Differences

This shows you the differences between two versions of the page.

--- boards:sbc:sbc_v2:start [2018/07/13 05:17]
b1ackmai1er [Features]
+++ boards:sbc:sbc_v2:start [2018/07/16 12:48]
b1ackmai1er [Board]
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 {{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/boards/sbc/sbc_v2/photos/img_1112a.jpg?nolink&600x450|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_boards_sbc_sbc_v2_photos_img_1112a.jpg}}
+[[:boards:sbc:sbc_v2:gallery|Gallery]]
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 [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=0e9afb&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/boards/sbc/sbc_v2/sbc-v2-003-brd.png|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/boards/sbc/sbc_v2/sbc-v2-003-brd.png?direct&652x408}}]]
+===== Errata =====
+There is an error in the board layouts of sbc-v2-003 compared to the original schematic that results in the external reset not working in Kontron mode.
+To configure the board to work in Kontron mode with the external reset coming from the backplane the following workaround can be made.
+  - Pin 3 on K13 needs to be jumpered to Pin 2 of P6 (Reset switch jumper) - this connects the backplane reset input pin (c31) to the reset circuit input.
+  - Pin 1-2 needs to be jumpered on K13 - this connects the /reset circuit output to the backplane reset out pin(c26).
 ===== Jumper Settings =====
@@ Line 108: / Line 120: @@
 Baud rate can be changed using the CP/M MODE program i.e. MODE COM0:57600,8,N,1 /P
-If garbled characters are seen on the display for serial file transfers fail, a lower baud rate should be tried.
+If garbled characters are seen on the display or serial file transfers fail, a lower baud rate should be tried.
@@ Line 172: / Line 184: @@
-===== Serial Cable Instructions =====
-The SBC V2 doesn't have any video capabilities in its solitary form. Therefore, in order to test it, you will need to connect it to a serial terminal (which will provide the keyboard input and monitor output). The easiest way to do this is to construct a cable which will provide a serial port (with a D-sub connector or DE-9 plug) which will plug into a “host” computer running a serial terminal emulation program. This program will allow you to interface with the SBC V2 board using the host computer’s keyboard and monitor.
-First, you must build a cable with an IDC-10 plug on one end (plastic rectangular connector with 2 rows of 5 pins) and a female DE-9 plug (ie. a serial port plug) on the other end.
-The female DE-9 plug is what you will plug into the serial port of your host computer. Serial ports (on the back of the computer) are male ports (ie. they have pins), so the plug at the end of this cable must be a female plug (they have holes). It's not recommended to use accessory serial cables to make this connection (such as null modem cables, etc.). This is because many such cables are wired for specific applications, and may not work with your SBC V2 board. For instance, a serial data transfer cable is wired very differently from a “straight-through” serial cable (pin 1 to 1, 2 to 2, etc.) which is different from a null modem cable. Because of this cable inconsistency, it's preferred to build the complete custom cable from the beginning knowing exactly what pin is connected where and why, and not to use any serial extension cables. The exception to this is using a serial cable that you know is wired as a “straight through” cable (with each pin on one plug connected to each pin on the other plug: 1 to 1, 2 to 2, etc).
-The following cable layout shows what is being connected where in this cable:
-^IDC-10 side^DE-9 side|
-|2|4|
-|3|3|
-|5|2|
-|7|6|
-|9|5|
-Pin 1 on the IDC plug is marked with an embossed triangle on the plug, and this pin corresponds to pin 1 on the pcb which is marked with a square solder hole (at the lower-right most position of the plug on the SBC V2 pcb). The pins on the DE-9 plug are usually marked right on the plug itself in tiny numbers. Strip some wires and solder away. Instead of stripping wires and soldering manually, you can also use ribbon cable and special "direct connect" plugs that connect directly to the ribbon cable without soldering (they have rows of metal "pins" that press down and penetrate the ribbon cable to make the connections). Because of the non-standard pin connections that are needed in this cable (per the above table), however, you will likely need to do some soldering or “custom connecting”.
-Always double and triple check where you’re soldering something before you solder it. When you’ve built your cable, use your multimeter to check connectivity between each pin on the IDC-10 side and the DE-9 side according to the arrangement above to make sure you got it right.
-In order to test connections in a plug you cannot stick the multimeter lead into the hole (because it will not fit). Instead, take a spare piece of wire, stick it into the hole for the pin you want to test, and then touch the multimeter lead to that wire.
-===== Parts List =====
-Full list of parts:{{:boards:sbc:sbc_v2:sbc-v2-parts-list.pdf|:boards:sbc:sbc_v2:sbc-v2-parts-list.pdf}}
-See [[:boards:sbc:sbc_v2:minimum-build|here]] for minimum build and parts substitution guidelines.
-===== Software =====
-There is extensive firmware support for the SBC V2 and associated ECB peripheral cards. Currently there are two firmware builds still being actively developed - UNA and ROMWBW.
-See [[:software:firmwareos:start#active_projects|here]] for current software builds and information on historical projects.
-A debug boot ROM can be installed for testing - try James Moxham's ROMIMAGE.BIN from [[:software:firmwareos:jm:start|here]].
-{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/boards/sbc/sbc_v2/romimage.png?direct&467x384}}
-==== REAL TIME CLOCK (RTC) ====
-The DS1302 real time clock can be set under CP/M using the **rtc** utility program.
-<code>
-Loading CPM...
-CP/M-80 Version 2.2C for the N8VEM, October 2008
-Run XM from A drive, this downloads file to B drive
-A>rtc
-Start RTC Program
-RTC: Version 1.0
-RTC: Commands: E)xit T)ime st(A)rt S)et R)aw L)oop C)harge N)ocharge D)elay I)nit G)et P)ut H)elp
-RTC: trickle charger disabled.
-RTC>
-</code>
-Set the time and date with the** //Init// **command first and then use the //**Set**//  command to program it.
-RTC.COM can also be used to set up trickle charging for the backup battery or super capacitor if connected. More Information on charging Super Capacitors can be found here: [[https://www.maximintegrated.com/en/design/tools/calculators/product-design/supercap.cfm|https://www.maximintegrated.com/en/design/tools/calculators/product-design/supercap.cfm]]
-The utility can also set and read the RTC memory.
-RTC.COM is part of Wayne Warthen's [[https://github.com/wwarthen/RomWBW|ROMWBW]] package.
-===== Status LED =====
-A single color or bicolor LED can be installed for the status LED. The LED monitors the status of the HALT line from the Z80 CPU. Consider the color selection and orientation when choosing. A red/green LED is ideal and logically should show green when cpu is running and red when halted. Or in the case of a single colour LED, on when cpu is running and off when halted. It is wise to not fully solder in the LED until the orientation has been checked to confirm the right sequence. Or, you could install a pin header and run flying leads to an LED mounted in a case,
-The HALT status can be initiated by booting CP/M and running the DDTZ debugger, loading and executing a HALT instruction.
-<code>
-B>ddtz
-DDTZ v2.7M by CB Falconer. CPU=Z80
--a100
-   hlt
--g100
-</code>
-===== Changes from V1 =====
-Information regarding V1 can be found [[:boards:sbc:sbc_v2:sbc_v1|here.]]
-\\