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AnswerRe: CP Home Page: HeIsJoshChang Pin
BillWoodruff27-May-18 20:46
professionalBillWoodruff27-May-18 20:46 
GeneralRe: CP Home Page: HeIsJoshChang Pin
Super Lloyd27-May-18 20:50
Super Lloyd27-May-18 20:50 
AnswerRe: CP Home Page: HeIsJoshChang Pin
R. Giskard Reventlov28-May-18 4:42
R. Giskard Reventlov28-May-18 4:42 
AnswerRe: CP Home Page: HeIsJoshChang Pin
Super Lloyd28-May-18 6:23
Super Lloyd28-May-18 6:23 
GeneralRe: CP Home Page: HeIsJoshChang Pin
R. Giskard Reventlov28-May-18 9:58
R. Giskard Reventlov28-May-18 9:58 
GeneralRe: CP Home Page: HeIsJoshChang Pin
Super Lloyd28-May-18 6:47
Super Lloyd28-May-18 6:47 
GeneralRe: CP Home Page: HeIsJoshChang Pin
R. Giskard Reventlov28-May-18 9:59
R. Giskard Reventlov28-May-18 9:59 
GeneralThe Weekend is Over... Pin
CodeWraith27-May-18 13:58
CodeWraith27-May-18 13:58 
,,, but at least I got something done.

@glennPattonWork
I took a step back and put together the schematic for a very primitive computer to control the circuits on the breadboard. It's just the processor, 32k EEPROM, 32k RAM, a register to demultiplex the address lines and a MAX232 (which is driven directly by the processor) as a slow serial port.

I have begun to write the software to put into that ROM. Over the serial port it can communicate with a PC. This can be used both for terminal emulation and to upload test programs.

I have configured the emulator for the old Elf to represent both the prototype and the not yet existing new Elf and started on the software[^]

I have taken the old bit banged serial routines and tuned them from 300 baud to 1200 baud. More is not possible at the clock frequency of the old Elf. At full speed the processor I am going to use has reached 4800 baud in other computers and 9600 baud may very well be possible. At the 'normal' clock frequency my timing values were exactly as calculated, at higher speeds I could not find any working values. Perhaps it's the emulator. Anyway, I think I will use EEPROMs, just in case I must experiment a little with the values. Erasing and reprogramming EPROMs would be a test of my patience.

So, the next steps will be to build the primitive prototyping computer, prepare the ROM and then start prototyping on the breadboard.

And I have a name!

The old computer was called an Elf. Since you guys love puns so much, I'm going to call it Zwölf[^]. If you don't understand, just ask Griff. I think he will get it. Smile | :)
I have lived with several Zen masters - all of them were cats.

His last invention was an evil Lasagna. It didn't kill anyone, and it actually tasted pretty good.


modified 28-May-18 2:38am.

GeneralRe: The Weekend is Over... Pin
glennPattonWork328-May-18 0:18
professionalglennPattonWork328-May-18 0:18 
GeneralRe: The Weekend is Over... Pin
CodeWraith28-May-18 0:51
CodeWraith28-May-18 0:51 
GeneralRe: The Weekend is Over... Pin
glennPattonWork328-May-18 1:27
professionalglennPattonWork328-May-18 1:27 
GeneralRe: The Weekend is Over... Pin
CodeWraith28-May-18 4:10
CodeWraith28-May-18 4:10 
GeneralRe: The Weekend is Over... Pin
glennPattonWork328-May-18 13:05
professionalglennPattonWork328-May-18 13:05 
QuestionWhat are projects? Pin
Afzaal Ahmad Zeeshan27-May-18 7:40
professionalAfzaal Ahmad Zeeshan27-May-18 7:40 
AnswerRe: What are projects? Pin
User 1106097927-May-18 7:46
User 1106097927-May-18 7:46 
AnswerRe: What are projects? Pin
Nelek27-May-18 10:40
protectorNelek27-May-18 10:40 
GeneralRe: What are projects? Pin
Suvendu Shekhar Giri27-May-18 22:15
professionalSuvendu Shekhar Giri27-May-18 22:15 
GeneralMore Microsoft elephants Pin
Richard MacCutchan27-May-18 6:47
mveRichard MacCutchan27-May-18 6:47 
GeneralRe: More Microsoft elephants Pin
User 1106097927-May-18 7:01
User 1106097927-May-18 7:01 
GeneralRe: More Microsoft elephants PinPopular
Richard MacCutchan27-May-18 7:05
mveRichard MacCutchan27-May-18 7:05 
GeneralRe: More Microsoft elephants Pin
User 1106097927-May-18 7:05
User 1106097927-May-18 7:05 
GeneralRe: More Microsoft elephants Pin
CPallini27-May-18 9:33
mveCPallini27-May-18 9:33 
GeneralRe: More Microsoft elephants Pin
Nelek27-May-18 10:43
protectorNelek27-May-18 10:43 
GeneralRe: More Microsoft elephants Pin
CPallini27-May-18 20:48
mveCPallini27-May-18 20:48 
GeneralRe: More Microsoft elephants Pin
Richard MacCutchan27-May-18 21:25
mveRichard MacCutchan27-May-18 21:25 

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