Re: [ql-users] recursive delete
In a message dated 29/04/02 23:30:35 GMT Daylight Time, [EMAIL PROTECTED] writes: Don't forget we already have one trashcan, that programmed on Qubide 2 ROMs. And that one had serious problems mainly due to the way that QDOS and SMSQ/E handled thing like MOVE. Beware if you are using it. Rich Mellor knows more about this than I do. Roy is right - the trashcan built into the QuBide 2 ROMs does not appear at all safe. It appears the problem mainly occurs when a program overwrites an existing file - the trashcan sees the previous one as deleted and tries to store it in the trashcan, but instead seems to grab a pointer to the new file (there is no old one to copy to the trashcan, as overwrite was used instead of delete). As a result, you remove this one from the trashcan and hey presto! your original file either no longer exists or is corrupted!! As a result, I gave in trying to use the trashcan feature a long time ago. Rich Mellor RWAP Software 7 Common Road, Kinsley, Pontefract, West Yorkshire, WF9 5JR TEL: 01977 614299 http://hometown.aol.co.uk/rwapsoftware
[ql-users] Old Sinclair Thermal Printer
I have one of the old ZX Printers (ahhh... fond memories of a gentle smell of burning)... Does anyone have a spare spool which went inside the printer paper to attach it to the printer?? Someone must have one knocking about somewhere - Tony?? Rich Mellor RWAP Software 7 Common Road, Kinsley, Pontefract, West Yorkshire, WF9 5JR TEL: 01977 614299 http://hometown.aol.co.uk/rwapsoftware
[ql-users] memory expansion standard ql
Does anyone know how to upgrade the memory of a standard (classic) ql ? I have searched the net but i didn't find a circuit or anything. Are there no do it yourself circuits available ? Anyone got an idea ? Regards, Henk Verbeek
Re: [ql-users] memory expansion standard ql
Yes, it can be done! But, the details involve knowledge which are above-my-pay-grade ... this exercise was successfully done to one of my QLs about 10+ years ago ... Briefly: * you will want to first de-solder the chips! * install sockets * change the chips on the spider daughterboard (i.e., create a new daughter board with the proper chips). On Tue, 30 Apr 2002 23:01:32 +0200 henk verbeek [EMAIL PROTECTED] writes: Does anyone know how to upgrade the memory of a standard (classic) ql ? I have searched the net but i didn't find a circuit or anything. Are there no do it yourself circuits available ? Anyone got an idea ? Regards, Henk Verbeek GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: http://dl.www.juno.com/get/web/.
Re: [ql-users] memory expansion standard ql
On 30/04/02 at 23:01 henk verbeek wrote: Does anyone know how to upgrade the memory of a standard (classic) ql ? I have searched the net but i didn't find a circuit or anything. Are there no do it yourself circuits available ? Done it many times in many ways. By far the simplest is to find a 628512 (aka 614000) static RAM chip, usually comes in a 32-pin surface mount package but regular DIP 32 is also available. This is 0.5MB in a single very low power chip. In addition, you need two 100nf capacitors, one 74HC153 logic chip and one 1N4148 diode. Here is the connection (use fixed width font) 74HC153 +--\__/--+ GND -|1 16|== +5V A19*-|2 15|- GND +5V -|3 14|- A18* DSL*--o--|4 13|- GND +--|5 12|--o-- +5V +5V -|6 11|--+ RAM(A) --|7 10|- GND GND ==|8 9|--||- DSMCL* ++ A K +--\__/--+ A18* |1 32|== Vcc A16* |2 31|- A15* A14* |3 30|- A17* A12* |4 29|- RDWL* A7* |5 28|- A13* A6* |6 27|- A8* A5* |7 26|- A9* A4* |8 25|- A11* A3* |9 24|- RAM(A) A2* |1023|- A10* A1* |1122|- RAM(A) A0* |1221| D7* D0* ---|1320| D6* D1* ---|1419| D5* D2* ---|1518| D4* GND ==|1617| D3* ++ * - signals from the expansion port, all but DSMCL can be found on the 68008 cpu, all but DSMC, DSL, RDWL, A19, 18, 17, 16 can be found on the ROM slot or either ROM socket. The ROM sockets have the advantage of having the correct pinout if the bottom of the chip is alligned with the bottom of the socket (socket pin 14 goes to chip pin 16), for all pins except RAM pin 3, 22, 24, 29 and 30. Here is the ROM chip socket for comparison (both sockets are wired the same): +--\__/--+ +5V |1 28|== +5V A12* |2 27|- A14* A7* |3 26|- A13* A6* |4 25|- A8* A5* |5 24|- A9* A4* |6 23|- A11* A3* |7 22|- ROMOEH* A2* |8 21|- A10* A1* |9 20|- A15* A0* |1019| D7* D0* ---|1118| D6* D1* ---|1217| D5* D2* ---|1316| D4* GND ==|1415| D3* ++ If you want to put this RAM expansion into one of the ROM chip sockets (plus the few extra wires you need), you can take both ROMs and put them 'piggyback' one onto the other, carefully solder the pins together (do this with pins facing up so solder does not go onto the pins of the chip that will plug into the socket), and plug the combination into any one of the two ROM sockets. 100nF capacitors go between +5V and GND pins on 74HC153 (pins 8 and 16) and on RAM chip (pins 16 and 32). RAM(A) points are all tied together, i.e. pin 7 on 74HC153 goes to pin 24 and pin 22 or RAM chip. The whole thing uses negligible amounts of current and you can 'steal' the +5V off of pins 16 on the 74LS275 multiplexers or pin 20 of the 74LS245 buffer ship. The RAM is zero-wait and will go as fast as the CPU can go, about twice as fast as the built-in 128k. To make things easyer to connect, you can connect the address lines (A??) and data lines (D??) to the chip in any order, as long as you never mix address and data. 628512 can sometimes be found on older hard drives from WD and Quantum, 820M or 1-2G capacity, normally near the IDE connector. They will be surface mount as a rule. With these, one has to be carefull because they come either in the normal case (pinout as above) or the 'reverse bent' case with different markings (left and right side of the pinout are changed around). A variation of this circuit is possible where it is on a small piece of printed circuit that plugs into the CPU socket, then the CPU itself plugs onto that. With some more logic, more RAM chips and a 68008FN CPU (in a PLCC 52 case instead of the standard DIP48) it's possible to add almost 4M of RAM but it will only work with some JS (and JS based) ROMs and Minerva. Nasta
Re: [ql-users] memory expansion standard ql
Can't believe I made an error in something that simple... but I did. Correction: Needs one more 1N4148 diode. RAM(A) K||A DTACKL* There :-) Nasta
Re: [ql-users] Di-ren Keyboard interface
On Mon, 29 Apr 2002 [EMAIL PROTECTED] wrote: Does anyone have a copy of the manual and disk supplied with the di-ren keyboard interface they could let me have please (photocopy or disk copy of manual acceptable). Is this anything to do with the Di-Ren interface you're selling on eBay? :o) Dave
Re: [ql-users] memory expansion standard ql
ZN wrote: On 30/04/02 at 23:01 henk verbeek wrote: Does anyone know how to upgrade the memory of a standard (classic) ql ? I have searched the net but i didn't find a circuit or anything. Are there no do it yourself circuits available ? Done it many times in many ways. By far the simplest is to find a 628512 (aka 614000) static RAM chip, usually comes in a 32-pin surface mount package but regular DIP 32 is also available. This is 0.5MB in a single very low power chip. In addition, you need two 100nf capacitors, one 74HC153 logic chip and one 1N4148 diode. If you want to put this RAM expansion into one of the ROM chip sockets (plus the few extra wires you need), you can take both ROMs and put them 'piggyback' one onto the other, carefully solder the pins together (do this with pins facing up so solder does not go onto the pins of the chip that will plug into the socket), and plug the combination into any one of the two ROM sockets. It is quite possible that I still have a few built and ready to go, eprom adapter boards that place the entire ROM on one CMOS EPROM that you would just plug into your motherboard. That goes a long way towards freeing up both one of the ROM sockets and and at the same time, reduces the total power requirements a measurable amount. (runs cooler) The boards I have also provide a battery to hold clock time between power cycles, works most all the time. -- Paul Holmgren Hoosier Corps #33, L-6 2 57 300-C's in Indy
[ql-users] ROM versions
Hi all, What do you think would happen if you put JS ROMs in a US spec QL? Or JSU ROMs in a UK spec QL? Dave
Re: [ql-users] memory expansion standard ql
On Tue, 30 Apr 2002, paulholm wrote: The boards I have also provide a battery to hold clock time between power cycles, works most all the time. I'm interested in how that works. Do you have any details? Dave
