xrbrevin

just for the record, there is a misnomer in the OP's question. Reverse basic is for 600/800XL and XE models only - option key is not used for the 400/800 models because basic is not built-in.

Inter-galactic? if so, 1 bloke should be green skinned! 🤢

even more "international" than before! 🙃

freddie could be worth a check, it handles RAM operations be careful when desoldering - the XE models are not as resilient as their predecessors due to manufacturing cost-cuts

yes good point. if the working XEGS then fails to operate, it will highlight a dud.

did you swap out the chips individually? its possible you have more than one culprit so it worth trying multiple substitutions at once

Hi @RobertB Many thanks for your reply. I also found Baby Berks .bin file that fits on a 27C128 EPROM. it goes in socket U25 and boots via the F1 key. The basic page text even changes to display: "GAME RUN ON KEY F1". it will keep me more amused until the parts arrive to build a tapuino. i went on to discover that very few games were released on cartridge, mostly text adventures. however i did find some pre-wrangled .bin files within: "openC16Cart" .zip file on the following site: https://c64.rulez.org/pub/plus4/Games/ in the .zip file there are several paired rom sets that use both the hi and lo sockets. im just erasing a couple of ICs now in order to try them out..

is it worth trying a replacement eprom? you may have to change the jumpers if your drive has a PROM as standard tho i suggest this because a USD modded 1050 also fails the RPM test of the 1050 diagnostic disk

For info, i got a response from the author about the 2x unidentified components: Q1 is 14.318 and D1 is 1N4148 You have to solder only one version of clock: QG1 or QG2 or 74HCU04 (with R8,C17, C19, C30, Q1), but not all of them because they all are doing the same. IC2 must be HCU version so maybe easier way will be just to buy 14.318 generator So generally: - option 1 of clock is to solder QG1 in smaller case - 14.318MHz - option 2 is to solder QG2 in bigger case - 14.318MHz - option 3 is to solder IC2 with R8, C17, C19, C20 and Q1 (14.318MHz) Depends of what parts will be easy to buy.

the head is ceramic so you can be quite vigorous when cleaning it!

Hi, i just got a plus/4 running (had a bad kernal and PLA) and im currently sunbrighting the keys does anyone know if the 2x app ROM slots can be re-purposed for anything more useful? i briefly spotted that jiffydos can occupy one, but i cant find the forum page now..! would this speed-up loading times on an SD2IEC device like it does on the C64? cheers!

nice job! 🙃 those diodes do get hot - hence why they are elevated away from the PCB, by design ive never measured the degrees of heat tho..

some software just wont load on a happy drive, even with it disabled USD has no such issues, can be cheaply made but it has less features than the happy (backup protected disks, nice big write buffer..) the best solution is to have one of each! 🧔

have you tested TIP110 voltages between ground?

ah apologies, i shouldnt scan-read so early in the morning!.. it seems you can test the motor control via voltages - see pic pin8 of LM2917 is 9.9v, then becomes 7.9v at TIP110 TIP110 - 7v & 12v (these are spin and stop voltages for motor header: J1 pin1) if these are in spec, it might be worth checking the associated components for open / closed circuit or out-of-spec failures do you have the field service m anual and sams computerfacts pdfs?

if the drive hasnt been used for a while, sometimes the spindle motor requires 'freeing up' with light oil and 'user direct rotation' have you checked for voltage signals at the motor pinout?

can you test the 800XL with another SIO peripheral? also test it daisy-chained thru the 1050 if poss

only switch the switches with the system off try these to ascertain RAM variations: SimCheck-1.0.xex Sysnfo16.atr SHORTEST.COM XRAM021.COM

👉Here

see here: its just out of shot on your image - far left-ish

The Atari does not use the audio signal like other 8-bit machines do. The Atari will not work with those generic tape players like sinclair, acorn, oric etc do - using mic and ear ports. Nor will it work with tzx/maxduino devices for the same reason. So maybe the .wav file method is not viable?

ive found that the pinout can vary despite the unit looking identical to the original

some AC adapters have a fuse inside - might be worth a check

im not familiar with WST 1050s but if it works ok for a while, it could be temperature related do you have one of those laser thermometers? if so, zap it around when the problem arises. it might help narrow down the cause 🔫

for XE, the current quick-fix for XE models is the "Simple XE Mod". here is the text and an image that shows the relevant components. Replace R204 with a 68ohm 1/4W resistor Replace R205 with an 820ohm 1/4W resistor Bridge/jump R116 Add a short 24AWG or larger wire from pin 8 or 9 of the 4050 (U20) to a ground point near the RF modulator ive done a few now and its my current favourite for XEs. the issue is that theree wasnt an industry standard for monitors back then and each manufacturer did things differently.