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| Getting it working. http://anycpu.org/forum/viewtopic.php?f=23&t=1079 |
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| Author: | oldben [ Fri Oct 20, 2023 5:07 am ] |
| Post subject: | Re: Getting it working. |
Preview of the ALU card. |
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| Author: | oldben [ Fri Oct 20, 2023 7:20 am ] |
| Post subject: | Re: Getting it working. |
Now 24 bits. .750 us core cycle 1.5 us Memory cycle 1974 74xx & 74Hxx |
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| Author: | oldben [ Thu Oct 26, 2023 8:21 pm ] |
| Post subject: | Re: Getting it working. |
Did some board stuffing, but ran out of bypass caps and sockets. First testing of my 4 bat alu, and it seems to work. |
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| Author: | oldben [ Sat Oct 28, 2023 4:10 am ] |
| Post subject: | Re: Getting it working. |
A 24 bit alu card |
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| Author: | drogon [ Sat Oct 28, 2023 9:32 am ] |
| Post subject: | Re: Getting it working. |
Can help but wonder what the old analog panel meter is doing there... -Gordon |
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| Author: | oldben [ Sat Oct 28, 2023 1:42 pm ] |
| Post subject: | Re: Getting it working. |
I wish to have a good idea of the static power used, by the alu module so I need the meter. With this I can size pcb power and ground tracks. The current design emulates a core memory computer, but the exact timing is a state of flux. The goal is about 1.4 us for a memory cycle, using a 2901 alu around 1976. |
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| Author: | oldben [ Tue Nov 21, 2023 10:49 pm ] |
| Post subject: | Re: Getting it working. |
After I sent the PCB off, I found a schematic error with a last minute change. 1 wire cut and 2 jumpers. |
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| Author: | oldben [ Fri Dec 15, 2023 7:36 am ] |
| Post subject: | Re: Getting it working. |
The mother board. Hope to have it out the door tomorow. |
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| Author: | robfinch [ Sun Dec 17, 2023 8:33 am ] |
| Post subject: | Re: Getting it working. |
Are all those resistors to hold the bus? |
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| Author: | oldben [ Sun Dec 17, 2023 9:54 am ] |
| Post subject: | Re: Getting it working. |
Bus termination of 1K pulled down with 2.2K. TTL drive for the control, LS logic for the reciever. Prototype logic still. PS: The PCB's have shipped, I am expecting Thursday, |
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| Author: | oldben [ Thu Dec 21, 2023 7:17 am ] |
| Post subject: | Re: Getting it working. |
Status from DHL, Arrived at DHL Sort Facility EAST MIDLANDS - UK December, 21 2023 I wonder how many countries, it will visit. Origin Service Area : SHENZHEN - CHINA MAINLAND Destination Service Area : NORTHERN ALBERTA, AB - CANADA |
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| Author: | oldben [ Thu Dec 28, 2023 10:22 pm ] |
| Post subject: | Re: Getting it working. |
The mother board PCB is in today. Hope to have all the PCB's 4 bit alu's, alu and mother board stuffed around the start of the new year. The first round of the Control card is done. Simple 24 bit cpu with 5 registers, A,A',X,S,PC. All one word instrctions. 64K word memory. |
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| Author: | oldben [ Sun Dec 31, 2023 4:57 am ] |
| Post subject: | Re: Getting it working. |
Added a hex display for the current state. Routing is done,just have to re-check the pal logic and pinouts. 1.08 us memory access time about 1967. |
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| Author: | oldben [ Sat Jan 06, 2024 4:01 am ] |
| Post subject: | Re: Getting it working. |
IT's DEAD JIM ! The power on reset chip, dies when I plug In the ALU card into the mother board. Tries a 3 pin POR chip, still stays in reset. Waiting for some 555 timers, for reset using dead bug wireing. The good news is the ALU card seems to work. |
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| Author: | oldben [ Sat Jan 06, 2024 6:58 pm ] |
| Post subject: | Re: Getting it working. |
70's tec lives. I now have 74H04's, TIL311's and NE 555 timers. My dead bug POR works. I still have to revise the single step logic for PAL timing logic on the mother board, to use IDLE-, right now it just holds the clock. As a side note, my Control logic PCB has just left Hong Kong. I just need to dig out more Solder and a New Iron tip from my junk box for that. |
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