RetroBrew Computers Forum: General Discussion

Home » RBC Forums » General Discussion » Z80 Multi Board Computer (Z80 modular backplane computer)

Show: Today's Messages :: Show Polls :: Message Navigator

Z80 Multi Board Computer [message #8396]

Tue, 23 March 2021 04:28

lynchaj
Messages: 1080
Registered: June 2016

Senior Member

I am revisiting the original Z80 SBC which has evolved into the SBC V2-005 over several years. The goal is to make it modular using lower cost PCBs and an inexpensive backplane. Also to ease the constraints of the original SBC (from 2006) design decisions for a more flexible computer system. The new design uses inexpensive 100x100mm prototype PCBs for the backplane and modules. They are connected with 2x25 2.54mm pin headers/socket strips and all off-the-shelf parts primarily from Jameco and some from eBay (2x25 connectors).

The goal is to ease restrictions on the design to allow for some new configurations. For example, accessing memory over the bus and configurable memory holes for external memory. Making all IO devices optional and limiting IO port addresses to only the minimum necessary. Allowing multiple ROM and RAM modules with boot enable jumpers to specify boot devices. Adding simple debug features like user LEDs and switch. Fully buffered Z80 processor with configurable wait state capability and no internal IO or memory devices. Maintain backwards compatibility to the extent possible (two exceptions so far) to reuse existing SBC software.

So far I've built the processor board and partially assembled the backplane. Still awaiting the 2x25 socket strips from eBay to finish the backplane. Next is a clock board with CPU clock and RTC. After that will be the ROM board which hopefully should be enough for some initial testing with simple programs like jploop etc.

There are no assurances this project is going to work although I have gotten some help reviewing the circuitry designs to catch bugs early. This is my first actual build in a long time so I am sort of rusty but it has been a lot of fun. I have a few extra prototype PCBs so if you are a builder and would like to build along with me let me know. This is not a project where you can expect you can assemble the PCB and it will work immediately. More likely, it won't work and require debugging and modifications as these are initial prototype versions.

So if that sort of thing interests you let me know

Andrew Lynch

PS There have been many PCB updates and respins. Here is a list of the current PCBs:

Z80 backplane V1
Z80 processor V3
Z80 clock V2
Z80 ROM V1
Z80 RAM V3
Z80 serial V2 (DIP-40)
Z80 serial V3 (PLCC-44)
Z80 DUART (PLCC-44)
Z80 PPIDE V1
Z80 FDC V1
Z80 DMA V1

Upcoming boards to be released:

Z80 prototype V2
Z80 VDC V1
Z80 KBDMSE V1
Z80 extended backplane (in work)

PS, I'd put links in the above list but every time I do they get trashed by the editor. Not sure what's wrong but I'll attach a list with links

Attachment: Z80 MBC boards.txt
(Size: 1.49KB, Downloaded 397 times)

[Updated on: Wed, 20 October 2021 07:54]

Report message to a moderator

[Message index]

		Z80 Multi Board Computer By: lynchaj on Tue, 23 March 2021 04:28
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 23 March 2021 06:33
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 23 March 2021 06:36
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 23 March 2021 06:39
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 23 March 2021 07:53
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 23 March 2021 07:54
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 23 March 2021 07:56
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 23 March 2021 07:57
		Re: Z80 Multi Board Computer By: mscane on Tue, 23 March 2021 18:14
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 24 March 2021 03:46
		Re: Z80 Multi Board Computer By: robg on Thu, 25 March 2021 06:59
		Re: Z80 Multi Board Computer By: lynchaj on Thu, 25 March 2021 07:21
		Re: Z80 Multi Board Computer By: lynchaj on Thu, 25 March 2021 12:22
		Re: Z80 Multi Board Computer By: danwerner on Fri, 26 March 2021 09:33
		Re: Z80 Multi Board Computer By: lynchaj on Fri, 26 March 2021 10:23
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 12 April 2021 04:10
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 18 April 2021 06:06
		Re: Z80 Multi Board Computer By: dr_acula on Wed, 28 April 2021 05:40
		Re: Z80 Multi Board Computer By: lynchaj on Thu, 29 April 2021 05:29
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 03 May 2021 04:13
		Re: Z80 Multi Board Computer By: wsm on Mon, 03 May 2021 13:03
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 03 May 2021 14:28
		Re: Z80 Multi Board Computer By: wsm on Mon, 03 May 2021 17:18
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 05 May 2021 03:46
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 24 May 2021 03:31
		Re: Z80 Multi Board Computer By: lynchaj on Fri, 28 May 2021 04:37
		Re: Z80 Multi Board Computer By: lynchaj on Fri, 28 May 2021 05:03
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 31 May 2021 08:18
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 07 June 2021 03:44
		Re: Z80 Multi Board Computer By: mscane on Mon, 07 June 2021 16:37
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 08 June 2021 03:13
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 08 June 2021 06:15
		Re: Z80 Multi Board Computer By: norwestrzh on Tue, 08 June 2021 09:35
		Re: Z80 Multi Board Computer By: edzard on Tue, 08 June 2021 12:15
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 08 June 2021 17:51
		Re: Z80 Multi Board Computer By: mscane on Thu, 10 June 2021 22:52
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 13 June 2021 17:37
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 16 June 2021 03:44
		Re: Z80 Multi Board Computer By: lynchaj on Sat, 03 July 2021 10:07
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 04 July 2021 14:18
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 05 July 2021 05:26
		Re: Z80 Multi Board Computer By: b1ackmai1er on Mon, 05 July 2021 07:05
		Re: Z80 Multi Board Computer By: etchedpixels on Mon, 05 July 2021 08:30
		Re: Z80 Multi Board Computer By: etchedpixels on Mon, 05 July 2021 08:42
		Re: Z80 Multi Board Computer By: Wayne W on Mon, 05 July 2021 20:02
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 06 July 2021 03:23
		Re: Z80 Multi Board Computer By: etchedpixels on Tue, 06 July 2021 04:12
		Re: Z80 Multi Board Computer By: Wayne W on Tue, 06 July 2021 12:30
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 06 July 2021 15:14
		Re: Z80 Multi Board Computer By: Sergey on Wed, 07 July 2021 20:42
		Re: Z80 Multi Board Computer By: lynchaj on Thu, 08 July 2021 03:12
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 26 July 2021 05:15
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 27 July 2021 04:59
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 27 July 2021 04:59
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 28 July 2021 04:59
		Re: Z80 Multi Board Computer By: lynchaj on Thu, 29 July 2021 12:17
		Re: Z80 Multi Board Computer By: b1ackmai1er on Sun, 01 August 2021 04:41
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 01 August 2021 11:43
		Re: Z80 Multi Board Computer By: norwestrzh on Mon, 02 August 2021 09:33
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 02 August 2021 10:49
		Re: Z80 Multi Board Computer By: Wayne W on Mon, 02 August 2021 11:30
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 09 August 2021 04:53
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 09 August 2021 04:55
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 11 August 2021 08:30
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 18 August 2021 04:45
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 06 July 2021 03:08
		Re: Z80 Multi Board Computer By: etchedpixels on Tue, 06 July 2021 03:58
		Re: Z80 Multi Board Computer By: Wayne W on Mon, 05 July 2021 19:28
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 06 July 2021 03:11
		Re: Z80 Multi Board Computer By: edzard on Mon, 30 August 2021 03:29
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 30 August 2021 06:09
		Re: Z80 Multi Board Computer By: edzard on Mon, 30 August 2021 06:23
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 30 August 2021 06:31
		Re: Z80 Multi Board Computer By: edzard on Mon, 30 August 2021 07:06
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 30 August 2021 07:42
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 30 August 2021 11:03
		Re: Z80 Multi Board Computer By: edzard on Tue, 31 August 2021 03:38
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 31 August 2021 03:56
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 31 August 2021 05:00
		Re: Z80 Multi Board Computer By: edzard on Tue, 31 August 2021 05:57
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 31 August 2021 07:58
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 31 August 2021 08:59
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 31 August 2021 15:50
		Re: Z80 Multi Board Computer By: lynchaj on Fri, 03 September 2021 07:19
		Re: Z80 Multi Board Computer By: cmacarthur on Thu, 23 September 2021 14:37
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 26 September 2021 13:14
		Re: Z80 Multi Board Computer By: edzard on Fri, 03 September 2021 08:35
		Re: Z80 Multi Board Computer By: lynchaj on Fri, 03 September 2021 13:34
		Re: Z80 Multi Board Computer By: edzard on Sat, 04 September 2021 02:21
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 08 September 2021 05:21
		Re: Z80 Multi Board Computer By: b1ackmai1er on Wed, 08 September 2021 15:19
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 08 September 2021 17:17
		Re: Z80 Multi Board Computer By: b1ackmai1er on Fri, 10 September 2021 02:25
		Re: Z80 Multi Board Computer By: cmacarthur on Tue, 21 September 2021 12:20
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 21 September 2021 13:57
		Re: Z80 Multi Board Computer By: lynchaj on Thu, 23 December 2021 03:19
		Re: Z80 Multi Board Computer By: lynchaj on Thu, 16 September 2021 16:34
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 20 September 2021 09:14
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 21 September 2021 06:53
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 21 September 2021 06:56
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 21 September 2021 06:58
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 26 September 2021 13:41
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 26 September 2021 16:05
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 03 October 2021 09:29
		Re: Z80 Multi Board Computer By: b1ackmai1er on Mon, 04 October 2021 04:15
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 06 October 2021 04:10
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 06 October 2021 04:15
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 19 October 2021 05:01
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 19 October 2021 05:02
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 19 October 2021 05:17
		Re: Z80 Multi Board Computer By: coredump on Wed, 20 October 2021 17:39
		Re: Z80 Multi Board Computer By: lynchaj on Thu, 21 October 2021 04:36
		Re: Z80 Multi Board Computer By: lynchaj on Thu, 21 October 2021 04:39
		Re: Z80 Multi Board Computer By: lynchaj on Sat, 23 October 2021 06:27
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 24 October 2021 09:01
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 27 October 2021 10:42
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 03 November 2021 04:27
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 14 November 2021 18:12
		Re: Z80 Multi Board Computer By: lynchaj on Thu, 18 November 2021 06:24
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 29 November 2021 12:22
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 29 November 2021 12:24
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 29 November 2021 12:25
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 29 November 2021 12:27
		Re: Z80 Multi Board Computer By: lynchaj on Thu, 02 December 2021 06:22
		Re: Z80 Multi Board Computer By: lynchaj on Fri, 03 December 2021 03:29
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 07 December 2021 04:10
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 08 December 2021 04:38
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 08 December 2021 04:43
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 08 December 2021 04:47
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 13 December 2021 11:00
		Re: Z80 Multi Board Computer By: plasmo on Mon, 13 December 2021 12:16
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 13 December 2021 16:32
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 14 December 2021 08:56
		Re: Z80 Multi Board Computer By: plasmo on Tue, 14 December 2021 09:36
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 14 December 2021 10:35
		Re: Z80 Multi Board Computer By: lynchaj on Thu, 16 December 2021 05:35
		Re: Z80 Multi Board Computer By: plasmo on Thu, 16 December 2021 06:24
		Re: Z80 Multi Board Computer By: lynchaj on Thu, 16 December 2021 09:35
		Re: Z80 Multi Board Computer By: plasmo on Thu, 16 December 2021 18:57
		Re: Z80 Multi Board Computer By: lynchaj on Fri, 17 December 2021 05:06
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 02 May 2022 10:52
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 30 May 2022 05:56
		Re: Z80 Multi Board Computer By: mrgcms on Sat, 18 December 2021 15:35
		Re: Z80 Multi Board Computer By: lynchaj on Sat, 18 December 2021 17:23
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 21 December 2021 10:27
		Re: Z80 Multi Board Computer By: lynchaj on Thu, 23 December 2021 04:15
		Re: Z80 Multi Board Computer By: mrgcms on Sun, 26 December 2021 21:14
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 27 December 2021 03:26
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 27 December 2021 03:37
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 27 December 2021 05:11
		Re: Z80 Multi Board Computer By: mrgcms on Mon, 27 December 2021 12:52
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 27 December 2021 14:48
		Re: Z80 Multi Board Computer By: mrgcms on Mon, 27 December 2021 15:05
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 28 December 2021 03:29
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 29 December 2021 03:20
		Re: Z80 Multi Board Computer By: eugene on Mon, 03 January 2022 00:04
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 03 January 2022 03:48
		Re: Z80 Multi Board Computer By: eugene on Mon, 03 January 2022 04:41
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 12 January 2022 05:21
		Re: Z80 Multi Board Computer By: vackon on Sat, 15 January 2022 13:43
		Re: Z80 Multi Board Computer By: eugene on Sat, 15 January 2022 21:05
		Re: Z80 Multi Board Computer By: vackon on Sun, 16 January 2022 03:12
		Re: Z80 Multi Board Computer By: vackon on Sun, 16 January 2022 04:05
		Re: Z80 Multi Board Computer By: vackon on Sun, 16 January 2022 04:35
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 16 January 2022 05:33
		Re: Z80 Multi Board Computer By: vackon on Sun, 16 January 2022 11:57
		Re: Z80 Multi Board Computer By: vackon on Sun, 16 January 2022 12:10
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 16 January 2022 17:42
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 16 January 2022 17:30
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 16 January 2022 05:29
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 16 January 2022 04:53
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 16 January 2022 04:41
		Re: Z80 Multi Board Computer By: vackon on Mon, 17 January 2022 03:48
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 17 January 2022 05:35
		Re: Z80 Multi Board Computer By: eugene on Mon, 17 January 2022 14:39
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 18 January 2022 03:21
		Re: Z80 Multi Board Computer By: vackon on Tue, 18 January 2022 00:33
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 18 January 2022 03:47
		Re: Z80 Multi Board Computer By: eugene on Thu, 20 January 2022 01:20
		Re: Z80 Multi Board Computer By: vackon on Thu, 20 January 2022 13:30
		Re: Z80 Multi Board Computer By: lynchaj on Thu, 20 January 2022 14:36
		Re: Z80 Multi Board Computer By: vackon on Sun, 23 January 2022 12:08
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 23 January 2022 14:42
		Re: Z80 Multi Board Computer By: mrgcms on Sun, 23 January 2022 15:50
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 23 January 2022 16:45
		Re: Z80 Multi Board Computer By: vackon on Mon, 24 January 2022 07:20
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 24 January 2022 08:54
		Re: Z80 Multi Board Computer By: vackon on Mon, 24 January 2022 11:19
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 24 January 2022 12:48
		Re: Z80 Multi Board Computer By: mrgcms on Mon, 24 January 2022 20:24
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 25 January 2022 02:58
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 25 January 2022 08:56
		Re: Z80 Multi Board Computer By: vackon on Wed, 26 January 2022 01:53
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 26 January 2022 03:44
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 14 February 2022 04:25
		Re: Z80 Multi Board Computer By: vackon on Mon, 14 February 2022 23:52
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 15 February 2022 03:13
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 21 February 2022 11:42
		Re: Z80 Multi Board Computer By: lynchaj on Fri, 25 February 2022 03:20
		Re: Z80 Multi Board Computer By: lynchaj on Fri, 25 February 2022 08:20
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 22 March 2022 04:47
		Re: Z80 Multi Board Computer By: vackon on Sat, 24 December 2022 14:43
		Re: Z80 Multi Board Computer By: lynchaj on Mon, 26 December 2022 12:50
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 15 February 2023 08:50
		Re: Z80 Multi Board Computer By: lynchaj on Thu, 16 February 2023 09:42
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 21 February 2023 04:49
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 01 March 2023 05:08
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 05 March 2023 09:28
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 05 March 2023 09:31
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 05 March 2023 09:33
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 05 March 2023 09:38
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 05 March 2023 09:42
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 05 March 2023 09:46
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 15 March 2023 09:35
		Re: Z80 Multi Board Computer By: lynchaj on Fri, 24 March 2023 15:15
		Re: Z80 Multi Board Computer By: lynchaj on Sun, 26 March 2023 06:23
		Re: Z80 Multi Board Computer By: lynchaj on Fri, 31 March 2023 03:54
		Re: Z80 Multi Board Computer By: edzard on Tue, 16 May 2023 13:05
		Re: Z80 Multi Board Computer By: lynchaj on Tue, 16 May 2023 15:04
		Re: Z80 Multi Board Computer By: edzard on Tue, 16 May 2023 15:19
		Re: Z80 Multi Board Computer By: edzard on Wed, 17 May 2023 00:47
		Re: Z80 Multi Board Computer By: lynchaj on Wed, 17 May 2023 04:28

Previous Topic:	uPD7220 character only mode video board
Next Topic:	CP/Mega upgrade

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sat Jun 14 17:04:16 PDT 2025

Total time taken to generate the page: 0.00966 seconds