Denial

Let's say the cartridge contained random data or 8192 bytes of 0xFF for that matter. The KERNAL will read $A004..$A008 and will not find the signature. For the rest of the boot process, the EPROM will not see /CS pulled low again, correct? The only way the EPROM would see an additional access would ...

Excellent, thank you.

I have a 2764 EPROM PCB that connects expansion port pin 13 (BLK5) to EPROM pin 20 which is chip enable (CE). (You can change that to another BLKn but BLK5 is the default.) How does the Vic-20 know which block is available? I think if the EPROM chip is not enabled by the expansion port then the data...

Ah, good find!

MrSterlingBS wrote: ↑Thu Dec 21, 2023 1:04 am I get this on my VICE @ WINDOWS 10.

Today it works as you posted. Still looks funny but works. Must have been user error. I blame assembly for making my brain tired.

In the Windows version of VICE monitor if I type an equals sign something like a dash but not exactly a dash is echoed back. So for example: bk 100d if A == $41 Looks like: bk 100d if A -- $41 And I get an error because monitor is expecting an operand. I can type a plus just fine and every other key...

Framing error is confirmed.

To fix, I just stored $01 to NINONE ($A9) right after the call to OPEN ($FFC0) and all is well!

Very interesting comments about RS232 in this post: https://sleepingelephant.com/ipw-web/bulletin/bb/viewtopic.php?p=119706#p119706 RINONE ($A9), the flag used to record when a start bit is received is not initialized when an input channel is set up. As a result a framing error occurs when the first...

I have this program that opens the RS-232C device and waits for characters. I have a terminal set for 1200 baud connected to COM4 and I have the same settings in the VICE Userport RS232 section. The program displays the hex value of any character typed on the terminal keyboard. On program restart, t...

Are VICs in short supply? Where did you order from?

joshuadenmark wrote:Schyyy, don't mention HASL

I know, right?

How much were the pcb's? It was $40.95 including shipping for 10 boards, 2 carts per board (they break apart). These are ENIG. HASL is cheaper but a raging debate about HASL had started on the forum when I was ordering so I went with ENIG. Gold plating is even more so I stuck with ENIG, they're for...

where did you get your eprom programmer? It's a TL866CS from Amazon, $49.90 with free shipping: http://a.co/3B31g71 The software is simple to use. I did it in a Windows 10 vm on my Macbook, worked great. I had to manually re-attach the USB device from the VirtualBox menu during the firmware update ...

IT WORKS! The last component I needed, solder of all things, arrived from Amazon today, so... I soldered an IC socket and capacitor to one of the new boards. Then I dl'ed Attack of the Mutant Camels from zimmers, deleted the first two bytes and burned it to an eprom with a cheapo eprom programmer. P...

I am, looking forward to seeing how my Assembly ball bounce demo compares to the Basic test I did.

Me too.