svhovater

link please?

Good tip - thanks. Part number CO61793

where did you find the replacement connector for the motherboard?

Well now.. I loaded InterLisp65 v 2.1 (under OS/A+) and (stick 0) is returning the right value.

hi folks Working with interlisp/65 v2.5, and was checking out functionality. I thought it would be interesting to write something that would read the position of joystick 0. Unfortunately, when I enter (stick 0) I get a string of atascii back instead of the number I expected. So.. if we invoke (car (unpack (stick 0))) we get the first character of the atascii string. If I move the joystick, and execute again, I get a different character. I don't see a way to turn that character into a number. ideas?

I'd love to get one! Hope we can work something out.

Well.. pulled out the jeweler's loupe and inspected the soldering job I did on the CPU socket. Apparently, using my old bulb-solder sucker, I had nicked a trace. Repaired. Side3 loader working now. Egads. What a klutz. Thanks all for the suggestions.

It appears that EXTSEL on Freddie is tied to +5 - which makes sense, since there's no expansion port. Odd thing is that the Side3 worked as both "disk" and loader, before this upgrade. I'm concluding that EXTSEL isn't needed to support Side3. (snip) EXTSEL from Freddie to the 64KB SRAM unit removed. Behavior remains. I'll be looking at CPU's next, per Beeblebrox's suggestion.

already have a 74F08 installed.. I'm in New Hampshire, near Manchester.

I installed it this weekend in a 65XE. Machine has U1MB and SophiaII - and Side3. Prior to the installation, I kept getting machine lockups and garbage on the screen. I removed all the RAM chips, their resistors, and connected the EXTSEL and CASINH to Freddie pins 3 and 4. This resolved the lockup and garbage (I'm assuming it was a RAM issue), but trying to enter the Side3 loader (updated to latest firmware), I get black screen. The PBI disk functionality via U1MB is working. One thing at a time, I guess.

Following Chevymad's lead.. parts ordered. (DigiKey) thanks all!

Per the classification Beetle used in his post, mine is a "Type 2".

hi Larry I thought Best sells an entire replacement keyboard with mylar. Chevymad - yes, the ribbon cable broke from bending too many times. I've trimmed it back, and it's working but it's dodgey. Replacing the ribbon cable would be the best solution, in my opinion. Do you have a link handy for the thread you mentioned? thanks!

hi folks After too many removals, the mechanical keyboard on my 800xl has failed - some keys (like system reset) don't work. Looking on Best's site, they have replacement keyboards, but they have mylar. Mine doesn't. Any feel for whether the Best mylar-based keyboard would be a drop-in replacement? thanks, Steve

hi folks Interested in getting a copy of the ATR8000 CP/M bios that's rebuildable. (That is, execute movcpm, then recompile the bios to work at the new address. I want to add a bit of code..) thanks, Steve

Finally got back to this - I ran the xram test, and I didn't see any errors. Just for fun, I reflashed the U1MB to 3.10, and haven't seen the problem recur yet. Seems like a Schroedinger thing. When I am *trying* to reproduce the problem, it's rock solid. Sigh.

found xram 0.21

Hi Jon Xram ? Where? as to the problem - I put the U1MB in my 65XE, and that and the Side2 were magnificent. Unfortunately, the power LED doesn't work on that machine, and I neglected to power the machine down before I removed the Side2. Now, the Side2 mostly works - but the real problem comes in when I operate spartados X - from the U1MB. I have the settings to use the 1024 Rambo handler for the ram disk, but after awhile I type "DIR", and get a ton of "symbol undefined" errors. I noticed that when I use a different handler for the U1MB ram - say, the 256 or 320k handlers, I don't see the problem. Or haven't since. My working theory is that the side2 insertion/removal with power on did something to the memory that spartados is bankswitching. But I could just be totally full of beans, too. So - my first step is to "formally" test the extended ram. I'll hunt around for XRAM. Thanks for the tip.

Trying to track an issue. Diagnostics for U1MB, anyone? thanks Steve

I'd love to see a screenshot of DT80 working with Sophia2. If anyone has the combo.. thanks!

Going to need some drivers too. I assume that access will be via CP/M ? SWP at one point enabled the co-power to be used as a ramdisk under CP/M.

One of the easiest and most impactful mods I've done. Is there a way to reduce the black border? (Using dvi out) thanks!

Long shot, but.. I'm attempting to make some changes to the ATR8000 bios. My starting point is the ATR8000 bios (attached), which offers no real changes but is meant as an exercise in rebuilding the BIOS before I start making the real changes. The process I'm following is to first generate a custom CP/M using configure -14 and write the tracks to disk, then boot from that disk. We find that the BIOS starts at DA00h following the configuration. Then, I org the BIOS source at C400h, and compile using SLR180/hf to produce a hex file and a listing. And that's where the fun begins. When I compare the compiled bios to what should be the running bios, I see that the running bios matches, and then all of a sudden, we see the compilation listing: 238 ; 239 ; 240 ; 241 ; ... cold boot entry point ... 242 ; 243 DA59 BOOT: 244 DA59 2A F019 LD HL,(MONITOR+24+1) 245 DA5C 22 F7EB LD (REINIT+1),HL ;set address for console re-init 246 DA5F 21 F7EA LD HL,REINIT ;patch new address in monitor vector 247 DA62 22 F019 LD (MONITOR+24+1),HL 248 249 DA65 21 DA83 LD HL,BOOTAB 250 DA68 CD DB08 CALL MOVE ;store constants from boot init table 251 252 DA6B 01 0DA3 LD BC,10100011B OR (13 SHL 253 DA6C IBAUD EQU $-2 ;initial baudrate for rs232 port 254 DA6E CD F70C CALL OVRLAY+12 ;go program rs232 port 255 256 DA71 21 F880 LD HL,DIRBUF 257 DA74 CD DF48 CALL PMSG ;display signon message in temp buffer 258 259 DA77 21 DB16 LD HL,DUMMY 260 DA7A 22 DA01 LD (CBIOS+1),HL ;close the door on the way out 261 DA7D 21 C400 LD HL,CCP 262 DA80 E5 PUSH HL ;put ccp entry address onto stach 263 DA81 18 5B JR GOCPM 264 ; However, the running bios matches up to DA6E, but then seems to do something quite different. DA71 96 SUB M DA72 F3 DI DA73 86 ADD M DA74 F3 DI DA75 312E9A LXI SP,9A2E DA78 F202F3 JP F302 DA7B 00 NOP DA7C 00 NOP DA7D EDF7 ??=EDF7 DA7F 19 DAD D DA80 F1 POP PSW DA81 21DF00 LXI H,00DF DA84 FD ??=FD DA85 0C INR C DA86 DF RST 3 DA87 86 ADD M DA88 DE8D SBI 8D DA8A DD ??=DD DA8B 51 MOV D,C DA8C DA00FD JC FD00 DA8F 3B DCX SP So, to make a long story short, if you have an ATR8000 bios (4-84), I'd love to see it to compare with the attached. And if you were an ATR8000 owner with a hard-disk, I'd *really* love to see the bios. thanks!! Steve ABIOS.z80

Could use two for XL/XE. thanks!

I can vouch for the cable from 8bit classics - good heavy duty quality cable.