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Getting it working. http://anycpu.org/forum/viewtopic.php?f=23&t=1079	Page 1 of 5

Author:	oldben [ Thu Sep 14, 2023 5:15 am ]
Post subject:	Getting it working.
I add power to my latest TTL design, and it don't work. What 5 volt power supplies work the best. I hope to beef up the power and ground when I get some thick wire in soon.Ben.

Author:	BigEd [ Thu Sep 14, 2023 7:11 am ]
Post subject:	Re: Getting it working.
A bench PSU with current-limiting is a good one for these purposes, to avoid a melt-down. Some while ago we chose this dual channel one, but it hasn't been used enough to be a strong recommendation: https://cpc.farnell.com/tenma/72-10495/ ... dp/IN06823 Tenma Dual Output Linear DC Bench Power Supply - 30V, 5A That's £150. Much much cheaper would be an ordinary PSU for a PC, maybe £30 to £40. Mean Well is a brand I hear recommended. You might need a dummy load or a sense wire connected up to convince it that you want some power.

Author:	drogon [ Thu Sep 14, 2023 10:05 am ]
Post subject:	Re: Getting it working.
I built my own... some 35 years ago... And a couple of years back I upgraded it from 7805s to modern buck/boost converters off ebay with LCD display, current limiting, display of voltage, amps, power and input voltage. I think they were under £5 each. 3A max, output volts from 3 to 30. I do need to upgrade the old transformer though - it's only rated 1 amp at 9v but for now, it's OK. Attachment: IMG_20230914_110211_DRO.jpg [ 385.23 KiB \| Viewed 29911 times ] Zero points for prettiness ... 100% functional though. -Gordon

Author:

oldben [ Thu Sep 14, 2023 6:32 pm ]

Post subject:

Re: Getting it working.

All I could find was this one, as I hope is linear power supply.
I was kind of hoping for a simple design to build off the web, like this one, from 1980.

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Author:	drogon [ Thu Sep 14, 2023 7:12 pm ]
Post subject:	Re: Getting it working.
oldben wrote: All I could find was this one, as I hope is linear power supply. I was kind of hoping for a simple design to build off the web, like this one, from 1980. https://electronics.stackexchange.com/q ... 110#335110 So get a nice 9v, 30va toroidal transformer, 3 amp bridge rectifier, a big 16v, 1000µF capacitor - that circuit above, put it in a box and off you go... -Gordon

Author:	DockLazy [ Thu Sep 14, 2023 11:27 pm ]
Post subject:	Re: Getting it working.
I use an old ATX power supply for TTL. There are pinout/wiring diagrams on the web. It it fairly simple though, you just need to add a switch that connects the on signal wire to ground.

Author:	oldben [ Sun Sep 17, 2023 5:55 pm ]
Post subject:	Re: Getting it working.
The problem is I have a almost working computer, with some sort of dynamic bug. I have the mico code patched so it just incriments the ACC. It does nothing, just leds displaying something. Front panel switches all off (0's). I turn switch #33 on (1) and it starts counting. Set the switch to 0, it stops counting. The front panel is not used at all. I want to try a linear power, to check if is not switching power supply glitch.

Author:	oldben [ Tue Sep 19, 2023 4:57 am ]
Post subject:	Re: Getting it working.
Well I found 1 bug with a 22v10, fixed that, restored other logic to normal from single step clock. I was now getting garbage with the upper 16 bits. Tried replacing the upper 16 bit slice, powrerd it up. I think I killed my ALU bit slices. Going back to a very primitive, 20 bit cpu design,with software emulation first, and hardware when my budget can afford it, and more testable PCB's.

Author:

oldben [ Wed Sep 20, 2023 12:50 am ]

Post subject:

Re: Getting it working.

I am going to small PCB modules from now on,as they may be more easy to test.
The first pcb is a 4 bit slice, using cheap 2901's. Ths has the MAR. IO reg, input REG
and input multiplexer. Card is 4" x 2". 4 cards make 16 bit ALU.,5 cards 20 bit ALU,
8 and 9 cards for a 32 or 36 bit alu.
PS: cost for 10 PCB's was $50 US with shipping.

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slice78.jpg [ 73.31 KiB | Viewed 29577 times ]

Author:	oldben [ Thu Sep 28, 2023 2:48 am ]
Post subject:	Re: Getting it working.
The PCB's are in. Made a off by 1 wiring error on a little used output pin. Used my last spare pin to fix that. Decided to make the data bus active low,so for that I need new parts. 74ALS640 vs 74ALS643. OCTAL BUFFERS. Started working on the tester for the bit-slive, just some leds and switches. Hope to test a alu module tommorow, too sleepy today.ZZzz

Author:

oldben [ Sun Oct 08, 2023 4:20 am ]

Post subject:

Re: Getting it working.

new alu for a 24 bit cpu

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slice77.png [ 281.77 KiB | Viewed 23014 times ]

Author:	BigEd [ Sun Oct 08, 2023 7:04 am ]
Post subject:	Re: Getting it working.
Is that an LED I see before me?

Author:	oldben [ Sun Oct 08, 2023 10:40 am ]
Post subject:	Re: Getting it working.
Attachment: slice77.pdf [179.49 KiB] Downloaded 908 times YUP! Good old power led. Starting a clean 24 design. Microcode is 256 x 9 x 2 that fits in 22v10's Short address, immedate and register memory formats. PSH and POP. byte (12) and int (24) data types.