCII input for the 3P+S board and out to the VDM-1.?

I have only read though the ALS8 Assembler manual once so far, then typed in your example from your video. I got close. I'm guessing I have a space
or something not quite right as I had a error on line 0050, it's fun playing with these old assemblers.

Cheers
Vernon

[AltairClone]

Is it much work to make a .hex file for ASCII input for the 3P+S board and out to the VDM-1.?

Are you wanting to write a program that accepts keystrokes coming in through the 3P+S and displays them on the VDM-1?

Mike

[musovern]

Yes I have the 3P+S board connected to a ASCII keyboard and would like to use that to type on and display on the VDM-1, I have the serial connected to do transfers if needed.

Vernon

[AltairClone]

Try this using ALS-8 to assemble it. This should echo everything typed to the screen. Exit by pressing ESC (1Bh)

Code: Select all

LOOP CALL 0C01FH
 JZ LOOP
 CPI 1BH
 RZ
 MOV B,A
 CALL 0C019H
 JMP LOOP