Any ideas what to go after for a blink code 1, when the 6532's are good unless they are fake's or not compatible.  Trying to use rockwell R6532AP's

ideas?

Does anyone still repair these?

Thanks

Quote from: maraud on March 10, 2011, 08:37 AM
Great news!  Was it a 27256 or a 27512 that you needed?  I can't remember the size of the BASIC ROM.

27256 took care of it.

 :)Repaired    burning and swapping u34 fixed it up.

It appears that the chip for basic 7.0 in my 128D has both the high and low in one prom part number basic.318022-02.bin that equals 318018-02+318019-02 this would explain the break I got in the middle when only the low code was present from the swap and not the high.   

I have download a bin file for the basic.318022-02.bin  any idea what type prom size this burns onto?  the factory chip is a MOS and not a prom.  I am thinking it is a 27_256 but looking for opinions.

Thanks

Hello trying to get a c128D up and going again.  It will boot to c64 mode,  the cart does work.   ON power up I get a boarder but no text just blank screen after a flash page of garbage.  From ray's repair docs I suspect.
U33       318018-02  C128 BASIC LO ROM
     No BASIC startup screen in 128 mode only. Computer goes into
"monitor" mode.

U34       318019-02  C128 BASIC HI ROM
     Blank screen with border at 128 mode startup. Lines or "garbage"
inside border.

   I have a donor c128 but the do the IC locations equal the same spot on a 128D board?  The chip #s are different between the two.   I did swap U34 as the board layout and trace that i tested was exact;  this gave me a "break error" and some ML code (?) following it when booted instead of the blank screen.  I think i am in the right area, suggestions or any info please.  Are there bin files and what type prom if they exist could be used to replace these. 

I have another working 128D, but dont want to chip swap it with this one as there is some hum in screen and audio of the broken one and I don't want to wreck anything know good.  I'll pick up caps and repair supply in the AM>

Thanks

John

I'm in grand rapids.  I'll fire the up soon.  I have a 8032 and 4016 (upgraded to an 8032 iirc) in the basement.  If there both working I would sell off one of them. 

 

I was able to get this working tonight had some difficulty flashing the device.  I had and outdated avrprog.exe upgraded and it flashed fine;  however if I put anymore that 25 files on the SD card it errors out and locks up the uiec if I try to load them.  It gives a file not found for anything in the list after the 25th.  Is this a limitation of the interface?  Is there a way to setup directories or use some sort of image file?  I use jiffydos on the C64 side so I don't know many of the long string commands. Thanks for your software it is a huge improvement over tape, and having to repair my drives. 

That sounds pretty interesting had never heard of that one....

Now I need to find that super explode cart looks like I just missed one on ebay and i believe  the one listed on ioffer was the same one

Still looking for my computer eyes,  missing it a set of paddles and a datasette unit from my youth.  Hopefully it will turn up.  How do the two compare?

I have (2) 128DCR's  on the way with 1571's.  Been trying to figure out my options for a monitor.  Leaning towards that little ebay device and mod for the extra colors.

What type input does a monitor need for the 128 native.  I have several broadcast RGB monitors, but have no idea what the c128 really wants to connect to.

Sorry for the basic ? but just getting started in the 128 realm.  Any good software suggestions?

Thanks

John

Any ideas as to total production with the Silver badge label? 

Lifted from  http://moogle-tech.com/blog/?tag=computers  I just got one and was curious as well,  this turned up from a buddy that works on MESS.


Take A Byte
Sunday, November 30th, 2008
I recently purchased a Commodore 64 off of Craigslist. One of the interesting things that came with it was a Video Byte II cartridge - a still, black-and-white frame grabber that plugs into the User Port.

Fascinated, I cracked open the case and found it to be rather devoid of parts - only four ICS: An LM324N (quad op-amp), a CD4066BCN (quad bilateral switch), and two 555 timers.  This was even more impressive, since it uses no ASICs, FPGAs, or anything else traditionally associated with video capturing.  In addition to the ICs, there were some transistors, resistors and capacitors, of course.  After completing a partial schematic of the device based on PCB scans, I decided to try a different tack: reverse-engineering the software itself by using VICE.

It turned out to be a very simple loop utilizing CIA #2’s ability to time the duration that CNT2 is held high on the User Port by decrementing Timer B each time Timer A underflows. The loop reads pixels in column-by-column by performing a dummy read off of CIA #2 Data Port B, which in turn causes a pulse on the /PC2 handshaking line. This triggers the Video Byte 2 to pull CNT2 high for a duration corresponding to the brightness level of the upcoming pixel. The loop then checks the value in Timer B; 0xDC is Dark Gray, 0xDA is Medium Gray, 0xD8 is Light Gray, and 0xD6 is White.

Simple. Elegant.

My changes to VICE’s source tree are available on request; my implementation is currently highly deficient in that it simply reads in raw pixel data from an image in a hard-coded path with a hard-coded name. However, the actual CIA-related changes and functionality should be there. For what it’s worth, VICE did not actually have proper support for the Timer B mode that is used by the Video Byte. Mode 0×60 should decrement Timer B when Timer A underflows only if the CNT line (attached to the User Port) is held high; by contrast, VICE treats it the same as mode 0×40, which always decrements Timer B when Timer A underflows.

Looking for some IEEE-488 cables to connect the PET 8032 to an 8250 drive, or if anyone knows where they can be bought.  Thanks


John

Could someone confirm that I can use TMS2532 and TMS2516's to replace 2332 Rom and 2316 that were use factory in the PET?  I know there is a slight pin difference in the 2532's but i believe they still work as a drop in. 

Thanks

John

I believe Nils is working on a new revision that will include some of this and more,  eth and LCD.  However if my understanding is correct his efforts are currently on David65.  Perhaps he will chime in here.

I think there were several different brands available,  looking to purchase an interface card to allow my 8250/8050 drives to be connected to a C64.

Also may be interested in a superpet if anyone has one available.  Would be looking to pick it up at the C4expo to avoid shipping costs, but might consider shipping as well.

If you have anything please, PM or email.  Thanks

This would be very nice,  does he keep an active development page somewhere?

The schematics I have do not list the voltages off the main transformer.  Does anyone know the voltages that are on the input to the board feeding the bridges and reg's?  Trying to verify that the transformer is good.  Thanks