Yep it will be interesting to see how removing some bypass caps affect the max speed attainable on the retroblade2. I suspect rather than having a uniform value we might be better having alternating bulk (1uF?) and higher frequency (10nF?) caps
Having all the pads there like you have, makes this possible to test
Yep it will be interesting to see how removing some bypass caps affect the max speed attainable on the retroblade2. I suspect rather than having a uniform value we might be better having alternating bulk (1uF?) and higher frequency (10nF?) caps
Having all the pads there like you have, makes this possible to test
At the end of each 4 pins I have an extra bulk capacitor (except on the xtal corner)
Here’s my board with the VGA. If you don’t fit the VGA there’s another 16 IO under the VGA on 0.1” headers. You can actually solder these from the underside under the VGA to get at them but VGA uses the top 5 of these 16 IO.
Note i use a $1.50 usb-ttl instead of a $15? propplug and i get 5V power from the usb as a bonus.
Here is the code. The following changes were required to Chips VGA driver to permit the VGA to be used on a 4pin boundary rather than an 8 pin boundary, and when on an odd 4 pin boundary use Vsync as the pin prior to the base (eg with base = 28, vsync is on 27)
Note my comment on the pinclear section (cogstop). I think this is an error as the cog driving the vga pins is different to the spin code cog, so this doesn't achieve anything.
Thats an interesting pinout don't think i've seen that before. 3v3, Gnd, 5v, tx, rx, dtr. At least it has DTR. Wonder what that naturally lines up with
Thats an interesting pinout don't think i've seen that before. 3v3, Gnd, 5v, tx, rx, dtr. At least it has DTR. Wonder what that naturally lines up with
The fleabay $1.50 shipped USB-TTL 6pin CP2102 (full sized USB-A as the new microUSB uses a different pinout - how stupid). It is shown in the previous pics beside my board, but I swapped the pins to a different long pin female so it plugs into my pcb and sits above the VGA. I use the same USB-TTL on my P1 boards.
The 3V3 is not usable (and not connected on my pcb). I take the 5V/GND from the usb port (ie PC). This is why my boards have the linkable transistor reset circuit. Otherwise an expensive and dedicated PropPlug is required.
I'm doing an inline version of my uPORT that has the USB A plug on one end and the 6 pins on the other although instead of DTR it will be a conditioned reset pulse. It will be very cheap.
I'm doing an inline version of my uPORT that has the USB A plug on one end and the 6 pins on the other although instead of DTR it will be a conditioned reset pulse. It will be very cheap.
Have you considered a microUSB connector? I can link out the transistor reset but the series 100nF and pullup is currently fitted to the pcb. It's possible to put a wire trace to bypass the cap as the cap feeds a small via. Or build with 0R and leave out the 10K.
microUSB ports and keyboard working with Garryj's USB code
However, I didn't realise the USB driver requires 3 pins below the D-/D+ pair. I used P48/49 for J5 uUSB and P50/51 for J6 uUSB. I have P52-57 free, so I just need to work out what to modify in order to use P52/53 and P54/55 for the uUSB connections respectively.
So for testing I just used one port, then the other.
Z80 & CPM2.2 basics working
This is not a fully functional Z80 & CPM2.2 yet but as you can see DIR LS and MBASIC are working. Couldn't recall how to end MSBASIC tho.
Yes Frank, paypal in USD is preferred as i use paypal to buy the parts and they are in USD too. Saves a lot of extra paypal conversion fees which paypal try very hard to extract. I expect to complete my testing within a few days. Then i will announce availability here in this thread.
The first batch will probably be P2 Rev B ES (ADC metal cut was the only change to Rev C).
My 4.0” 480x320 SPI LCD Touch from fleabay arrived today. It’s now basically working on my RetroBlade2 - i just posted this on a new thread as it will also work on the other P2 boards.
Update 2020-11-15: See the first post in this thread for updated order info.
OK I am ready to take orders
Even if you have indicated in a previous post, please add your order in a post below. Payment will be via PayPal in USD (when pcbs are ready). Specs etc in the first post.
The first boards will use Rev B P2's (I will be getting them from Peter) and will not have Flash chips. My Flash chips are limited.
If you want Flash then please specifically ask (because I haven't verified the Flash as yet, and only have one 8MB chip anyway). If required, they will be W25Q64JVSSIQ (8MB) unless I verify that I can fit the W25Q128JVEIQ WSON-8-E on the pads.
Can't seem to find a price anywhere?
Not on you website.
You don't want paypal to exchange currencies your end so it has to be US$ from US what about from UK? (UK£)? and europe (Euros)? Have I got that right?
I think Cluso99 wants the payment in US$ regardless of our (and his) native currencies, at least it is my understanding so if I am in Poland and my currency is PLN I still need to make payment in USD and so he gets USD.
Comments
Having all the pads there like you have, makes this possible to test
Note i use a $1.50 usb-ttl instead of a $15? propplug and i get 5V power from the usb as a bonus.
VGA working on P24-31 and VS on P28. I'll post pics and code here shortly
and in the VGA driver
Note my comment on the pinclear section (cogstop). I think this is an error as the cog driving the vga pins is different to the spin code cog, so this doesn't achieve anything.
Thats an interesting pinout don't think i've seen that before. 3v3, Gnd, 5v, tx, rx, dtr. At least it has DTR. Wonder what that naturally lines up with
The fleabay $1.50 shipped USB-TTL 6pin CP2102 (full sized USB-A as the new microUSB uses a different pinout - how stupid). It is shown in the previous pics beside my board, but I swapped the pins to a different long pin female so it plugs into my pcb and sits above the VGA. I use the same USB-TTL on my P1 boards.
The 3V3 is not usable (and not connected on my pcb). I take the 5V/GND from the usb port (ie PC). This is why my boards have the linkable transistor reset circuit. Otherwise an expensive and dedicated PropPlug is required.
However, I didn't realise the USB driver requires 3 pins below the D-/D+ pair. I used P48/49 for J5 uUSB and P50/51 for J6 uUSB. I have P52-57 free, so I just need to work out what to modify in order to use P52/53 and P54/55 for the uUSB connections respectively.
So for testing I just used one port, then the other.
Worked first time too
This is not a fully functional Z80 & CPM2.2 yet but as you can see DIR LS and MBASIC are working. Couldn't recall how to end MSBASIC tho.
thanks,
frank
The first batch will probably be P2 Rev B ES (ADC metal cut was the only change to Rev C).
Here some to try...
IDENTIFICATION DIVISION. PROGRAM-ID. HELLO-WORLD. * simple hello world program PROCEDURE DIVISION. DISPLAY 'Hello world!'. STOP RUN.Mike
OK I am ready to take orders
Even if you have indicated in a previous post, please add your order in a post below. Payment will be via PayPal in USD (when pcbs are ready). Specs etc in the first post.
The first boards will use Rev B P2's (I will be getting them from Peter) and will not have Flash chips. My Flash chips are limited.
If you want Flash then please specifically ask (because I haven't verified the Flash as yet, and only have one 8MB chip anyway). If required, they will be W25Q64JVSSIQ (8MB) unless I verify that I can fit the W25Q128JVEIQ WSON-8-E on the pads.
Can't seem to find a price anywhere?
Not on you website.
You don't want paypal to exchange currencies your end so it has to be US$ from US what about from UK? (UK£)? and europe (Euros)? Have I got that right?
Dave
I don’t have it on my website yet, and probably won’t for a while.
@Cluso99 let's get this scheduled.
Ken Gracey
Per the first post, the pattern is on the back side.