mr-atari

MyIDE_only is a term I gave to my code. It means that the IRQ-routines (disk-IO) of the resident OS is patched to support MyIDE (any version), instead of installing a complete (soft) OS. All code needed to do this is stored in the SRAM of the MyIDE-cartridge. Making it compatible with software that uses RAM at $C000+ and other BIOS specific entries.

The MyIDE-II keyhole is accessible using the control-status of the cartridge. It's perfectly emulated in Altirra. Keyhole ranges $D580-$D5FF. Other interesting feature is $D540-$D57F that mirrors $D500 the IDE-data register. IDE registers are $D500-$D507 (also the secondary registers are accessible here) $D508 - "Left" Cartridge Page Register $D50A - "Right" Cartridge Page Register $D50C - Keyhole Page Register High-Byte $D50D - Keyhole Page Register Low-Byte $D50E - COMPACTFLASH CONTROL REGISTER $D50F - Control Register I have a similar information about SIDE.

Sure. Altirra and 130xe with myide-2. But since I suck at playing the game, I can only test the first 3 screen then I die... No idea about side, I don't own one. But since it's a copy of myide, I'm sure someone can cook up a version for it.

@rensoup asked me to include the readme file. Since I can not edit my first post anymore, here it is. readme.txt

I didn't know pop was only loaded from atarimax, sic! and mega. Then the cartridge is disabled. I was under the impression levels were loaded from cartridge and the game ran from cartridge (being ON). For example 8k right for switching and 8k left for fixed code, since sic! and mega are 16k. But then 8mbit atarimax is a 8k left cartridge. Don't think a XE cartridge can be switched off, so no. No comments on my pop myide2 topic and having 10 downloads, so I guess it works ok?

Complete misunderstanding about sram being used as extended memory v.s. how to load the game from a different bank-switched cartridges. Look here for trying the MyIDE-2 version.

After some discussion with ressoup, I decided to hack my way into the atarimax flashfile. So here is my first attempt, after some sleepless nights, how to modify the code..... The file can be loaded with the standard atarimax-fat-loader on your MyIDE-2 cartridge. Basically the "rom" image is used for loading the game and then disabled. To make it work, I needed to change the atarimax-flash bank-switching to MyIDE-2 bank-switching. (see switch-code) So, please download the game and try if it works. Note: You still need a 128k atari to run pop. And I have no idea how frame 4 popped up.... PoP_Atarimax to MYIDE2.rom switch-code.txt

Strange to find a continuing here instead of the original forum/post. I am not often on AA, just for the sci-fi challenge and altirra updates.... Anyhow, yes, it is possible to load pop into sram of myide-2. Then switch to read-only sram and then execute cartridge style. I know the bank-sequence and what registers to use. So if the makers of pop can contact me, preferable my email, I help them out.

I did something like that for LiteDOS. Called it REMU (Rom Emulation), it loads standard 16k or 8k cartridges and (tries) to run it. http://www.mr-atari.com/Mr.Atari/LiteDOS/ Not a car to xex program, but a rom loader. Grtz!

The case is textured, but someone made it smooth and painted it white on the top. I have removed the paint, when I got it. It wiped away with I.P.A. so I did the whole top. I found another sticker under the cartridge-plastic insert. "FCO" The wires on the back, go to the internal speaker. There is a small transistor connected to the channel switch (speaker on/off), channel select is disabled (trace cut). @bob1200xl This is the unit I used for your 14XL I need to fix the heatsink.... @x=usr(1536) I had a 1400XL and 1450 XLD for repairs some years back. The 1450 (short PCB) had a wire-board for the PPD. Awesome machine. Great voice when you run the Selftest (1400 also). I was very sad when I returned them to the owners.... Later!

I have this 1200XL in my collection, reading this thread, perhaps anyone can shed some any info on this unit? Eproms, V10 SW16 LO / HI Flexi-foil cartridge connector Modified with a keyboard click speaker Reset push-button above ON/OFF switch, no wires.... No label on the back Big Cap reads "IST PASS" Grtz, Sijmen.

@Marius Bug, confirmed and only on the first disk you copy. Every other disk is detected OK, until you powerup again or re-enter image-mode. MyIDE-][, bug not present, plus, I show the detected density. So somewhere between 4.8 -> 4.9 -> MyBIOS-RAM/ROM I fixed it.... (Picture MyIDE-][ MyBIOS-RAM, waiting for "Y", copy to slot $002A "jaja") You are right about room, I have 8 bytes or so left for the image-menu. So I have a thought about this. Will be after X-mas. Merry X-mas to you all! [EDIT] 4.9 for MyIDE-][ it is fixed too. [EDIT-2] 4.8 for MyIDE-][ it is fixed too..... So this is a MyIDE-I only....

I checked the code, same as MyIDE-][, and no reports either. I do status of D1, if error, exit. If OK, read status-byte, negative=MD, bit4 = DD, otherwise SD Then copy 720 sectors or 1040 (MD). Nothing wrong there....

2nd thing that came to my mind. Hacking the internal MyIDE with some switches. The flash is 128k in size and only 32k (MyBIOS + recovery) are used. In recovery the IDE is disabled. Giving room to 3 more sets of OS + recovery. Anyone has a schematic of the layout? I found that A14 and A15 are "free" and A16 is the recovery select. But I have to measure how/where these traces go to, pulled up/down etc.

Yes, that image-handling is on my to-do list, since 4.8.0B is out now..... Compared to the latest MyIDE-][ version, pfff, I am missing a lot of functionality. I was also thinking of adding 2 more densities, "small S" and 'small D" for disks with no boundary. This is a work-around to store a 16mb DD disk or to use all sectors available to an image. Now, setting S/D or M, limits the disk to 720 or 1040 sectors. (I could add Q and small Q for quad density, if needed) So from SIO to MyIDE the density is read wrong? Hmmm, interesting, never found that bug. Did you report that to me? Room is limited on this MyIDE, so I have to see. @Marius Yes, you can replace any standard 8k ROM with something else. The label-text is found in the first 8k, a hex-editor will help you here. Later!

For anyone who wan't to know, here is how I filled the Atarimax banks: Note the OSS-cartridges of 24k can NOT be moved, due to the patched banking-scheme. The other ROM's can be moved inside, but must be correctly pointed to in the menu. Atarimax Menu is on bank 0 ($D520) Altirra Basic 1.58 is on bank 1 ($D521) Assembler /|\ is on bank 2 ($D522) Basic XL (OSS) starts on bank 3 ($D523) MyBIOS 4.8.0B starts on bank 6 ($D526) MAC 65 (OSS) starts on bank 10 ($D52A) Action! (OSS) starts on bank 13 ($D52D)

Yes, it will work, but you have to modify the atarimax-cartridge image. Or any other cartridge in that respect. If I remember correctly (it's been 15 years) there is a bank-ID stored on the lower 4k page (on $AFFF). Original banks are called M091, this is the 4k sequence in the ROM, "Main 4k at $B000-$BFFF, bank 0 at $A000-AFFF, bank 9 at $A000-AFFF, bank 1 at $A000-AFFF" (Using bit A3,A0 of the address if written to $D5xx, %0xx0,%0xx1,%1xx0,%1xx1) Write to %1xx0 or $D508 switches the OSS off. Change this ID to the value needed to switch the new cartridge. To replace the 24k BASIC-XL these ID's are: $23,$24,$25 Switching the Atarimax cartridge off is $30. Atarimax banks are 8k in size and not 4k+4k, so you have to create an ROM-file that is 3 banks of 8k=24k With bank M as upper 4k and 0,9,1 as lower 4k. Sequence of these 4k segments are 0M9M1M So far so good? Basic-XL uses banks 3,4,5 in this MyIDE+1Mb cartridge image. So you have to replace this 24k with your image. The text Basic XL (OSS) can be found in the first 8k of the image. Just change it to XE, there is no checksum Enjoy your hacking.

Ok, I have implemented the MyIDE-][ routine. This only effects the MyBIOS loaded from flash. It goes like this: -During installation, look for the original Atari CCE-routine in C000-D000 -That starts with LDA #$00 TAX CLC ADC -If found, copy this address into the MyBIOS CCE-routine. -If not found, this code is unmodified. MyBIOS CCE-routine: Push code to stack. Execute code from stack. Code: Wait for VCOUNT=0, switch to original OS, JSR CCE, switch to MyBIOS, CMP CHKSUM/RTS Where JSR CCE is the modified code. If the original OS has no CCE, it is LDA CHKSUM, meaning this code always returns true when executed. https://www.atarimax.com/flashcart/forum/viewtopic.php?p=13936#p13936 Grtz, Sijmen

Short update, nah it's still not working correctly. If the sum of BFF0-C000 is lower then a certain value it still cold-starts the machine. Mac65/DDT does this. So do not press RESET, use shift+control+tab then R instead. In the meantime, I will try and implement the CCE-routine I apparently have re-written (again) for MyIDE-][. With a remark that the previous routine didn't work.... Back later, give me 48 hours

Long story short: During loading of the MyBIOS, I do a sum of C000-C0F0 of the internal OS and store this value as offset in the freshly loaded MyBIOS CCE-routine. Then during any cartridge check, MyBIOS sums BFF0-C000 and add this offset. Thus reproducing the original bug of Atari. So far so good, then for some unknown reason I do an extra ADC #00 to add the carry in the end. Testing revealed that all sums of any original OS were 1 short. So I basically removed this ADC #00 with NOP NOP. Now, pressing Reset, does not kill MyBIOS, does not wipe memory and keeps IDE-access. Also replaced the 8k ATB 1.57 with 1.58 https://www.atarimax.com/flashcart/forum/viewtopic.php?p=13933#p13933 Grtz, Sijmen.

Yes, I saw that. An update is tomorrow. Also a fix for pressing the reset key. Somehow that protection was broken.

Tested and uploaded to the forum. https://www.atarimax.com/flashcart/forum/viewtopic.php?p=13932#p13932 Larry: "There is a small glitch in Action! where you have to go to the monitor twice to get it to work correctly. The first time, it will show error 0, but it still works. I'm pretty sure this small issue has always been there in these emulated versions. Once you go the second time, it then functions perfectly. I wouldn't give it a second thought."

Coming soon, currently testing 123... Since BASIC XE does not works from a soft-OS, it's now Basic XL. Also swapped Basic C (atari) with ATBasic 1.57 Together with the FMP (FastMathPack), the basic versions are nice and fast ?

Ah yes, I forgot, Basic XE switches back to the Atari BIOS, crashing the system. But as stand alone cartridge it works ok. It even works on a system with internal MyIDE (not using the external MyIDE).

And here is the update for 4.8.0A for the internal MyIDE (or homebrew internal MyIDE). You need to run SETUP once to install the menus on the IDE media. Flasher for the kit, -RI for your eprom-burner (16k eprom 27128) https://www.atarimax.com/flashcart/forum/viewtopic.php?p=13930#p13930 Grtz, Sijmen.