Good idea, I'll give that a try! Hopefully my Mouser order will arrive tomorrow as well....
- Gary On Wednesday, August 27, 2014 11:56:16 PM UTC-4, monahanz wrote: > > See if you get the exact symptoms by switching around identical LS541’ s, > LS244, etc. Often that can identify a bad one. Be very careful not to mix > the current working arrangement. I usually number them before any moves. > > > > John > > > > > > *From:* [email protected] <javascript:> [mailto: > [email protected] <javascript:>] *On Behalf Of *[email protected] > <javascript:> > *Sent:* Wednesday, August 27, 2014 8:09 PM > *To:* [email protected] <javascript:> > *Cc:* [email protected] <javascript:> > *Subject:* Re: [N8VEM-S100:5064] 6502 CPU board questions > > > > John - > > Thanks for the hints. > > I'm able to input the IOBYTE correctly and echo to the screen. The > monitor recognizes keyboard input and echoes them, just doesn't process > correctly. I think it's a problem accessing RAM, as the symptoms are > slightly different with various ram boards - probably upper address line as > the I/O ports work fine. > > I have another batch of 74LS541's ordered, if that doesn't help I go thru > the board wiring again! > > - Gary > > > > On Wednesday, August 27, 2014 6:09:47 PM UTC-4, monahanz wrote: > > Gary do you have all the jumpers as listed in the yellow table in the > “normal” positions. . The fact that it can sign means you are almost > there. Sounds like an address line problem or data I/O problem. After the > signon have it input the SMB IOBYTE port and immediately output to console > in a loop. Check ASCII character is always correct. > > Next do same inputting from Propeller input port. Next input, place in > RAM, read back from RAM and display… > > > > John > > > > > > *From:* [email protected] [mailto:[email protected]] *On > Behalf Of *[email protected] > *Sent:* Wednesday, August 27, 2014 12:43 PM > *To:* [email protected] > *Subject:* [N8VEM-S100:5058] 6502 CPU board questions > > > > I'm trying to get the 6502 Master/Slave CPU board working - and seem to > have hit an dead end. > > If anyone could confirm what they are using for monitor code, and jumper > settings I'd be VERY appreciative! > > Background: > > Minimal system with SMB, 4mb SRAM, Propeller I/O and 6502 most recent > Master/Slave PCB. The SMB, SRAM and Propeller boards work fine with Z80 > and 8088 systems. > > All testing and assembly worked as expected following John's notes until > the 28C64 was installed. > > I burned the 28C64 from the 6502mon.bin V1.0 file, with the code starting > at 01000H in the 0000H --> 1FFFH space. 01000H thru 010FFH contains 00h as > expected, and I can see the jump vector addresses in the top of memory. > 0000H thru 0FFFH contain FFH as a fill character. > > I had to change the P31 jumper to connect 5-6 to get the monitor to sign > on. Set up as a bus master (only cpu in system). > > Now I get the monitor to sign on and print the menu twice. It then > accepts input characters but doesn't respond properly to any. Single > letter commands like "A" just reprint the menu. Longer commands like > D0000,0100 accept the full input and reprint the menu. > > CPU is a W65C02S6TPG-14 purchased thru a reliable source (Mouser) - and I > have a second CPU (same source/batch) I've also tried. I've replaced every > other IC except the 74LS541's (I only have a single spare - which I've > substituted for every position). I've resoldered ever connection. I've > tried both 28C64 and 27C64's for the monitor. > > - Gary > > -- > You received this message because you are subscribed to the Google Groups > "N8VEM-S100" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > > -- > You received this message because you are subscribed to the Google Groups > "N8VEM-S100" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
