Path: utzoo!attcan!uunet!lll-winken!ncis.llnl.gov!ncis!helios.ee.lbl.gov!nosc!ucsd!rutgers!bellcore!faline!thumper!gamma!mibte!jbh From: jbh@mibte.UUCP (James Harvey) Newsgroups: comp.sys.cbm Subject: Re: Another info request for old CBM computers Message-ID: <2748@mibte.UUCP> Date: 19 Jan 89 13:12:19 GMT References: <2035@iitmax.IIT.EDU> <448@csd4.milw.wisc.edu> Organization: Michigan Bell Telephone Company Lines: 66 In article <448@csd4.milw.wisc.edu>, jgreco@csd4.milw.wisc.edu (Joe Greco) writes: > In article <2035@iitmax.IIT.EDU> demoedf@iitmax.IIT.EDU (ed federmeyer) writes: >>Hello, I would like some information on some of the older CBM computers... >> >>I have a CBM 8096 computer and I need to know the following... >> >>1) How is the expanded 64K option used? I have the board installed and it >> still shows up as 38K (I think) free BASIC memory. > > I'm not too sure. I've heard alternating stories that it works like > the SuperPET's extra 64K and that it can be banked in and out (more > like the 64). In any case, it is not DIRECTLY usable and is probably > the most useful to machine language programmers. > >>2) How do I drive the onboard film speaker, besides printing CTRL-G? > > PRINT CHR$(7)? hehehe.... I don't have the info at my fingertips, > but you should be able to tweak the speaker line (or do something > equivalent) to play music. I used to have a program that did this. > If you want more info, e-mail me and maybe I can find some basic info. > >>3) Is there an IEEE to RS232 interface available? I would like to run a BBS >> message system with it, and I would like to hook up a cheap hayes compatible >> 300 baud RS-232 modem. > > Well, seeing as how the PET was designed to use an IEEE-based modem > (the CBM 8010... I even have one, hehe), you might try to find one of > those and find the modifications used to make it auto-answer. I know > that there ARE IEEE/RS232 interfaces available, but I'm not too sure > how well it would work for you. > >>ANY responses will be greatly appreciated! > > . JG > -- > jgreco@csd4.milw.wisc.edu Joe Greco at FidoNet 1:154/200 > USnail: 9905 W Montana Ave PunterNet Node 30 or 31 > West Allis, WI 53227-3329 "These aren't anybody's opinions." > Voice: 414/321-6184 Data: 414/321-9287 (Happy Hacker's BBS) I have one also. I also have two of the 64K memory expansion boards and SOMEWHERE there is a manual for them that describes how to do the banking. I remember you have to poke a memory location with a bank number and mabye another location to initiate the banking. I'll try to dig it up. This is best done from Machine Language of course. The speaker responds to a toggling of the "CB2" port in one of the interface chips. The old (Pre 8032) PETS frequently had a small amplifyer and speaker connected to this pin to do sound tricks. I hve programs SOMEWHERE to play music this way and they work on the 8032 film speaker. Sounds like there is a revival of interest in the PET lately. There have been a number of posts concerning the SuperPET on Comp.Sys.Amiga.Tech since Christmas. -- Jim Harvey | "Ask not for whom the bell Michigan Bell Telephone | tolls and you will only pay 29777 Telegraph | Station-to-Station rates." Southfield, Mich. 48034 | ulysses!gamma!mibte!jbh