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Text File | 1996-04-11 | 17.2 KB | 351 lines

******************************************************************************* * * * AddZorro2slot * * * * Subtitle: " HOW I ADDED A 100 PIN ZORRO 2 SLOT (FOR A PICASSO II) * * TO MY A500, KEEPING INTACT THE 86 PIN EXPANSION PORT " * * 4/4/1996 * * * ******************************************************************************* Author My name is Gabriele Peterle, and I'm an informatic engineering student at the Padova university. Excuse me for my poor english but I learn it by myself; I hope you'll be able to understand. If you want to contact me for explanations or comments you can write to my e-mail address: ray@maya.dei.unipd.it or snail-mail: Gabriele Peterle viale dei Colli 10/a 37128 Verona ITALY Copyright and Distribution This project is freeware, even because I invented nothing; I only read the manuals and the A500 and A2000 schematics. You can send me whatever you want, just to tell me if you liked it or not. It can be distributed everywhere but please keep the archive intact. History I own my Amiga 500 since 1988. As the AGA Amigas were available I was not so excited. The specs was not so great compared to my system ( and compared to the "soon upcoming" AAA chipset), so I decided to wait. You all know what happened a couple of years later .... Now I'm here waiting for a PPC Amiga, but in the meanwhile I added to my trusty 500 the only thing it missed: 24 bit graphic ! There are a lot of graphics boards for A2000, but none for A500, so I compared the schematics of the two systems and I added a full (?) 100 pin Zorro2 slot to the 86 pin expansion port of the A500 (NOTE: This hack allows to ADD a 100 pin Zorro2 slot keeping intact the 86 pin expansion port !!!!). Limits My system consists of: Amiga 500, motherboard rev.5 (originally with kickstart 1.2) A501 0.5 MB expansion memory in the trapdoor 8375 Agnus (1 MB chip ram) ROM 2.04 (soon 3.1) Hardital Big Bang accelerating board with 68030/882 33 MHz, 8 MB 32bit FAST RAM, inserted in the 68000 socket. Hardital Synthesis SCSI controller with 80+170 MB Quantum Harddisks inserted in the 86 pin expansion port ( NOT DMA ) Picasso II graphic board in the added 100 pin Zorro2 slot. This system works great since over 1 month. If I'm not wrong the A1000 has the same 86 pin expansion port so this hack can be adapted to work with this too. I give NO WARRANTY this hack will work with other configurations; you had to try by yourself and at YOUR OWN RISK !!! If you do something wrong the consequences are unpredictable: maybe your Amiga won't work and removing the hack will solve the problem, but it's possible that you BLOW UP your computer and I have no responsibility !!!! I chose a Picasso II, so this project is realized around it. This hack uses NO EXTRAS CHIPS (in particular there's no Buster), thus this slot can work with other than graphics boards but I think only one board can be DMA (I have some doubts it will work with GVP boards, because they use DMA). Also a Firecracker24 worked good with this hack. Theoric realization With reference to the included pic, the straight lines are really used by my Picasso II board, dotted lines instead are possible links but I didn't tested it. The description is referred to my configuration; you change my SCSI controller with your device inserted in the 86 pin expansion port, and my Picasso II with the board you want to insert into the new slot. Here I list the 100 pin Zorro 2 slot signals on the left, and the corriponding signal taken from the A500 on the right. If in your user manual there are the schemes, it can be useful to give it a look sometimes. Better if you can compare the A2000 and A500 schemes. There are some references to another hack I found on Aminet called 2000slot.lha which can be found in the hard/hack directory (but this hack only allow to _transform_ the 86 pin expansion slot to a 100 pin Zorro 2 slot); anyway it can be useful to give it a look. ZORRO 2 signals (the initial number Where to find it on A500 (the initial is the pin number on the 100 pin number is the pin number on the 86 pin Zorro slot) expansion port) 1 GND 1 GND 2 GND 2 GND 3 GND 3 GND 4 GND 4 GND 5 +5 V 5 +5 V 6 +5 V 6 +5 V 7 LOCAL_OWN* ??? (not used by Picasso) This is an output signal to the Buster chip probably used for DMA. 8 -5 V Some power supply (not used by Picasso) This voltage is not present in the A500 power supply !!! In another hack (2000slot.lha) the author used the pin #8 of the expansion port but this gives -12 V !!!!! Watch out !!!! 9 SLAVEn* ??? (used by Picasso, but I leave it not connected). This is an output signal to the Buster chip probably used for DMA. 10 +12 V 10 +12 V 11 CONFIG_OUT* this signal must go as CONFIG_IN* of the next board (I connected this to pin 12 of my SCSI controller inserted in the expansion port). See pic. 12 CONFIG_IN* 12 CONFIG* NOTE: this signal MUST go only to one board (the Picasso) so you MUST break the connection between the #12 pin of the expansion port and the #12 pin of the board inserted into it. See pic. 13 GND 13 GND 14 C3* 14 C3* (not used by Picasso) 15 CDACB 15 CDAC (not used by Picasso) 16 C1* 16 C1* (not used by Picasso) 17 OVR* 17 OVR* (not used by Picasso) 18 XRDY 18 XRDY 19 INT2* 19 INT2* (not used by Picasso) 20 -12 V 8 -12 V (not used by Picasso) 21 BA5 21 A5 22 INT6* 22 INT6* (not used by Picasso) 23 BA6 23 A6 24 BA4 24 A4 25 GND 25 GND 26 BA3 26 A3 27 BA2 27 A2 28 BA7 28 A7 29 BA1 29 A1 30 BA8 30 A8 31 BFC0 31 FC0 (not used by Picasso) 32 BA9 32 A9 33 BFC1 33 FC1 (not used by Picasso) 34 BA10 34 A10 35 BFC2 35 FC2 (not used by Picasso) 36 BA11 36 A11 37 GND 37 GND 38 BA12 38 A12 39 BA13 39 A13 40 EINT7* 40 IPL0* (not used by Picasso) 41 BA14 41 A14 42 EINT5* 42 IPL1* (not used by Picasso) 43 BA15 43 A15 44 EINT4* 44 IPL2* (not used by Picasso) 45 BA16 45 A16 46 BEER* 46 BEER* 47 BA17 47 A17 48 VPA* 48 VPA* (not used by Picasso) 49 GND 49 GND 50 E 50 E (not used by Picasso) 51 VMA* 51 VMA* (not used by Picasso) 52 BA18 52 A18 53 RST* 53 RST* (not used by Picasso) 54 BA19 54 A19 55 HLT* 55 HLT* (not used by Picasso) 56 BA20 56 A20 57 BA22 57 A22 58 BA21 58 A21 59 BA23 59 A23 60 BRn* These 2 signals |--->60 BR* (not used by Picasso) 61 GND are used if the | 61 GND 62 BGACK* board uses DMA | 62 BGACK* (not used by Picasso) 63 BD15 (Direct Memory | 63 D15 64 BGn* Access) |--->64 BG* (not used by Picasso) 65 BD14 65 D14 66 DTACK* 66 DTACK* (not used by Picasso) 67 BD13 67 D13 68 READ 68 R/w* 69 BD12 69 D12 70 BLDS* 70 LDS* 71 BD11 71 D11 72 BUDS* 72 UDS* 73 GND 73 GND 74 BAS* 74 AS* 75 BD0 75 D0 76 BD10 76 D10 77 BD1 77 D1 78 BD9 78 D9 79 BD2 79 D2 80 BD8 80 D8 81 BD3 81 D3 82 BD7 82 D7 83 BD4 83 D4 84 BD6 84 D6 85 GND 85 GND 86 BD5 86 D5 87 GND 85 GND 88 GND 85 GND 89 GND 85 GND 90 GND 85 GND 91 GND 85 GND 92 7 MHz 68000 pin #15 (not used by Picasso) 93 DOE ??? (not used by Picasso) I think this signal is a delayed AS* (pin #74). The author of 2000slot used +5 V (pin #5 or #6). I think it is used by DMA boards 94 BUSRST* I first tried the RST* signal (pin #53) It worked fine in 68000 mode, but I had big troubles in 68030 mode (yellow screen with flashing led). I solved all my problems using the A500 RESET* signal. I took this from the #11 pin of the U37 component of my rev.5 motherboard (it's a 74LS32 (NAND gates)) It is located under the internal floppy drive. If in your motherboard isn't there such a component, you can try to follow the RST* signal track and see if it passes through some AND/NAND/OR... gate(s) and exits unchanged (AND with +5v, or OR with GND, ...) and then use the output as BUSRST*. 95 GBG* 64 BG* (not used by Picasso) 96 EINT1* ??? (not used by Picasso) 97 not connected not connected 98 not connected not connected 99 GND 85 GND 100 GND 85 GND Almost all the links are taken (in parallel) directly from the 86 pin port, so you can solder a wire between the two corrisponding pins (one on the Amiga, the other on the new slot). The CONFIG_IN* and CONFIG_OUT* signals are connected "serially": the CONFIG_IN* from the 86 pin expansion port is connected to the Picasso's CONFIG_IN* pin; the CONFIG_OUT* signal from the Picasso is connected to the CONFIG_IN* of the board inserted in the 86 pin expansion port (e.g. my SCSI controller); Probably it's possible to change the config order (first the SCSI controller, then the Picasso) but my SCSI board has no CONFIG_OUT* signal. NOTE: it's important that the CONFIG_IN* of the 86 pin expansion port goes to only one board or you'll have auto-configuration conflicts !! The BUSRST* signal is taken from a 74LS32 chip on the A500 motherboard (under the internal floppy drive); the 68000 RST* signal makes there a NAND (with negated inputs) with 0, thus it exits unchanged but more stable (and a little delayed), and then goes to the #94 pin of the Zorro 2 slot. I tried, before, to use directly the RST* signal as BUSRST* but I had some conflicts between the Picasso and the accelerating board during the reset sequence (I think both boards tried to autoconfig itself in the same time and/or in the same addresses). Practical realization. I rate the realization quite simple if you are expert with soldering and testing electric circuits, quite hard (and dangerous for your Amiga) if you have no idea about what you're doing. You had to be very patient and make everything slowly with calm. NOTE: my project uses NO EXTRA CHIPS !!! It was impossible to me to found a 100 pin slot. I went to a computer reparation center and there I obtained, for free, a non-working 286 motherboard. I rip off from it 2 ISA (?) slots (62 pins each); I cut it in the way that they can be aligned to form one 100 pin slot (once the Picasso is inserted they won't move). Then I used a 50 wires flat-cable (two 9 cm long pieces, aligned; keep these cables as short as possible !) to make the connections between the 100 pin slot and the 86 pin expansion port. Note that the numer one pin on the A500 is to the rear of the upper side of the motherboard, but the number one pin of the 100 pin slot is (looking at it from above) to the rear of the left side. __________ _________ | | | | | _ | |_ #1 pin--->| |<---#2 _| SCSI |<--- #1 pin | | #1 pin-->| A500 controller | | | | expansion (upper | | | | port side) | | | | (upper | | | | side) _| | | |_ | #99--->|_|<---#100 | _________| |__________ 100 pin slot (top view) I made all the solders in the "vias" (holes which bring a track from a face to the other) on the SCSI board; the SCSI board is inserted, with its slot, in the expansion port and the flat cables bring the signals to the new Zorro slot. If you can't do like me, probably you must think about some other way to connect the boards; you can make a connector which duplicates the signal of the expansion port (from each pin start two wires, one for the 100 pin slot and the other for the SCSI controller). Other wires can be used for the BUSRST*, 7MHz, -5V,... connections. You have to make all the connections your new Zorro 2 board requires. CHECK EVERYTIME IF THE CONNECTION ARE NOT FAULTY AND THERE ARE NO SHORT CIRCUITS !!! Credits, thanks and greetings go to: My brother Leonardo, for his insistence which push me to conceive and realize this project. Dr. Segio Congiu, my Electronic Computers professor, who made me understand what I was doing. My friends Massimiliano Farnea, Zeno Montresor, Michele Bianchi and Eugenio Perinelli for their technical,theorical and moral support. Piergiorgio Sartor and Paolo Canali, ever ready and gentle to answer to my questions. Greetings to: The Amiga community of the Padova University, the worldwide Amiga community, the Amiga Report staff, the Amiga Technologies team, and everyone who knows me. Happy hacking!! Gabriele